system-variable-reference.md

---
title: System Variable Reference
summary: A list of all TiDB system variables and their references in the documentation.
---

<!-- Note: The content of the reference lists in this file is organized in the following order:
- For non-release-notes docs, put them in ascending alphabetical order.
- For release notes docs, put them in descending order by version number.
- Put release notes docs after non-release-notes docs. -->

# System Variable Reference

This page lists all TiDB system variables and the documents that reference them in the documentation. You can view [System Variables](/system-variables.md) for more details of each variable.

## Variable reference

### allow_auto_random_explicit_insert

Referenced in:

- [AUTO_RANDOM](/auto-random.md)
- [Insert Data](/develop/dev-guide-insert-data.md)
- [SESSION_VARIABLES](/information-schema/information-schema-session-variables.md)
- [System Variables](/system-variables.md#allow_auto_random_explicit_insert-new-in-v403)
- [VARIABLES_INFO](/information-schema/information-schema-variables-info.md)

### authentication_ldap_sasl_auth_method_name

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_sasl_auth_method_name-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_sasl_bind_base_dn

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_sasl_bind_base_dn-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_sasl_bind_root_dn

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_sasl_bind_root_dn-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_sasl_bind_root_pwd

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_sasl_bind_root_pwd-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_sasl_ca_path

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_sasl_ca_path-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_sasl_init_pool_size

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_sasl_init_pool_size-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_sasl_max_pool_size

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_sasl_max_pool_size-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_sasl_server_host

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_sasl_server_host-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_sasl_server_port

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_sasl_server_port-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_sasl_tls

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_sasl_tls-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_simple_auth_method_name

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_simple_auth_method_name-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_simple_bind_base_dn

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_simple_bind_base_dn-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_simple_bind_root_dn

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_simple_bind_root_dn-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_simple_bind_root_pwd

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_simple_bind_root_pwd-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_simple_ca_path

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_simple_ca_path-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_simple_init_pool_size

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_simple_init_pool_size-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_simple_max_pool_size

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_simple_max_pool_size-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_simple_server_host

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_simple_server_host-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_simple_server_port

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_simple_server_port-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### authentication_ldap_simple_tls

Referenced in:

- [System Variables](/system-variables.md#authentication_ldap_simple_tls-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### auto_increment_increment

Referenced in:

- [AUTO_INCREMENT](/auto-increment.md)
- [AUTO_RANDOM](/auto-random.md)
- [Bidirectional Replication](/ticdc/ticdc-bidirectional-replication.md)
- [Error Codes and Troubleshooting](/error-codes.md)
- [SESSION_VARIABLES](/information-schema/information-schema-session-variables.md)
- [System Variables](/system-variables.md#auto_increment_increment)
- [VARIABLES_INFO](/information-schema/information-schema-variables-info.md)
- [TiDB 7.1.6 Release Notes](/releases/release-7.1.6.md)
- [TiDB 6.5.10 Release Notes](/releases/release-6.5.10.md)
- [TiDB 3.0.9 Release Notes](/releases/release-3.0.9.md)

### auto_increment_offset

Referenced in:

- [AUTO_INCREMENT](/auto-increment.md)
- [AUTO_RANDOM](/auto-random.md)
- [Bidirectional Replication](/ticdc/ticdc-bidirectional-replication.md)
- [Error Codes and Troubleshooting](/error-codes.md)
- [SESSION_VARIABLES](/information-schema/information-schema-session-variables.md)
- [System Variables](/system-variables.md#auto_increment_offset)
- [VARIABLES_INFO](/information-schema/information-schema-variables-info.md)
- [TiDB 7.1.6 Release Notes](/releases/release-7.1.6.md)
- [TiDB 6.5.10 Release Notes](/releases/release-6.5.10.md)
- [TiDB 3.0.9 Release Notes](/releases/release-3.0.9.md)

### autocommit

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [Non-Transactional DML Statements](/non-transactional-dml.md)
- [System Variables](/system-variables.md#autocommit)
- [Transactions](/transaction-overview.md)

### block_encryption_mode

Referenced in:

- [Encryption and Compression Functions](/functions-and-operators/encryption-and-compression-functions.md)
- [System Variables](/system-variables.md#block_encryption_mode)

### character_set_client

Referenced in:

- [Character Set and Collation](/character-set-and-collation.md)
- [GBK](/character-set-gbk.md)
- [SET [NAMES|CHARACTER SET]](/sql-statements/sql-statement-set-names.md)
- [System Variables](/system-variables.md#character_set_client)
- [Use Dumpling to Export Data](/dumpling-overview.md)
- [VIEWS](/information-schema/information-schema-views.md)
- [Views](/views.md)
- [Views](/develop/dev-guide-use-views.md)

### character_set_connection

Referenced in:

- [Character Set and Collation](/character-set-and-collation.md)
- [GBK](/character-set-gbk.md)
- [SET [NAMES|CHARACTER SET]](/sql-statements/sql-statement-set-names.md)
- [System Variables](/system-variables.md#character_set_connection)
- [Use Dumpling to Export Data](/dumpling-overview.md)

### character_set_database

Referenced in:

- [Character Set and Collation](/character-set-and-collation.md)
- [SET [NAMES|CHARACTER SET]](/sql-statements/sql-statement-set-names.md)
- [System Variables](/system-variables.md#character_set_database)

### character_set_results

Referenced in:

- [Character Set and Collation](/character-set-and-collation.md)
- [SET [NAMES|CHARACTER SET]](/sql-statements/sql-statement-set-names.md)
- [System Variables](/system-variables.md#character_set_results)
- [TiDB 8.5.4 Release Notes](/releases/release-8.5.4.md)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)
- [TiDB 2.1 RC1 Release Notes](/releases/release-2.1-rc.1.md)

### character_set_server

Referenced in:

- [Character Set and Collation](/character-set-and-collation.md)
- [SET [NAMES|CHARACTER SET]](/sql-statements/sql-statement-set-names.md)
- [System Variables](/system-variables.md#character_set_server)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)

### collation_connection

Referenced in:

- [Character Set and Collation](/character-set-and-collation.md)
- [SQL FAQs](/faq/sql-faq.md)
- [String Functions](/functions-and-operators/string-functions.md)
- [System Variables](/system-variables.md#collation_connection)
- [VIEWS](/information-schema/information-schema-views.md)
- [Views](/views.md)
- [Views](/develop/dev-guide-use-views.md)

### collation_database

Referenced in:

- [Character Set and Collation](/character-set-and-collation.md)
- [System Variables](/system-variables.md#collation_database)

### collation_server

Referenced in:

- [Character Set and Collation](/character-set-and-collation.md)
- [System Variables](/system-variables.md#collation_server)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)
- [TiDB 5.1 Release Notes](/releases/release-5.1.0.md)
- [TiDB 5.0.2 Release Notes](/releases/release-5.0.2.md)

### cte_max_recursion_depth

Referenced in:

- [Best Practices for High-Concurrency Writes](/best-practices/high-concurrency-best-practices.md)
- [System Variables](/system-variables.md#cte_max_recursion_depth)
- [TiDB 5.1 Release Notes](/releases/release-5.1.0.md)

### datadir

Referenced in:

- [System Variables](/system-variables.md#datadir)

### ddl_slow_threshold

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#ddl_slow_threshold)

### default_authentication_plugin

Referenced in:

- [Security Compatibility with MySQL](/security-compatibility-with-mysql.md)
- [System Variables](/system-variables.md#default_authentication_plugin)
- [TiDB Features](/basic-features.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)
- [TiDB 5.2 Release Notes](/releases/release-5.2.0.md)

### default_collation_for_utf8mb4

Referenced in:

- [Character Set and Collation](/character-set-and-collation.md)
- [System Variables](/system-variables.md#default_collation_for_utf8mb4-new-in-v740)
- [TiDB 8.1.2 Release Notes](/releases/release-8.1.2.md)
- [TiDB 7.5.5 Release Notes](/releases/release-7.5.5.md)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)

### default_password_lifetime

Referenced in:

- [System Variables](/system-variables.md#default_password_lifetime-new-in-v650)
- [TiDB Password Management](/password-management.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### default_week_format

Referenced in:

- [Date and Time Functions](/functions-and-operators/date-and-time-functions.md)
- [System Variables](/system-variables.md#default_week_format)
- [TiDB 4.0.11 Release Notes](/releases/release-4.0.11.md)
- [TiDB 2.1.7 Release Notes](/releases/release-2.1.7.md)

### disconnect_on_expired_password

Referenced in:

- [System Variables](/system-variables.md#disconnect_on_expired_password-new-in-v650)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### div_precision_increment

Referenced in:

- [Numeric Functions and Operators](/functions-and-operators/numeric-functions-and-operators.md)
- [System Variables](/system-variables.md#div_precision_increment-new-in-v800)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)

### error_count

Referenced in:

- [System Variables](/system-variables.md#error_count)
- [TiDB 2.1 RC1 Release Notes](/releases/release-2.1-rc.1.md)

### foreign_key_checks

Referenced in:

- [Compatibility Catalog of TiDB Data Migration](/dm/dm-compatibility-catalog.md)
- [FOREIGN KEY Constraints](/foreign-key.md)
- [Pipelined DML](/pipelined-dml.md)
- [System Variables](/system-variables.md#foreign_key_checks)
- [TiCDC Data Replication Capabilities](/ticdc/ticdc-data-replication-capabilities.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### group_concat_max_len

Referenced in:

- [Aggregate (GROUP BY) Functions](/functions-and-operators/aggregate-group-by-functions.md)
- [System Variables](/system-variables.md#group_concat_max_len)
- [TiDB 4.0.13 Release Notes](/releases/release-4.0.13.md)

### have_openssl

Referenced in:

- [Certificate-Based Authentication for Login](/certificate-authentication.md)
- [System Variables](/system-variables.md#have_openssl)

### have_ssl

Referenced in:

- [Certificate-Based Authentication for Login](/certificate-authentication.md)
- [System Variables](/system-variables.md#have_ssl)

### hostname

Referenced in:

- [System Variables](/system-variables.md#hostname)

### identity

Referenced in:

- [System Variables](/system-variables.md#identity-new-in-v530)

### init_connect

Referenced in:

- [System Variables](/system-variables.md#init_connect)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)
- [TiDB 5.1 Release Notes](/releases/release-5.1.0.md)
- [TiDB 5.0.4 Release Notes](/releases/release-5.0.4.md)
- [TiDB 4.0.14 Release Notes](/releases/release-4.0.14.md)

### innodb_lock_wait_timeout

Referenced in:

- [System Variables](/system-variables.md#innodb_lock_wait_timeout)
- [TiDB Pessimistic Transaction Mode](/pessimistic-transaction.md)
- [TiKV Configuration File](/tikv-configuration-file.md)
- [Troubleshoot Lock Conflicts](/troubleshoot-lock-conflicts.md)
- [TiDB 3.0.6 Release Notes](/releases/release-3.0.6.md)

### interactive_timeout

Referenced in:

- [Best Practices for Developing Java Applications with TiDB](/develop/java-app-best-practices.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#interactive_timeout)
- [TiDB Cluster Management FAQs](/faq/manage-cluster-faq.md)
- [Timeouts in TiDB](/develop/dev-guide-timeouts-in-tidb.md)
- [TiDB 3.0 Beta Release Notes](/releases/release-3.0-beta.md)
- [TiDB 3.0 GA Release Notes](/releases/release-3.0-ga.md)

### last_insert_id

Referenced in:

- [AUTO_RANDOM](/auto-random.md)
- [Connect to TiDB with mysql2](/develop/dev-guide-sample-application-ruby-mysql2.md)
- [Information Functions](/functions-and-operators/information-functions.md)
- [SHOW BUILTINS](/sql-statements/sql-statement-show-builtins.md)
- [SQL Prepared Execution Plan Cache](/sql-prepared-plan-cache.md)
- [System Variables](/system-variables.md#last_insert_id)
- [TiDB 7.2.0 Release Notes](/releases/release-7.2.0.md)
- [TiDB 3.1 RC Release Notes](/releases/release-3.1.0-rc.md)
- [TiDB 2.1.17 Release Notes](/releases/release-2.1.17.md)
- [TiDB 2.1 RC2 Release Notes](/releases/release-2.1-rc.2.md)

### last_plan_from_binding

Referenced in:

- [SQL Plan Management (SPM)](/sql-plan-management.md)
- [System Variables](/system-variables.md#last_plan_from_binding-new-in-v40)
- [TiDB 4.0.12 Release Notes](/releases/release-4.0.12.md)

### last_plan_from_cache

Referenced in:

- [Index Selection](/choose-index.md)
- [SQL Non-Prepared Execution Plan Cache](/sql-non-prepared-plan-cache.md)
- [SQL Prepared Execution Plan Cache](/sql-prepared-plan-cache.md)
- [System Variables](/system-variables.md#last_plan_from_cache-new-in-v40)
- [TiDB 4.0.2 Release Notes](/releases/release-4.0.2.md)

### last_sql_use_alloc

Referenced in:

- [System Variables](/system-variables.md#last_sql_use_alloc-new-in-v640)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### license

Referenced in:

- [System Variables](/system-variables.md#license)

### max_allowed_packet

Referenced in:

- [DM Advanced Task Configuration File](/dm/task-configuration-file-full.md)
- [Handle Errors in TiDB Data Migration](/dm/dm-error-handling.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#max_allowed_packet-new-in-v610)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Data Migration FAQs](/dm/dm-faq.md)
- [TiDB Lightning Configuration](/tidb-lightning/tidb-lightning-configuration.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)
- [TiDB 5.2.4 Release Notes](/releases/release-5.2.4.md)
- [TiDB 3.0.2 Release Notes](/releases/release-3.0.2.md)
- [TiDB 2.1.5 Release Notes](/releases/release-2.1.5.md)
- [TiDB 2.1 RC2 Release Notes](/releases/release-2.1-rc.2.md)
- [TiDB 2.0.6 Release Notes](/releases/release-2.0.6.md)

### max_connections

Referenced in:

- [Integrate TiDB with ProxySQL](/develop/dev-guide-proxysql-integration.md)
- [Modify Configuration Dynamically](/dynamic-config.md)
- [Precheck Errors, Migration Errors, and Alerts for Data Migration](https://docs.pingcap.com/tidbcloud/tidb-cloud-dm-precheck-and-troubleshooting)
- [System Variables](/system-variables.md#max_connections)
- [TiDB Cluster Management FAQs](/faq/manage-cluster-faq.md)
- [TiDB Configuration File](/tidb-configuration-file.md)

### max_execution_time

Referenced in:

- [Best Practices for Developing Java Applications with TiDB](/develop/java-app-best-practices.md)
- [Connection Pools and Connection Parameters](/develop/dev-guide-connection-parameters.md)
- [Optimizer Hints](/optimizer-hints.md)
- [SQL Plan Management (SPM)](/sql-plan-management.md)
- [SQL Prepared Execution Plan Cache](/sql-prepared-plan-cache.md)
- [System Variables](/system-variables.md#max_execution_time)
- [Timeouts in TiDB](/develop/dev-guide-timeouts-in-tidb.md)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [TiDB 8.5.4 Release Notes](/releases/release-8.5.4.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)
- [TiDB 4.0.2 Release Notes](/releases/release-4.0.2.md)
- [TiDB 2.1.14 Release Notes](/releases/release-2.1.14.md)

### max_prepared_stmt_count

Referenced in:

- [PREPARE](/sql-statements/sql-statement-prepare.md)
- [System Variables](/system-variables.md#max_prepared_stmt_count)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [TiDB 6.5.2 Release Notes](/releases/release-6.5.2.md)

### mpp_exchange_compression_mode

Referenced in:

- [Explain Statements in the MPP Mode](/explain-mpp.md)
- [System Variables](/system-variables.md#mpp_exchange_compression_mode-new-in-v660)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### mpp_version

Referenced in:

- [Explain Statements in the MPP Mode](/explain-mpp.md)
- [System Variables](/system-variables.md#mpp_version-new-in-v660)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### password_history

Referenced in:

- [Security Compatibility with MySQL](/security-compatibility-with-mysql.md)
- [System Variables](/system-variables.md#password_history-new-in-v650)
- [TiDB Password Management](/password-management.md)
- [`mysql` Schema](/mysql-schema/mysql-schema.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### password_reuse_interval

Referenced in:

- [System Variables](/system-variables.md#password_reuse_interval-new-in-v650)
- [TiDB Password Management](/password-management.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### pd_enable_follower_handle_region

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [System Variables](/system-variables.md#pd_enable_follower_handle_region-new-in-v760)
- [TiDB Features](/basic-features.md)
- [Tune Region Performance](/tune-region-performance.md)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)

### plugin_dir

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#plugin_dir)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)

### plugin_load

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#plugin_load)

### port

Referenced in:

- [System Variables](/system-variables.md#port)

### rand_seed1

Referenced in:

- [System Variables](/system-variables.md#rand_seed1)

### rand_seed2

Referenced in:

- [System Variables](/system-variables.md#rand_seed2)

### require_secure_transport

Referenced in:

- [Enable TLS between TiDB Clients and Servers](/enable-tls-between-clients-and-servers.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Migrate MySQL-Compatible Databases to TiDB Cloud Using Data Migration](https://docs.pingcap.com/tidbcloud/migrate-from-mysql-using-data-migration)
- [System Variables](/system-variables.md#require_secure_transport-new-in-v610)
- [TLS Connections to TiDB Cloud Dedicated](https://docs.pingcap.com/tidbcloud/tidb-cloud-tls-connect-to-dedicated)
- [TiDB Cloud Release Notes in 2022](https://docs.pingcap.com/tidbcloud/release-notes-2022)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)
- [TiDB 7.1.2 Release Notes](/releases/release-7.1.2.md)
- [TiDB 6.5.6 Release Notes](/releases/release-6.5.6.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### skip_name_resolve

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#skip_name_resolve-new-in-v520)

### socket

Referenced in:

- [System Variables](/system-variables.md#socket)

### sql_mode

Referenced in:

- [Aggregate (GROUP BY) Functions](/functions-and-operators/aggregate-group-by-functions.md)
- [DM Advanced Task Configuration File](/dm/task-configuration-file-full.md)
- [Date and Time Types](/data-type-date-and-time.md)
- [Miscellaneous Functions](/functions-and-operators/miscellaneous-functions.md)
- [Partitioning](/partitioned-table.md)
- [Precision Math](/functions-and-operators/precision-math.md)
- [Privilege Management](/privilege-management.md)
- [SHOW ERRORS](/sql-statements/sql-statement-show-errors.md)
- [SHOW WARNINGS](/sql-statements/sql-statement-show-warnings.md)
- [SQL FAQs](/faq/sql-faq.md)
- [SQL Mode](/sql-mode.md)
- [Schema Object Names](/schema-object-names.md)
- [System Variables](/system-variables.md#sql_mode)
- [TiDB Lightning FAQs](/tidb-lightning/tidb-lightning-faq.md)
- [TiDB User Account Management](/user-account-management.md)
- [TiFlash Query Result Materialization](/tiflash/tiflash-results-materialization.md)
- [Unstable Result Set](/develop/dev-guide-unstable-result-set.md)
- [Use TiDB to Read TiFlash Replicas](/tiflash/use-tidb-to-read-tiflash.md)
- [`SET [GLOBAL|SESSION] <variable>`](/sql-statements/sql-statement-set-variable.md)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.1.0 Release Notes](/releases/release-8.1.0.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)
- [TiDB 7.5.5 Release Notes](/releases/release-7.5.5.md)
- [TiDB 7.5.3 Release Notes](/releases/release-7.5.3.md)
- [TiDB 7.5.2 Release Notes](/releases/release-7.5.2.md)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)
- [TiDB 7.1.5 Release Notes](/releases/release-7.1.5.md)
- [TiDB 7.1.4 Release Notes](/releases/release-7.1.4.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 6.5.9 Release Notes](/releases/release-6.5.9.md)
- [TiDB 6.5.7 Release Notes](/releases/release-6.5.7.md)
- [TiDB 5.4.1 Release Notes](/releases/release-5.4.1.md)
- [TiDB 5.1 Release Notes](/releases/release-5.1.0.md)
- [TiDB 5.0.2 Release Notes](/releases/release-5.0.2.md)
- [TiDB 4.0.16 Release Notes](/releases/release-4.0.16.md)
- [TiDB RC2 Release Notes](/releases/release-rc.2.md)

### sql_require_primary_key

Referenced in:

- [DM Advanced Task Configuration File](/dm/task-configuration-file-full.md)
- [System Variables](/system-variables.md#sql_require_primary_key-new-in-v630)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### sql_select_limit

Referenced in:

- [SQL Prepared Execution Plan Cache](/sql-prepared-plan-cache.md)
- [System Variables](/system-variables.md#sql_select_limit-new-in-v402)
- [TiDB 4.0.2 Release Notes](/releases/release-4.0.2.md)

### ssl_ca

Referenced in:

- [Certificate-Based Authentication for Login](/certificate-authentication.md)
- [Connect to TiDB with Django](/develop/dev-guide-sample-application-python-django.md)
- [Connect to TiDB with MySQL Connector/Python](/develop/dev-guide-sample-application-python-mysql-connector.md)
- [Connect to TiDB with PyMySQL](/develop/dev-guide-sample-application-python-pymysql.md)
- [Connect to TiDB with SQLAlchemy](/develop/dev-guide-sample-application-python-sqlalchemy.md)
- [Connect to TiDB with peewee](/develop/dev-guide-sample-application-python-peewee.md)
- [Integrate TiDB Vector Search with Jina AI Embeddings API](/ai/integrations/vector-search-integrate-with-jinaai-embedding.md)
- [Integrate TiDB Vector Search with SQLAlchemy](/ai/integrations/vector-search-integrate-with-sqlalchemy.md)
- [Integrate Vector Search with LangChain](/ai/integrations/vector-search-integrate-with-langchain.md)
- [Integrate Vector Search with LlamaIndex](/ai/integrations/vector-search-integrate-with-llamaindex.md)
- [System Variables](/system-variables.md#ssl_ca)

### ssl_cert

Referenced in:

- [Certificate-Based Authentication for Login](/certificate-authentication.md)
- [System Variables](/system-variables.md#ssl_cert)

### ssl_key

Referenced in:

- [Certificate-Based Authentication for Login](/certificate-authentication.md)
- [System Variables](/system-variables.md#ssl_key)

### system_time_zone

Referenced in:

- [System Variables](/system-variables.md#system_time_zone)
- [Time Zone Support](/configure-time-zone.md)
- [TiDB 3.0.8 Release Notes](/releases/release-3.0.8.md)

### tidb_adaptive_closest_read_threshold

Referenced in:

- [Follower Read](/follower-read.md)
- [System Variables](/system-variables.md#tidb_adaptive_closest_read_threshold-new-in-v630)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_allow_batch_cop

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_allow_batch_cop-new-in-v40)
- [TiDB 4.0.3 Release Notes](/releases/release-4.0.3.md)
- [TiDB 4.0 RC.2 Release Notes](/releases/release-4.0.0-rc.2.md)

### tidb_allow_fallback_to_tikv

Referenced in:

- [System Variables](/system-variables.md#tidb_allow_fallback_to_tikv-new-in-v50)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_allow_function_for_expression_index

Referenced in:

- [CREATE INDEX](/sql-statements/sql-statement-create-index.md)
- [System Variables](/system-variables.md#tidb_allow_function_for_expression_index-new-in-v520)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Features](/basic-features.md)

### tidb_allow_mpp

Referenced in:

- [Explain Statements in the MPP Mode](/explain-mpp.md)
- [Explore HTAP](/explore-htap.md)
- [System Variables](/system-variables.md#tidb_allow_mpp-new-in-v50)
- [TiFlash Query Result Materialization](/tiflash/tiflash-results-materialization.md)
- [Use TiFlash MPP Mode](/tiflash/use-tiflash-mpp-mode.md)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### tidb_allow_remove_auto_inc

Referenced in:

- [AUTO_INCREMENT](/auto-increment.md)
- [Known Incompatibility Issues with Third-Party Tools](/develop/dev-guide-third-party-tools-compatibility.md)
- [MySQL Compatibility](/mysql-compatibility.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_allow_remove_auto_inc-new-in-v2118-and-v304)
- [TiDB 3.0.4 Release Notes](/releases/release-3.0.4.md)
- [TiDB 2.1.18 Release Notes](/releases/release-2.1.18.md)

### tidb_allow_tiflash_cop

Referenced in:

- [System Variables](/system-variables.md#tidb_allow_tiflash_cop-new-in-v730)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)

### tidb_analyze_column_options

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [How to Run CH-benCHmark Test on TiDB](/benchmark/benchmark-tidb-using-ch.md)
- [Stress Test TiDB Using TiUP Bench Component](/tiup/tiup-bench.md)
- [System Variables](/system-variables.md#tidb_analyze_column_options-new-in-v830)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)

### tidb_analyze_distsql_scan_concurrency

Referenced in:

- [System Variables](/system-variables.md#tidb_analyze_distsql_scan_concurrency-new-in-v760)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)

### tidb_analyze_partition_concurrency

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [System Variables](/system-variables.md#tidb_analyze_partition_concurrency)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 8.1.1 Release Notes](/releases/release-8.1.1.md)
- [TiDB 7.5.3 Release Notes](/releases/release-7.5.3.md)
- [TiDB 7.5.0 Release Notes](/releases/release-7.5.0.md)

### tidb_analyze_skip_column_types

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_analyze_skip_column_types-new-in-v720)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 7.2.0 Release Notes](/releases/release-7.2.0.md)

### tidb_analyze_version

Referenced in:

- [ANALYZE_STATUS](/information-schema/information-schema-analyze-status.md)
- [Introduction to Statistics](/statistics.md)
- [SHOW ANALYZE STATUS](/sql-statements/sql-statement-show-analyze-status.md)
- [System Variables](/system-variables.md#tidb_analyze_version-new-in-v510)
- [TiDB Memory Control](/configure-memory-usage.md)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [TiDB 7.2.0 Release Notes](/releases/release-7.2.0.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)
- [TiDB 5.2.4 Release Notes](/releases/release-5.2.4.md)
- [TiDB 5.1.4 Release Notes](/releases/release-5.1.4.md)
- [TiDB 5.1 Release Notes](/releases/release-5.1.0.md)

### tidb_auto_analyze_concurrency

Referenced in:

- [Best Practices for Handling Millions of Tables in SaaS Multi-Tenant Scenarios](/best-practices/saas-best-practices.md)
- [Introduction to Statistics](/statistics.md)
- [System Variables](/system-variables.md#tidb_auto_analyze_concurrency-new-in-v840)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)

### tidb_auto_analyze_end_time

Referenced in:

- [A Practical Guide for SQL Tuning](/sql-tuning-best-practice.md)
- [Introduction to Statistics](/statistics.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_auto_analyze_end_time)
- [TiDB Troubleshooting Map](/tidb-troubleshooting-map.md)
- [Troubleshoot Increased Read and Write Latency](/troubleshoot-cpu-issues.md)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)

### tidb_auto_analyze_partition_batch_size

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [System Variables](/system-variables.md#tidb_auto_analyze_partition_batch_size-new-in-v640)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_auto_analyze_ratio

Referenced in:

- [A Practical Guide for SQL Tuning](/sql-tuning-best-practice.md)
- [Introduction to Statistics](/statistics.md)
- [SHOW STATS_HEALTHY](/sql-statements/sql-statement-show-stats-healthy.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_auto_analyze_ratio)
- [TiDB Troubleshooting Map](/tidb-troubleshooting-map.md)
- [Troubleshoot Increased Read and Write Latency](/troubleshoot-cpu-issues.md)
- [`EXPLAIN` Walkthrough](/explain-walkthrough.md)
- [TiDB 8.1.0 Release Notes](/releases/release-8.1.0.md)
- [TiDB 2.0.1 Release Notes](/releases/release-2.0.1.md)

### tidb_auto_analyze_start_time

Referenced in:

- [A Practical Guide for SQL Tuning](/sql-tuning-best-practice.md)
- [Introduction to Statistics](/statistics.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_auto_analyze_start_time)
- [TiDB Troubleshooting Map](/tidb-troubleshooting-map.md)
- [Troubleshoot Increased Read and Write Latency](/troubleshoot-cpu-issues.md)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)

### tidb_auto_build_stats_concurrency

Referenced in:

- [Best Practices for Handling Millions of Tables in SaaS Multi-Tenant Scenarios](/best-practices/saas-best-practices.md)
- [System Variables](/system-variables.md#tidb_auto_build_stats_concurrency-new-in-v650)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_backoff_lock_fast

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_backoff_lock_fast)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)

### tidb_backoff_weight

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_backoff_weight)
- [TiDB 3.0.3 Release Notes](/releases/release-3.0.3.md)

### tidb_batch_commit

Referenced in:

- [Batch Processing](/batch-processing.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_batch_commit)
- [TiDB 3.0 Beta Release Notes](/releases/release-3.0-beta.md)
- [TiDB 3.0 GA Release Notes](/releases/release-3.0-ga.md)

### tidb_batch_delete

Referenced in:

- [Batch Processing](/batch-processing.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_batch_delete)

### tidb_batch_insert

Referenced in:

- [Batch Processing](/batch-processing.md)
- [System Variables](/system-variables.md#tidb_batch_insert)
- [TiDB 2.0.6 Release Notes](/releases/release-2.0.6.md)

### tidb_batch_pending_tiflash_count

Referenced in:

- [Create TiFlash Replicas](/tiflash/create-tiflash-replicas.md)
- [System Variables](/system-variables.md#tidb_batch_pending_tiflash_count-new-in-v60)

### tidb_broadcast_join_threshold_count

Referenced in:

- [Explain Statements in the MPP Mode](/explain-mpp.md)
- [System Variables](/system-variables.md#tidb_broadcast_join_threshold_count-new-in-v50)
- [Tune TiFlash Performance](/tiflash/tune-tiflash-performance.md)
- [Use TiFlash MPP Mode](/tiflash/use-tiflash-mpp-mode.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### tidb_broadcast_join_threshold_size

Referenced in:

- [Explain Statements in the MPP Mode](/explain-mpp.md)
- [System Variables](/system-variables.md#tidb_broadcast_join_threshold_size-new-in-v50)
- [Tune TiFlash Performance](/tiflash/tune-tiflash-performance.md)
- [Use TiFlash MPP Mode](/tiflash/use-tiflash-mpp-mode.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### tidb_build_sampling_stats_concurrency

Referenced in:

- [Best Practices for Handling Millions of Tables in SaaS Multi-Tenant Scenarios](/best-practices/saas-best-practices.md)
- [Introduction to Statistics](/statistics.md)
- [System Variables](/system-variables.md#tidb_build_sampling_stats_concurrency-new-in-v750)
- [TiDB 7.5.0 Release Notes](/releases/release-7.5.0.md)

### tidb_build_stats_concurrency

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_build_stats_concurrency)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v6.5.6](https://docs.pingcap.com/tidbcloud/v6.5-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v7.1.3](https://docs.pingcap.com/tidbcloud/v7.1-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v7.5.0](https://docs.pingcap.com/tidbcloud/v7.5-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v8.1.0](https://docs.pingcap.com/tidbcloud/v8.1-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v8.5.0](https://docs.pingcap.com/tidbcloud/v8.5-performance-benchmarking-with-tpcc)
- [TiDB 7.5.0 Release Notes](/releases/release-7.5.0.md)

### tidb_capture_plan_baselines

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL Plan Management (SPM)](/sql-plan-management.md)
- [System Variables](/system-variables.md#tidb_capture_plan_baselines-new-in-v40)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)
- [TiDB 4.0 RC.1 Release Notes](/releases/release-4.0.0-rc.1.md)

### tidb_cdc_write_source

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_cdc_write_source-new-in-v650)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_check_mb4_value_in_utf8

Referenced in:

- [Character Set and Collation](/character-set-and-collation.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_check_mb4_value_in_utf8)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [Upgrade and After Upgrade FAQs](/faq/upgrade-faq.md)

### tidb_checksum_table_concurrency

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_checksum_table_concurrency)
- [TiDB Lightning Configuration](/tidb-lightning/tidb-lightning-configuration.md)

### tidb_cloud_storage_uri

Referenced in:

- [IMPORT INTO](/sql-statements/sql-statement-import-into.md)
- [System Variables](/system-variables.md#tidb_cloud_storage_uri-new-in-v740)
- [TiDB Global Sort](/tidb-global-sort.md)
- [TiDB 8.1.1 Release Notes](/releases/release-8.1.1.md)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)

### tidb_committer_concurrency

Referenced in:

- [System Variables](/system-variables.md#tidb_committer_concurrency-new-in-v610)
- [TiDB Cloud Release Notes in 2022](https://docs.pingcap.com/tidbcloud/release-notes-2022)
- [TiDB Monitoring Metrics](/grafana-tidb-dashboard.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_config

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_config)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)
- [TiDB 1.1 Beta Release Notes](/releases/release-1.1-beta.md)

### tidb_constraint_check_in_place

Referenced in:

- [COMMIT](/sql-statements/sql-statement-commit.md)
- [Constraints](/constraints.md)
- [DM Advanced Task Configuration File](/dm/task-configuration-file-full.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_constraint_check_in_place)
- [Transactions](/transaction-overview.md)
- [TiDB 2.1.5 Release Notes](/releases/release-2.1.5.md)

### tidb_constraint_check_in_place_pessimistic

Referenced in:

- [Constraints](/constraints.md)
- [Error Codes and Troubleshooting](/error-codes.md)
- [Modify Configuration Dynamically](/dynamic-config.md)
- [SAVEPOINT](/sql-statements/sql-statement-savepoint.md)
- [System Variables](/system-variables.md#tidb_constraint_check_in_place_pessimistic-new-in-v630)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Pessimistic Transaction Mode](/pessimistic-transaction.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_cost_model_version

Referenced in:

- [Cost Model](/cost-model.md)
- [System Variables](/system-variables.md#tidb_cost_model_version-new-in-v620)
- [TiDB 7.5.7 Release Notes](/releases/release-7.5.7.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tidb_current_ts

Referenced in:

- [DR Solution Based on Primary and Secondary Clusters](/dr-secondary-cluster.md)
- [FLASHBACK CLUSTER](/sql-statements/sql-statement-flashback-cluster.md)
- [Migrate and Upgrade a TiDB Cluster](/tidb-upgrade-migration-guide.md)
- [Read Historical Data Using the `tidb_external_ts` Variable](/tidb-external-ts.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_current_ts)
- [TiDB Specific Functions](/functions-and-operators/tidb-functions.md)
- [TimeStamp Oracle (TSO) in TiDB](/tso.md)
- [Upstream and Downstream Clusters Data Validation and Snapshot Read](/ticdc/ticdc-upstream-downstream-check.md)

### tidb_ddl_disk_quota

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_ddl_disk_quota-new-in-v630)
- [TiDB Distributed eXecution Framework (DXF)](/tidb-distributed-execution-framework.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_ddl_enable_fast_reorg

Referenced in:

- [ADD INDEX](/sql-statements/sql-statement-add-index.md)
- [ADMIN SHOW DDL [JOBS|JOB QUERIES]](/sql-statements/sql-statement-admin-show-ddl.md)
- [CREATE INDEX](/sql-statements/sql-statement-create-index.md)
- [IMPORT INTO](/sql-statements/sql-statement-import-into.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_ddl_enable_fast_reorg-new-in-v630)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Distributed eXecution Framework (DXF)](/tidb-distributed-execution-framework.md)
- [TiDB Environment and System Configuration Check](/check-before-deployment.md)
- [TiDB Features](/basic-features.md)
- [TiDB Software and Hardware Requirements](/hardware-and-software-requirements.md)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.1.2 Release Notes](/releases/release-8.1.2.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 7.5.5 Release Notes](/releases/release-7.5.5.md)
- [TiDB 7.5.0 Release Notes](/releases/release-7.5.0.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_ddl_error_count_limit

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_ddl_error_count_limit)
- [TiDB Distributed eXecution Framework (DXF)](/tidb-distributed-execution-framework.md)

### tidb_ddl_flashback_concurrency

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_ddl_flashback_concurrency-new-in-v630)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_ddl_reorg_batch_size

Referenced in:

- [ADMIN ALTER DDL JOBS](/sql-statements/sql-statement-admin-alter-ddl.md)
- [ADMIN SHOW DDL [JOBS|JOB QUERIES]](/sql-statements/sql-statement-admin-show-ddl.md)
- [Best Practices for DDL Execution in TiDB](/best-practices/ddl-introduction.md)
- [CREATE INDEX](/sql-statements/sql-statement-create-index.md)
- [Interaction Test on Online Workloads and `ADD INDEX` Operations](/benchmark/online-workloads-and-add-index-operations.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Performance Tuning Best Practices](/develop/dev-guide-optimize-sql-best-practices.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_ddl_reorg_batch_size)
- [TiDB Distributed eXecution Framework (DXF)](/tidb-distributed-execution-framework.md)
- [Troubleshoot Increased Read and Write Latency](/troubleshoot-cpu-issues.md)
- [`EXPLAIN` Walkthrough](/explain-walkthrough.md)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 3.0.3 Release Notes](/releases/release-3.0.3.md)
- [TiDB 2.1.4 Release Notes](/releases/release-2.1.4.md)

### tidb_ddl_reorg_max_write_speed

Referenced in:

- [ADMIN ALTER DDL JOBS](/sql-statements/sql-statement-admin-alter-ddl.md)
- [ADMIN SHOW DDL [JOBS|JOB QUERIES]](/sql-statements/sql-statement-admin-show-ddl.md)
- [System Variables](/system-variables.md#tidb_ddl_reorg_max_write_speed-new-in-v6512-v755-and-v850)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 7.5.5 Release Notes](/releases/release-7.5.5.md)
- [TiDB 6.5.12 Release Notes](/releases/release-6.5.12.md)

### tidb_ddl_reorg_priority

Referenced in:

- [CREATE INDEX](/sql-statements/sql-statement-create-index.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_ddl_reorg_priority)
- [TiDB Distributed eXecution Framework (DXF)](/tidb-distributed-execution-framework.md)
- [Troubleshoot Increased Read and Write Latency](/troubleshoot-cpu-issues.md)
- [TiDB 2.1 RC1 Release Notes](/releases/release-2.1-rc.1.md)

### tidb_ddl_reorg_worker_cnt

Referenced in:

- [ADMIN ALTER DDL JOBS](/sql-statements/sql-statement-admin-alter-ddl.md)
- [ADMIN SHOW DDL [JOBS|JOB QUERIES]](/sql-statements/sql-statement-admin-show-ddl.md)
- [Best Practices for DDL Execution in TiDB](/best-practices/ddl-introduction.md)
- [CREATE INDEX](/sql-statements/sql-statement-create-index.md)
- [Interaction Test on Online Workloads and `ADD INDEX` Operations](/benchmark/online-workloads-and-add-index-operations.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Performance Tuning Best Practices](/develop/dev-guide-optimize-sql-best-practices.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_ddl_reorg_worker_cnt)
- [TiDB Distributed eXecution Framework (DXF)](/tidb-distributed-execution-framework.md)
- [Troubleshoot Increased Read and Write Latency](/troubleshoot-cpu-issues.md)
- [`EXPLAIN` Walkthrough](/explain-walkthrough.md)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 3.0.3 Release Notes](/releases/release-3.0.3.md)
- [TiDB 2.1.4 Release Notes](/releases/release-2.1.4.md)

### tidb_default_string_match_selectivity

Referenced in:

- [System Variables](/system-variables.md#tidb_default_string_match_selectivity-new-in-v620)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tidb_disable_txn_auto_retry

Referenced in:

- [How to Test TiDB Using Sysbench](/benchmark/benchmark-tidb-using-sysbench.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_disable_txn_auto_retry)
- [TiDB Optimistic Transaction Model](/optimistic-transaction.md)
- [Transactions](/transaction-overview.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)
- [TiDB 3.0.0-rc.2 Release Notes](/releases/release-3.0.0-rc.2.md)
- [TiDB 3.0 GA Release Notes](/releases/release-3.0-ga.md)
- [TiDB 2.1 Beta Release Notes](/releases/release-2.1-beta.md)
- [TiDB 2.1 GA Release Notes](/releases/release-2.1-ga.md)
- [TiDB 2.0.5 Release Notes](/releases/release-2.0.5.md)

### tidb_distsql_scan_concurrency

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SLOW_QUERY](/information-schema/information-schema-slow-query.md)
- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_distsql_scan_concurrency)
- [TiDB Best Practices](/best-practices/tidb-best-practices.md)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v6.5.6](https://docs.pingcap.com/tidbcloud/v6.5-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v7.1.3](https://docs.pingcap.com/tidbcloud/v7.1-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v7.5.0](https://docs.pingcap.com/tidbcloud/v7.5-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v8.1.0](https://docs.pingcap.com/tidbcloud/v8.1-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v8.5.0](https://docs.pingcap.com/tidbcloud/v8.5-performance-benchmarking-with-tpcc)
- [TiDB Memory Control](/configure-memory-usage.md)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [Use Dumpling to Export Data](/dumpling-overview.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_dml_batch_size

Referenced in:

- [Batch Processing](/batch-processing.md)
- [LOAD DATA](/sql-statements/sql-statement-load-data.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_dml_batch_size)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)
- [TiDB 4.0 Beta Release Notes](/releases/release-4.0.0-beta.md)

### tidb_dml_type

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [IMPORT INTO vs. TiDB Lightning](/tidb-lightning/import-into-vs-tidb-lightning.md)
- [Identify Expensive Queries](/identify-expensive-queries.md)
- [Pipelined DML](/pipelined-dml.md)
- [System Variables](/system-variables.md#tidb_dml_type-new-in-v800)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Features](/basic-features.md)
- [TiDB Memory Control](/configure-memory-usage.md)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 8.1.0 Release Notes](/releases/release-8.1.0.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)

### tidb_enable_1pc

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_enable_1pc-new-in-v50)
- [TiDB Cluster Management FAQs](/faq/manage-cluster-faq.md)
- [TiDB Features](/basic-features.md)
- [Transactions](/transaction-overview.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_enable_analyze_snapshot

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_analyze_snapshot-new-in-v620)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tidb_enable_async_commit

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_enable_async_commit-new-in-v50)
- [TiDB Cluster Management FAQs](/faq/manage-cluster-faq.md)
- [TiDB Features](/basic-features.md)
- [Transactions](/transaction-overview.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)
- [TiDB 5.0 RC Release Notes](/releases/release-5.0.0-rc.md)

### tidb_enable_async_merge_global_stats

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_async_merge_global_stats-new-in-v750)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 8.1.1 Release Notes](/releases/release-8.1.1.md)
- [TiDB 7.5.3 Release Notes](/releases/release-7.5.3.md)
- [TiDB 7.5.0 Release Notes](/releases/release-7.5.0.md)

### tidb_enable_auto_analyze

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [Introduction to Statistics](/statistics.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_enable_auto_analyze-new-in-v610)
- [Use PLAN REPLAYER to Save and Restore the On-Site Information of a Cluster](/sql-plan-replayer.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_enable_auto_analyze_priority_queue

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [System Variables](/system-variables.md#tidb_enable_auto_analyze_priority_queue-new-in-v800)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)

### tidb_enable_auto_increment_in_generated

Referenced in:

- [CREATE INDEX](/sql-statements/sql-statement-create-index.md)
- [System Variables](/system-variables.md#tidb_enable_auto_increment_in_generated)
- [TiDB 5.2 Release Notes](/releases/release-5.2.0.md)

### tidb_enable_batch_dml

Referenced in:

- [Batch Processing](/batch-processing.md)
- [System Variables](/system-variables.md#tidb_enable_batch_dml)
- [TiDB Cloud Release Notes in 2022](https://docs.pingcap.com/tidbcloud/release-notes-2022)

### tidb_enable_cascades_planner

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_enable_cascades_planner)
- [TiDB Features](/basic-features.md)
- [TiDB 3.0 Beta Release Notes](/releases/release-3.0-beta.md)

### tidb_enable_check_constraint

Referenced in:

- [CHECK\_CONSTRAINTS](/information-schema/information-schema-check-constraints.md)
- [Constraints](/constraints.md)
- [System Variables](/system-variables.md#tidb_enable_check_constraint-new-in-v720)
- [TIDB\_CHECK\_CONSTRAINTS](/information-schema/information-schema-tidb-check-constraints.md)
- [TiDB 7.2.0 Release Notes](/releases/release-7.2.0.md)

### tidb_enable_chunk_rpc

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_enable_chunk_rpc-new-in-v40)

### tidb_enable_clustered_index

Referenced in:

- [Clustered Indexes](/clustered-indexes.md)
- [Create a Table](/develop/dev-guide-create-table.md)
- [System Variables](/system-variables.md#tidb_enable_clustered_index-new-in-v50)
- [TiDB Backup & Restore Overview](/br/backup-and-restore-overview.md)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Database Schema Design Overview](/develop/dev-guide-schema-design-overview.md)
- [TiDB Lightning Configuration](/tidb-lightning/tidb-lightning-configuration.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)
- [TiDB 5.0 RC Release Notes](/releases/release-5.0.0-rc.md)

### tidb_enable_collect_execution_info

Referenced in:

- [Identify Slow Queries](/identify-slow-queries.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Modify Configuration Dynamically](/dynamic-config.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_enable_collect_execution_info)
- [TIDB_INDEX_USAGE](/information-schema/information-schema-tidb-index-usage.md)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)
- [TiDB 4.0.2 Release Notes](/releases/release-4.0.2.md)

### tidb_enable_column_tracking

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_column_tracking-new-in-v540)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)

### tidb_enable_ddl

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Modify Configuration Dynamically](/dynamic-config.md)
- [System Variables](/system-variables.md#tidb_enable_ddl-new-in-v630)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [Topology Configuration File for TiDB Deployment Using TiUP](/tiup/tiup-cluster-topology-reference.md)

### tidb_enable_dist_task

Referenced in:

- [ADMIN ALTER DDL JOBS](/sql-statements/sql-statement-admin-alter-ddl.md)
- [ADMIN SHOW DDL [JOBS|JOB QUERIES]](/sql-statements/sql-statement-admin-show-ddl.md)
- [IMPORT INTO](/sql-statements/sql-statement-import-into.md)
- [System Variables](/system-variables.md#tidb_enable_dist_task-new-in-v710)
- [TiDB Distributed eXecution Framework (DXF)](/tidb-distributed-execution-framework.md)
- [TiDB Global Sort](/tidb-global-sort.md)
- [TiDB Smooth Upgrade](/smooth-upgrade-tidb.md)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)
- [TiDB 8.1.0 Release Notes](/releases/release-8.1.0.md)
- [TiDB 7.5.0 Release Notes](/releases/release-7.5.0.md)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### tidb_enable_enhanced_security

Referenced in:

- [BACKUP](/sql-statements/sql-statement-backup.md)
- [Glossary](/glossary.md)
- [IMPORT INTO](/sql-statements/sql-statement-import-into.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_enable_enhanced_security)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Dashboard User Management](/dashboard/dashboard-user.md)
- [TiDB Features](/basic-features.md)
- [TiDB 5.1 Release Notes](/releases/release-5.1.0.md)

### tidb_enable_exchange_partition

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_exchange_partition)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_enable_extended_stats

Referenced in:

- [Introduction to Extended Statistics](/extended-statistics.md)
- [System Variables](/system-variables.md#tidb_enable_extended_stats)

### tidb_enable_external_ts_read

Referenced in:

- [DR Solution Based on Primary and Secondary Clusters](/dr-secondary-cluster.md)
- [Read Historical Data Using the `tidb_external_ts` Variable](/tidb-external-ts.md)
- [System Variables](/system-variables.md#tidb_enable_external_ts_read-new-in-v640)
- [Upstream and Downstream Clusters Data Validation and Snapshot Read](/ticdc/ticdc-upstream-downstream-check.md)
- [Usage Scenarios of Stale Read](/stale-read.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_enable_fast_analyze

Referenced in:

- [Introduction to Extended Statistics](/extended-statistics.md)
- [System Variables](/system-variables.md#tidb_enable_fast_analyze)
- [TiDB Features](/basic-features.md)
- [TiDB 7.5.0 Release Notes](/releases/release-7.5.0.md)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)
- [TiDB 3.0.0-rc.1 Release Notes](/releases/release-3.0.0-rc.1.md)

### tidb_enable_fast_create_table

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_fast_create_table-new-in-v800)
- [TiDB Accelerated Table Creation](/accelerated-table-creation.md)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)

### tidb_enable_fast_table_check

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_fast_table_check-new-in-v720)
- [TiDB 7.2.0 Release Notes](/releases/release-7.2.0.md)

### tidb_enable_foreign_key

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_foreign_key-new-in-v630)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_enable_gc_aware_memory_track

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_enable_gc_aware_memory_track)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_enable_global_index

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_global_index-new-in-v760)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)

### tidb_enable_gogc_tuner

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_enable_gogc_tuner-new-in-v640)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_enable_historical_stats

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_historical_stats)
- [Use PLAN REPLAYER to Save and Restore the On-Site Information of a Cluster](/sql-plan-replayer.md)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 7.5.7 Release Notes](/releases/release-7.5.7.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_enable_historical_stats_for_capture

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_historical_stats_for_capture)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_enable_index_merge

Referenced in:

- [Explain Statements Using Index Merge](/explain-index-merge.md)
- [Index Selection](/choose-index.md)
- [Optimizer Hints](/optimizer-hints.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_enable_index_merge-new-in-v40)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)

### tidb_enable_index_merge_join

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_index_merge_join)

### tidb_enable_inl_join_inner_multi_pattern

Referenced in:

- [Optimizer Hints](/optimizer-hints.md)
- [System Variables](/system-variables.md#tidb_enable_inl_join_inner_multi_pattern-new-in-v700)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_enable_instance_plan_cache

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [System Variables](/system-variables.md#tidb_enable_instance_plan_cache-new-in-v840)
- [TiDB Features](/basic-features.md)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)

### tidb_enable_lazy_cursor_fetch

Referenced in:

- [Best Practices for Developing Java Applications with TiDB](/develop/java-app-best-practices.md)
- [Connection Pools and Connection Parameters](/develop/dev-guide-connection-parameters.md)
- [System Variables](/system-variables.md#tidb_enable_lazy_cursor_fetch-new-in-v830)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)

### tidb_enable_legacy_instance_scope

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_legacy_instance_scope-new-in-v600)

### tidb_enable_list_partition

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_list_partition-new-in-v50)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_enable_local_txn

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_enable_local_txn)

### tidb_enable_metadata_lock

Referenced in:

- [Metadata Lock](/metadata-lock.md)
- [System Variables](/system-variables.md#tidb_enable_metadata_lock-new-in-v630)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_enable_mutation_checker

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_mutation_checker-new-in-v600)
- [Troubleshoot Inconsistency Between Data and Indexes](/troubleshoot-data-inconsistency-errors.md)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)

### tidb_enable_new_cost_interface

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_new_cost_interface-new-in-v620)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tidb_enable_new_only_full_group_by_check

Referenced in:

- [SQL Mode](/sql-mode.md)
- [System Variables](/system-variables.md#tidb_enable_new_only_full_group_by_check-new-in-v610)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_enable_non_prepared_plan_cache

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [SQL Non-Prepared Execution Plan Cache](/sql-non-prepared-plan-cache.md)
- [System Variables](/system-variables.md#tidb_enable_non_prepared_plan_cache)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)
- [TiDB 7.2.0 Release Notes](/releases/release-7.2.0.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_enable_non_prepared_plan_cache_for_dml

Referenced in:

- [SQL Non-Prepared Execution Plan Cache](/sql-non-prepared-plan-cache.md)
- [System Variables](/system-variables.md#tidb_enable_non_prepared_plan_cache_for_dml-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### tidb_enable_noop_functions

Referenced in:

- [Information Functions](/functions-and-operators/information-functions.md)
- [SELECT](/sql-statements/sql-statement-select.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_enable_noop_functions-new-in-v40)
- [TiDB Pessimistic Transaction Mode](/pessimistic-transaction.md)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)
- [TiDB 5.1 Release Notes](/releases/release-5.1.0.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_enable_noop_variables

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_noop_variables-new-in-v620)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tidb_enable_null_aware_anti_join

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_null_aware_anti_join-new-in-v630)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_enable_ordered_result_mode

Referenced in:

- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_enable_ordered_result_mode)
- [TiDB 7.1.3 Release Notes](/releases/release-7.1.3.md)
- [TiDB 6.5.6 Release Notes](/releases/release-6.5.6.md)

### tidb_enable_outer_join_reorder

Referenced in:

- [Introduction to Join Reorder](/join-reorder.md)
- [System Variables](/system-variables.md#tidb_enable_outer_join_reorder-new-in-v610)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)
- [TiDB 6.1.1 Release Notes](/releases/release-6.1.1.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_enable_paging

Referenced in:

- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_enable_paging-new-in-v540)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)

### tidb_enable_parallel_apply

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_parallel_apply-new-in-v50)
- [TiDB 8.5.4 Release Notes](/releases/release-8.5.4.md)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)
- [TiDB 7.1.1 Release Notes](/releases/release-7.1.1.md)
- [TiDB 6.5.4 Release Notes](/releases/release-6.5.4.md)
- [TiDB 5.4.1 Release Notes](/releases/release-5.4.1.md)

### tidb_enable_parallel_hashagg_spill

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_parallel_hashagg_spill-new-in-v800)
- [TiDB Memory Control](/configure-memory-usage.md)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 8.1.1 Release Notes](/releases/release-8.1.1.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)

### tidb_enable_pipelined_window_function

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_pipelined_window_function)
- [Window Functions](/functions-and-operators/window-functions.md)

### tidb_enable_plan_cache_for_param_limit

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_plan_cache_for_param_limit-new-in-v660)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_enable_plan_cache_for_subquery

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_plan_cache_for_subquery-new-in-v700)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_enable_plan_replayer_capture

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_plan_replayer_capture)
- [Use PLAN REPLAYER to Save and Restore the On-Site Information of a Cluster](/sql-plan-replayer.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_enable_plan_replayer_continuous_capture

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_plan_replayer_continuous_capture-new-in-v700)
- [Use PLAN REPLAYER to Save and Restore the On-Site Information of a Cluster](/sql-plan-replayer.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_enable_point_get_cache

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_point_get_cache)

### tidb_enable_prepared_plan_cache

Referenced in:

- [How to Test TiDB Using Sysbench](/benchmark/benchmark-tidb-using-sysbench.md)
- [SQL Prepared Execution Plan Cache](/sql-prepared-plan-cache.md)
- [System Variables](/system-variables.md#tidb_enable_prepared_plan_cache-new-in-v610)
- [TiDB Cloud Release Notes in 2022](https://docs.pingcap.com/tidbcloud/release-notes-2022)
- [TiDB Dashboard FAQs](/dashboard/dashboard-faq.md)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)
- [TiDB 7.1.4 Release Notes](/releases/release-7.1.4.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_enable_prepared_plan_cache_memory_monitor

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_prepared_plan_cache_memory_monitor-new-in-v640)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_enable_pseudo_for_outdated_stats

Referenced in:

- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_enable_pseudo_for_outdated_stats-new-in-v530)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)

### tidb_enable_rate_limit_action

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_rate_limit_action)
- [TiDB Memory Control](/configure-memory-usage.md)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_enable_resource_control

Referenced in:

- [ALTER RESOURCE GROUP](/sql-statements/sql-statement-alter-resource-group.md)
- [CREATE RESOURCE GROUP](/sql-statements/sql-statement-create-resource-group.md)
- [DROP RESOURCE GROUP](/sql-statements/sql-statement-drop-resource-group.md)
- [Error Codes and Troubleshooting](/error-codes.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SET RESOURCE GROUP](/sql-statements/sql-statement-set-resource-group.md)
- [System Variables](/system-variables.md#tidb_enable_resource_control-new-in-v660)
- [TiKV Configuration File](/tikv-configuration-file.md)
- [Use Resource Control to Achieve Resource Group Limitation and Flow Control](/tidb-resource-control-ru-groups.md)
- [`CALIBRATE RESOURCE`](/sql-statements/sql-statement-calibrate-resource.md)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_enable_reuse_chunk

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_reuse_chunk-new-in-v640)
- [TiDB 6.5.1 Release Notes](/releases/release-6.5.1.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_enable_row_level_checksum

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_row_level_checksum-new-in-v710)
- [TiCDC Data Integrity Validation for Single-Row Data](/ticdc/ticdc-integrity-check.md)
- [TiDB Specific Functions](/functions-and-operators/tidb-functions.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### tidb_enable_shared_lock_promotion

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_shared_lock_promotion-new-in-v830)
- [TiDB Pessimistic Transaction Mode](/pessimistic-transaction.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)

### tidb_enable_slow_log

Referenced in:

- [Identify Slow Queries](/identify-slow-queries.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Modify Configuration Dynamically](/dynamic-config.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [Slow Queries Page of TiDB Dashboard](/dashboard/dashboard-slow-query.md)
- [System Variables](/system-variables.md#tidb_enable_slow_log)
- [TiDB Configuration File](/tidb-configuration-file.md)

### tidb_enable_stats_owner

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [System Variables](/system-variables.md#tidb_enable_stats_owner-new-in-v840)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)

### tidb_enable_stmt_summary

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL Plan Management (SPM)](/sql-plan-management.md)
- [Statement Summary Tables](/statement-summary-tables.md)
- [System Variables](/system-variables.md#tidb_enable_stmt_summary-new-in-v304)
- [TiDB 3.0.4 Release Notes](/releases/release-3.0.4.md)

### tidb_enable_strict_double_type_check

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_strict_double_type_check-new-in-v50)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_enable_table_partition

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_enable_table_partition)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 4.0.13 Release Notes](/releases/release-4.0.13.md)
- [TiDB 3.0.8 Release Notes](/releases/release-3.0.8.md)

### tidb_enable_telemetry

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_enable_telemetry-new-in-v402)
- [TiDB 8.1.0 Release Notes](/releases/release-8.1.0.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)
- [TiDB 6.5.1 Release Notes](/releases/release-6.5.1.md)
- [TiDB 6.1.5 Release Notes](/releases/release-6.1.5.md)

### tidb_enable_tiflash_read_for_write_stmt

Referenced in:

- [System Variables](/system-variables.md#tidb_enable_tiflash_read_for_write_stmt-new-in-v630)
- [Use TiDB to Read TiFlash Replicas](/tiflash/use-tidb-to-read-tiflash.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_enable_tmp_storage_on_oom

Referenced in:

- [Best Practices for Developing Java Applications with TiDB](/develop/java-app-best-practices.md)
- [Connection Pools and Connection Parameters](/develop/dev-guide-connection-parameters.md)
- [Enable Encryption for Disk Spill](/enable-disk-spill-encrypt.md)
- [Explain Statements That Use Joins](/explain-joins.md)
- [System Variables](/system-variables.md#tidb_enable_tmp_storage_on_oom)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Memory Control](/configure-memory-usage.md)

### tidb_enable_top_sql

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_enable_top_sql-new-in-v540)
- [TiDB Dashboard Top SQL Page](/dashboard/top-sql.md)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)

### tidb_enable_tso_follower_proxy

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [PD Microservices](/pd-microservices.md)
- [System Variables](/system-variables.md#tidb_enable_tso_follower_proxy-new-in-v530)
- [TiDB Features](/basic-features.md)
- [TiDB 8.5.2 Release Notes](/releases/release-8.5.2.md)
- [TiDB 8.5.1 Release Notes](/releases/release-8.5.1.md)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 7.5.7 Release Notes](/releases/release-7.5.7.md)
- [TiDB 7.5.6 Release Notes](/releases/release-7.5.6.md)
- [TiDB 6.5.12 Release Notes](/releases/release-6.5.12.md)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)

### tidb_enable_unsafe_substitute

Referenced in:

- [Generated Columns](/generated-columns.md)
- [System Variables](/system-variables.md#tidb_enable_unsafe_substitute-new-in-v630)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_enable_vectorized_expression

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_enable_vectorized_expression-new-in-v40)
- [TiDB 5.4.1 Release Notes](/releases/release-5.4.1.md)
- [TiDB 5.2.4 Release Notes](/releases/release-5.2.4.md)
- [TiDB 5.1.4 Release Notes](/releases/release-5.1.4.md)
- [TiDB 5.0.6 Release Notes](/releases/release-5.0.6.md)
- [TiDB 4.0.16 Release Notes](/releases/release-4.0.16.md)

### tidb_enable_window_function

Referenced in:

- [Keywords](/keywords.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_enable_window_function)
- [Window Functions](/functions-and-operators/window-functions.md)
- [TiDB 3.0.8 Release Notes](/releases/release-3.0.8.md)

### tidb_enforce_mpp

Referenced in:

- [Explore HTAP](/explore-htap.md)
- [System Variables](/system-variables.md#tidb_enforce_mpp-new-in-v51)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiFlash Query Result Materialization](/tiflash/tiflash-results-materialization.md)
- [Troubleshoot a TiFlash Cluster](/tiflash/troubleshoot-tiflash.md)
- [Tune TiFlash Performance](/tiflash/tune-tiflash-performance.md)
- [Usage Scenarios of Stale Read](/stale-read.md)
- [Use TiFlash MPP Mode](/tiflash/use-tiflash-mpp-mode.md)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)
- [TiDB 5.4.2 Release Notes](/releases/release-5.4.2.md)
- [TiDB 5.1.5 Release Notes](/releases/release-5.1.5.md)
- [TiDB 5.1 Release Notes](/releases/release-5.1.0.md)
- [TiDB 5.0.4 Release Notes](/releases/release-5.0.4.md)

### tidb_evolve_plan_baselines

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL Plan Management (SPM)](/sql-plan-management.md)
- [System Variables](/system-variables.md#tidb_evolve_plan_baselines-new-in-v40)
- [TiDB 5.2 Release Notes](/releases/release-5.2.0.md)

### tidb_evolve_plan_task_end_time

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL Plan Management (SPM)](/sql-plan-management.md)
- [System Variables](/system-variables.md#tidb_evolve_plan_task_end_time-new-in-v40)

### tidb_evolve_plan_task_max_time

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL Plan Management (SPM)](/sql-plan-management.md)
- [System Variables](/system-variables.md#tidb_evolve_plan_task_max_time-new-in-v40)

### tidb_evolve_plan_task_start_time

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL Plan Management (SPM)](/sql-plan-management.md)
- [System Variables](/system-variables.md#tidb_evolve_plan_task_start_time-new-in-v40)

### tidb_executor_concurrency

Referenced in:

- [System Variables](/system-variables.md#tidb_executor_concurrency-new-in-v50)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_expensive_query_time_threshold

Referenced in:

- [Identify Expensive Queries](/identify-expensive-queries.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Modify Configuration Dynamically](/dynamic-config.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_expensive_query_time_threshold)
- [TiDB Configuration File](/tidb-configuration-file.md)

### tidb_expensive_txn_time_threshold

Referenced in:

- [System Variables](/system-variables.md#tidb_expensive_txn_time_threshold-new-in-v720)
- [TiDB 7.2.0 Release Notes](/releases/release-7.2.0.md)

### tidb_external_ts

Referenced in:

- [DR Solution Based on Primary and Secondary Clusters](/dr-secondary-cluster.md)
- [Read Historical Data Using the `tidb_external_ts` Variable](/tidb-external-ts.md)
- [System Variables](/system-variables.md#tidb_external_ts-new-in-v640)
- [Upstream and Downstream Clusters Data Validation and Snapshot Read](/ticdc/ticdc-upstream-downstream-check.md)
- [Usage Scenarios of Stale Read](/stale-read.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_force_priority

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Modify Configuration Dynamically](/dynamic-config.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_force_priority)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB 2.1.5 Release Notes](/releases/release-2.1.5.md)
- [TiDB 2.1 RC3 Release Notes](/releases/release-2.1-rc.3.md)

### tidb_gc_concurrency

Referenced in:

- [Garbage Collection Configuration](/garbage-collection-configuration.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_gc_concurrency-new-in-v50)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_gc_enable

Referenced in:

- [DR Solution Based on Primary and Secondary Clusters](/dr-secondary-cluster.md)
- [Garbage Collection Configuration](/garbage-collection-configuration.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Migrate Data from TiDB to MySQL-compatible Databases](/migrate-from-tidb-to-mysql.md)
- [Migrate from One TiDB Cluster to Another TiDB Cluster](/migrate-from-tidb-to-tidb.md)
- [Migrate from TiDB Self-Managed to TiDB Cloud](https://docs.pingcap.com/tidbcloud/migrate-from-op-tidb)
- [Replicate Data Between Primary and Secondary Clusters](/replicate-between-primary-and-secondary-clusters.md)
- [System Variables](/system-variables.md#tidb_gc_enable-new-in-v50)
- [TiDB Troubleshooting Map](/tidb-troubleshooting-map.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_gc_life_time

Referenced in:

- [Error Codes and Troubleshooting](/error-codes.md)
- [FLASHBACK CLUSTER](/sql-statements/sql-statement-flashback-cluster.md)
- [FLASHBACK DATABASE](/sql-statements/sql-statement-flashback-database.md)
- [FLASHBACK TABLE](/sql-statements/sql-statement-flashback-table.md)
- [Garbage Collection Configuration](/garbage-collection-configuration.md)
- [Migrate and Upgrade a TiDB Cluster](/tidb-upgrade-migration-guide.md)
- [Read Historical Data Using the System Variable `tidb_snapshot`](/read-historical-data.md)
- [Replicate Data to Kafka](/ticdc/ticdc-sink-to-kafka.md)
- [SQL FAQs](/faq/sql-faq.md)
- [Sink to MySQL](https://docs.pingcap.com/tidbcloud/changefeed-sink-to-mysql)
- [Sink to TiDB Cloud](https://docs.pingcap.com/tidbcloud/changefeed-sink-to-tidb-cloud)
- [Stale Read](/develop/dev-guide-use-stale-read.md)
- [System Variables](/system-variables.md#tidb_gc_life_time-new-in-v50)
- [TiCDC FAQs](/ticdc/ticdc-faq.md)
- [TiDB Incremental Backup and Restore Guide](/br/br-incremental-guide.md)
- [TiDB Troubleshooting Map](/tidb-troubleshooting-map.md)
- [TiKV MVCC In-Memory Engine](/tikv-in-memory-engine.md)
- [Timeouts in TiDB](/develop/dev-guide-timeouts-in-tidb.md)
- [Use Dumpling to Export Data](/dumpling-overview.md)
- [TiDB 6.1.1 Release Notes](/releases/release-6.1.1.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_gc_max_wait_time

Referenced in:

- [Garbage Collection Configuration](/garbage-collection-configuration.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Pipelined DML](/pipelined-dml.md)
- [System Variables](/system-variables.md#tidb_gc_max_wait_time-new-in-v610)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_gc_run_interval

Referenced in:

- [Garbage Collection Configuration](/garbage-collection-configuration.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_gc_run_interval-new-in-v50)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_gc_scan_lock_mode

Referenced in:

- [GC Overview](/garbage-collection-overview.md)
- [Garbage Collection Configuration](/garbage-collection-configuration.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_gc_scan_lock_mode-new-in-v50)
- [TiDB Features](/basic-features.md)
- [TiDB 5.0.4 Release Notes](/releases/release-5.0.4.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_general_log

Referenced in:

- [Configuration Options](/command-line-flags-for-tidb-configuration.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_general_log)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Data Migration FAQs](/dm/dm-faq.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)

### tidb_generate_binary_plan

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_generate_binary_plan-new-in-v620)
- [TiDB Specific Functions](/functions-and-operators/tidb-functions.md)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tidb_gogc_tuner_max_value

Referenced in:

- [System Variables](/system-variables.md#tidb_gogc_tuner_max_value-new-in-v750)
- [TiDB 8.5.1 Release Notes](/releases/release-8.5.1.md)
- [TiDB 7.5.5 Release Notes](/releases/release-7.5.5.md)
- [TiDB 7.5.0 Release Notes](/releases/release-7.5.0.md)

### tidb_gogc_tuner_min_value

Referenced in:

- [System Variables](/system-variables.md#tidb_gogc_tuner_min_value-new-in-v750)
- [TiDB 8.5.1 Release Notes](/releases/release-8.5.1.md)
- [TiDB 7.5.5 Release Notes](/releases/release-7.5.5.md)
- [TiDB 7.5.0 Release Notes](/releases/release-7.5.0.md)

### tidb_gogc_tuner_threshold

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_gogc_tuner_threshold-new-in-v640)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 7.1.4 Release Notes](/releases/release-7.1.4.md)
- [TiDB 6.5.9 Release Notes](/releases/release-6.5.9.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_guarantee_linearizability

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_guarantee_linearizability-new-in-v50)

### tidb_hash_exchange_with_new_collation

Referenced in:

- [System Variables](/system-variables.md#tidb_hash_exchange_with_new_collation)

### tidb_hash_join_concurrency

Referenced in:

- [Analyze Slow Queries](/analyze-slow-queries.md)
- [Best Practices for Three-Node Hybrid Deployment](/best-practices/three-nodes-hybrid-deployment.md)
- [Explain Statements That Use Joins](/explain-joins.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_hash_join_concurrency)

### tidb_hash_join_version

Referenced in:

- [System Variables](/system-variables.md#tidb_hash_join_version-new-in-v840)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)

### tidb_hashagg_final_concurrency

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_hashagg_final_concurrency)

### tidb_hashagg_partial_concurrency

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_hashagg_partial_concurrency)

### tidb_historical_stats_duration

Referenced in:

- [System Variables](/system-variables.md#tidb_historical_stats_duration-new-in-v660)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_idle_transaction_timeout

Referenced in:

- [Connection Pools and Connection Parameters](/develop/dev-guide-connection-parameters.md)
- [System Variables](/system-variables.md#tidb_idle_transaction_timeout-new-in-v760)
- [TiDB Cluster Management FAQs](/faq/manage-cluster-faq.md)
- [TiDB Features](/basic-features.md)
- [Timeouts in TiDB](/develop/dev-guide-timeouts-in-tidb.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)

### tidb_ignore_inlist_plan_digest

Referenced in:

- [System Variables](/system-variables.md#tidb_ignore_inlist_plan_digest-new-in-v760)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)

### tidb_ignore_prepared_cache_close_stmt

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [Performance Analysis and Tuning](/performance-tuning-methods.md)
- [Performance Tuning Practices for OLTP Scenarios](/performance-tuning-practices.md)
- [SQL Prepared Execution Plan Cache](/sql-prepared-plan-cache.md)
- [System Variables](/system-variables.md#tidb_ignore_prepared_cache_close_stmt-new-in-v600)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)

### tidb_index_join_batch_size

Referenced in:

- [Explain Statements That Use Joins](/explain-joins.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_index_join_batch_size)

### tidb_index_join_double_read_penalty_cost_rate

Referenced in:

- [System Variables](/system-variables.md#tidb_index_join_double_read_penalty_cost_rate-new-in-v660)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_index_lookup_concurrency

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_index_lookup_concurrency)
- [TiDB Best Practices](/best-practices/tidb-best-practices.md)

### tidb_index_lookup_join_concurrency

Referenced in:

- [Best Practices for Three-Node Hybrid Deployment](/best-practices/three-nodes-hybrid-deployment.md)
- [Explain Statements That Use Joins](/explain-joins.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_index_lookup_join_concurrency)

### tidb_index_lookup_size

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_index_lookup_size)
- [TiDB Best Practices](/best-practices/tidb-best-practices.md)

### tidb_index_merge_intersection_concurrency

Referenced in:

- [System Variables](/system-variables.md#tidb_index_merge_intersection_concurrency-new-in-v650)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_index_serial_scan_concurrency

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_index_serial_scan_concurrency)
- [TiDB Best Practices](/best-practices/tidb-best-practices.md)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v6.5.6](https://docs.pingcap.com/tidbcloud/v6.5-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v7.1.3](https://docs.pingcap.com/tidbcloud/v7.1-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v7.5.0](https://docs.pingcap.com/tidbcloud/v7.5-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v8.1.0](https://docs.pingcap.com/tidbcloud/v8.1-performance-benchmarking-with-tpcc)
- [TiDB Cloud TPC-C Performance Test Report for TiDB v8.5.0](https://docs.pingcap.com/tidbcloud/v8.5-performance-benchmarking-with-tpcc)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)

### tidb_init_chunk_size

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_init_chunk_size)
- [TiDB Transaction Isolation Levels](/transaction-isolation-levels.md)
- [TiDB 3.0 Beta Release Notes](/releases/release-3.0-beta.md)

### tidb_instance_plan_cache_max_size

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [System Variables](/system-variables.md#tidb_instance_plan_cache_max_size-new-in-v840)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)

### tidb_instance_plan_cache_reserved_percentage

Referenced in:

- [System Variables](/system-variables.md#tidb_instance_plan_cache_reserved_percentage-new-in-v840)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)

### tidb_isolation_read_engines

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [Stress Test TiDB Using TiUP Bench Component](/tiup/tiup-bench.md)
- [System Variables](/system-variables.md#tidb_isolation_read_engines-new-in-v40)
- [TiFlash Compatibility Notes](/tiflash/tiflash-compatibility.md)
- [Use FastScan](/tiflash/use-fastscan.md)
- [Use TiDB to Read TiFlash Replicas](/tiflash/use-tidb-to-read-tiflash.md)
- [TiDB 8.5.4 Release Notes](/releases/release-8.5.4.md)
- [TiDB 4.0.2 Release Notes](/releases/release-4.0.2.md)

### tidb_last_ddl_info

Referenced in:

- [System Variables](/system-variables.md#tidb_last_ddl_info-new-in-v600)

### tidb_last_plan_replayer_token

Referenced in:

- [System Variables](/system-variables.md#tidb_last_plan_replayer_token-new-in-v630)
- [Use PLAN REPLAYER to Save and Restore the On-Site Information of a Cluster](/sql-plan-replayer.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_last_query_info

Referenced in:

- [System Variables](/system-variables.md#tidb_last_query_info-new-in-v4014)
- [Use Resource Control to Achieve Resource Group Limitation and Flow Control](/tidb-resource-control-ru-groups.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)

### tidb_last_txn_info

Referenced in:

- [Pipelined DML](/pipelined-dml.md)
- [System Variables](/system-variables.md#tidb_last_txn_info-new-in-v409)

### tidb_load_based_replica_read_threshold

Referenced in:

- [System Variables](/system-variables.md#tidb_load_based_replica_read_threshold-new-in-v700)
- [Troubleshoot Hotspot Issues](/troubleshoot-hot-spot-issues.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_load_binding_timeout

Referenced in:

- [System Variables](/system-variables.md#tidb_load_binding_timeout-new-in-v800)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)

### tidb_lock_unchanged_keys

Referenced in:

- [System Variables](/system-variables.md#tidb_lock_unchanged_keys-new-in-v711-and-v730)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)
- [TiDB 7.1.1 Release Notes](/releases/release-7.1.1.md)

### tidb_log_file_max_days

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_log_file_max_days-new-in-v530)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tidb_low_resolution_tso

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_low_resolution_tso)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 3.0.0-rc.2 Release Notes](/releases/release-3.0.0-rc.2.md)
- [TiDB 3.0 GA Release Notes](/releases/release-3.0-ga.md)

### tidb_low_resolution_tso_update_interval

Referenced in:

- [System Variables](/system-variables.md#tidb_low_resolution_tso_update_interval-new-in-v800)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)

### tidb_max_auto_analyze_time

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [System Variables](/system-variables.md#tidb_max_auto_analyze_time-new-in-v610)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_max_bytes_before_tiflash_external_group_by

Referenced in:

- [System Variables](/system-variables.md#tidb_max_bytes_before_tiflash_external_group_by-new-in-v700)
- [TiFlash Spill to Disk](/tiflash/tiflash-spill-disk.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_max_bytes_before_tiflash_external_join

Referenced in:

- [System Variables](/system-variables.md#tidb_max_bytes_before_tiflash_external_join-new-in-v700)
- [TiFlash Spill to Disk](/tiflash/tiflash-spill-disk.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_max_bytes_before_tiflash_external_sort

Referenced in:

- [System Variables](/system-variables.md#tidb_max_bytes_before_tiflash_external_sort-new-in-v700)
- [TiFlash Spill to Disk](/tiflash/tiflash-spill-disk.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_max_chunk_size

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_max_chunk_size)
- [TiDB Transaction Isolation Levels](/transaction-isolation-levels.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)
- [TiDB 7.1.3 Release Notes](/releases/release-7.1.3.md)
- [TiDB 6.5.7 Release Notes](/releases/release-6.5.7.md)
- [TiDB 2.0.9 Release Notes](/releases/release-2.0.9.md)

### tidb_max_delta_schema_count

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL FAQs](/faq/sql-faq.md)
- [System Variables](/system-variables.md#tidb_max_delta_schema_count-new-in-v2118-and-v305)
- [TiDB 3.0.5 Release Notes](/releases/release-3.0.5.md)
- [TiDB 2.1.18 Release Notes](/releases/release-2.1.18.md)

### tidb_max_paging_size

Referenced in:

- [System Variables](/system-variables.md#tidb_max_paging_size-new-in-v630)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_max_tiflash_threads

Referenced in:

- [Configure TiFlash](/tiflash/tiflash-configuration.md)
- [Modify Configuration Dynamically](/dynamic-config.md)
- [System Variables](/system-variables.md#tidb_max_tiflash_threads-new-in-v610)
- [TiDB Cloud Release Notes in 2022](https://docs.pingcap.com/tidbcloud/release-notes-2022)
- [Tune TiFlash Performance](/tiflash/tune-tiflash-performance.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_mem_oom_action

Referenced in:

- [Non-Transactional DML Statements](/non-transactional-dml.md)
- [System Variables](/system-variables.md#tidb_mem_oom_action-new-in-v610)
- [TiDB Cloud Release Notes in 2022](https://docs.pingcap.com/tidbcloud/release-notes-2022)
- [TiDB Memory Control](/configure-memory-usage.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_mem_quota_analyze

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [System Variables](/system-variables.md#tidb_mem_quota_analyze-new-in-v610)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [TiDB 8.1.0 Release Notes](/releases/release-8.1.0.md)
- [TiDB 7.5.2 Release Notes](/releases/release-7.5.2.md)
- [TiDB 7.1.6 Release Notes](/releases/release-7.1.6.md)
- [TiDB 6.5.10 Release Notes](/releases/release-6.5.10.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_mem_quota_apply_cache

Referenced in:

- [System Variables](/system-variables.md#tidb_mem_quota_apply_cache-new-in-v50)

### tidb_mem_quota_binding_cache

Referenced in:

- [SQL Plan Management (SPM)](/sql-plan-management.md)
- [System Variables](/system-variables.md#tidb_mem_quota_binding_cache-new-in-v600)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)

### tidb_mem_quota_query

Referenced in:

- [Enable Encryption for Disk Spill](/enable-disk-spill-encrypt.md)
- [Error Codes and Troubleshooting](/error-codes.md)
- [Explain Statements That Use Joins](/explain-joins.md)
- [Identify Expensive Queries](/identify-expensive-queries.md)
- [Non-Transactional DML Statements](/non-transactional-dml.md)
- [Optimizer Hints](/optimizer-hints.md)
- [Pipelined DML](/pipelined-dml.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_mem_quota_query)
- [TiDB Cloud Release Notes in 2022](https://docs.pingcap.com/tidbcloud/release-notes-2022)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Memory Control](/configure-memory-usage.md)
- [TiDB Troubleshooting Map](/tidb-troubleshooting-map.md)
- [TiFlash Query Result Materialization](/tiflash/tiflash-results-materialization.md)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 8.1.2 Release Notes](/releases/release-8.1.2.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)
- [TiDB 7.5.4 Release Notes](/releases/release-7.5.4.md)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)
- [TiDB 7.2.0 Release Notes](/releases/release-7.2.0.md)
- [TiDB 7.1.6 Release Notes](/releases/release-7.1.6.md)
- [TiDB 7.1.4 Release Notes](/releases/release-7.1.4.md)
- [TiDB 7.1.1 Release Notes](/releases/release-7.1.1.md)
- [TiDB 6.5.11 Release Notes](/releases/release-6.5.11.md)
- [TiDB 6.5.7 Release Notes](/releases/release-6.5.7.md)
- [TiDB 6.5.4 Release Notes](/releases/release-6.5.4.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)
- [TiDB 4.0.10 Release Notes](/releases/release-4.0.10.md)

### tidb_memory_debug_mode_alarm_ratio

Referenced in:

- [System Variables](/system-variables.md#tidb_memory_debug_mode_alarm_ratio)

### tidb_memory_debug_mode_min_heap_inuse

Referenced in:

- [System Variables](/system-variables.md#tidb_memory_debug_mode_min_heap_inuse)

### tidb_memory_usage_alarm_keep_record_num

Referenced in:

- [System Variables](/system-variables.md#tidb_memory_usage_alarm_keep_record_num-new-in-v640)
- [TiDB Memory Control](/configure-memory-usage.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_memory_usage_alarm_ratio

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_memory_usage_alarm_ratio)
- [TiDB Memory Control](/configure-memory-usage.md)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_merge_join_concurrency

Referenced in:

- [System Variables](/system-variables.md#tidb_merge_join_concurrency)

### tidb_merge_partition_stats_concurrency

Referenced in:

- [System Variables](/system-variables.md#tidb_merge_partition_stats_concurrency)
- [TiDB 7.5.0 Release Notes](/releases/release-7.5.0.md)
- [TiDB 7.1.4 Release Notes](/releases/release-7.1.4.md)
- [TiDB 6.5.9 Release Notes](/releases/release-6.5.9.md)

### tidb_metric_query_range_duration

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Metrics Schema](/metrics-schema.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_metric_query_range_duration-new-in-v40)

### tidb_metric_query_step

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Metrics Schema](/metrics-schema.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_metric_query_step-new-in-v40)

### tidb_min_paging_size

Referenced in:

- [System Variables](/system-variables.md#tidb_min_paging_size-new-in-v620)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tidb_mpp_store_fail_ttl

Referenced in:

- [System Variables](/system-variables.md#tidb_mpp_store_fail_ttl)
- [TiDB 8.5.4 Release Notes](/releases/release-8.5.4.md)

### tidb_multi_statement_mode

Referenced in:

- [Error Codes and Troubleshooting](/error-codes.md)
- [Integrate TiDB Cloud with n8n](https://docs.pingcap.com/tidbcloud/integrate-tidbcloud-with-n8n)
- [System Variables](/system-variables.md#tidb_multi_statement_mode-new-in-v4011)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)
- [TiDB 7.1.4 Release Notes](/releases/release-7.1.4.md)
- [TiDB 6.5.8 Release Notes](/releases/release-6.5.8.md)
- [TiDB 5.2 Release Notes](/releases/release-5.2.0.md)
- [TiDB 5.1.1 Release Notes](/releases/release-5.1.1.md)
- [TiDB 5.0.3 Release Notes](/releases/release-5.0.3.md)
- [TiDB 4.0.14 Release Notes](/releases/release-4.0.14.md)

### tidb_non_prepared_plan_cache_size

Referenced in:

- [System Variables](/system-variables.md#tidb_non_prepared_plan_cache_size)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_nontransactional_ignore_error

Referenced in:

- [Non-Transactional DML Statements](/non-transactional-dml.md)
- [System Variables](/system-variables.md#tidb_nontransactional_ignore_error-new-in-v610)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_opt_advanced_join_hint

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_advanced_join_hint-new-in-v700)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_opt_agg_push_down

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_agg_push_down)
- [Tune TiFlash Performance](/tiflash/tune-tiflash-performance.md)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)
- [TiDB 7.1.1 Release Notes](/releases/release-7.1.1.md)
- [TiDB 6.5.4 Release Notes](/releases/release-6.5.4.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)
- [TiDB 6.1.7 Release Notes](/releases/release-6.1.7.md)
- [TiDB 5.4.2 Release Notes](/releases/release-5.4.2.md)
- [TiDB 5.1.5 Release Notes](/releases/release-5.1.5.md)
- [TiDB 4.0 GA Release Notes](/releases/release-4.0-ga.md)

### tidb_opt_broadcast_cartesian_join

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_broadcast_cartesian_join)

### tidb_opt_concurrency_factor

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_concurrency_factor)

### tidb_opt_copcpu_factor

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_copcpu_factor)

### tidb_opt_correlation_exp_factor

Referenced in:

- [Introduction to Extended Statistics](/extended-statistics.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_correlation_exp_factor)
- [TiDB 3.0.0-rc.1 Release Notes](/releases/release-3.0.0-rc.1.md)

### tidb_opt_correlation_threshold

Referenced in:

- [Introduction to Extended Statistics](/extended-statistics.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_correlation_threshold)

### tidb_opt_cpu_factor

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_cpu_factor)

### tidb_opt_derive_topn

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [Derive TopN or Limit from Window Functions](/derive-topn-from-window.md)
- [System Variables](/system-variables.md#tidb_opt_derive_topn-new-in-v700)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_opt_desc_factor

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_desc_factor)

### tidb_opt_disk_factor

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_disk_factor)

### tidb_opt_distinct_agg_push_down

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [Distinct Optimization](/agg-distinct-optimization.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_distinct_agg_push_down)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [Tune TiFlash Performance](/tiflash/tune-tiflash-performance.md)

### tidb_opt_enable_correlation_adjustment

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_enable_correlation_adjustment)
- [TiDB 5.2 Release Notes](/releases/release-5.2.0.md)

### tidb_opt_enable_fuzzy_binding

Referenced in:

- [SQL Plan Management (SPM)](/sql-plan-management.md)
- [System Variables](/system-variables.md#tidb_opt_enable_fuzzy_binding-new-in-v760)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)

### tidb_opt_enable_hash_join

Referenced in:

- [Optimizer Hints](/optimizer-hints.md)
- [System Variables](/system-variables.md#tidb_opt_enable_hash_join-new-in-v656-v712-and-v740)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)
- [TiDB 7.1.2 Release Notes](/releases/release-7.1.2.md)
- [TiDB 6.5.6 Release Notes](/releases/release-6.5.6.md)

### tidb_opt_enable_late_materialization

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_enable_late_materialization-new-in-v700)
- [TiFlash Late Materialization](/tiflash/tiflash-late-materialization.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_opt_enable_mpp_shared_cte_execution

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [System Variables](/system-variables.md#tidb_opt_enable_mpp_shared_cte_execution-new-in-v720)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)

### tidb_opt_enable_no_decorrelate_in_select

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_enable_no_decorrelate_in_select-new-in-v854)
- [TiDB 8.5.4 Release Notes](/releases/release-8.5.4.md)

### tidb_opt_enable_non_eval_scalar_subquery

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_enable_non_eval_scalar_subquery-new-in-v730)
- [`EXPLAIN`](/sql-statements/sql-statement-explain.md)
- [`EXPLAIN` Walkthrough](/explain-walkthrough.md)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)

### tidb_opt_enable_semi_join_rewrite

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_enable_semi_join_rewrite-new-in-v854)
- [TiDB 8.5.4 Release Notes](/releases/release-8.5.4.md)

### tidb_opt_fix_control

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [Control Execution Plan](/control-execution-plan.md)
- [Optimizer Fix Controls](/optimizer-fix-controls.md)
- [SQL Non-Prepared Execution Plan Cache](/sql-non-prepared-plan-cache.md)
- [System Variables](/system-variables.md#tidb_opt_fix_control-new-in-v653-and-v710)
- [TiDB 7.2.0 Release Notes](/releases/release-7.2.0.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### tidb_opt_force_inline_cte

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_force_inline_cte-new-in-v630)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_opt_hash_agg_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_hash_agg_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_hash_join_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_hash_join_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_index_join_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_index_join_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_index_lookup_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_index_lookup_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_index_merge_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_index_merge_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_index_reader_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_index_reader_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_index_scan_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_index_scan_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_insubq_to_join_and_agg

Referenced in:

- [Optimizer Hints](/optimizer-hints.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [Subquery Related Optimizations](/subquery-optimization.md)
- [System Variables](/system-variables.md#tidb_opt_insubq_to_join_and_agg)
- [TiDB 3.0 Beta Release Notes](/releases/release-3.0-beta.md)

### tidb_opt_join_reorder_threshold

Referenced in:

- [Introduction to Join Reorder](/join-reorder.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_join_reorder_threshold)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)
- [TiDB 3.0.0-rc.1 Release Notes](/releases/release-3.0.0-rc.1.md)

### tidb_opt_limit_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_limit_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_limit_push_down_threshold

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [System Variables](/system-variables.md#tidb_opt_limit_push_down_threshold)
- [TiDB 5.2 Release Notes](/releases/release-5.2.0.md)

### tidb_opt_memory_factor

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_memory_factor)

### tidb_opt_merge_join_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_merge_join_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_mpp_outer_join_fixed_build_side

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_mpp_outer_join_fixed_build_side-new-in-v510)

### tidb_opt_network_factor

Referenced in:

- [Index Selection](/choose-index.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_network_factor)

### tidb_opt_objective

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_objective-new-in-v740)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 7.5.2 Release Notes](/releases/release-7.5.2.md)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)

### tidb_opt_ordering_index_selectivity_ratio

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_ordering_index_selectivity_ratio-new-in-v800)
- [TiDB 8.5.4 Release Notes](/releases/release-8.5.4.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)

### tidb_opt_ordering_index_selectivity_threshold

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_ordering_index_selectivity_threshold-new-in-v700)
- [TiDB 7.5.7 Release Notes](/releases/release-7.5.7.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_opt_prefer_range_scan

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_prefer_range_scan-new-in-v50)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)

### tidb_opt_prefix_index_single_scan

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_prefix_index_single_scan-new-in-v640)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_opt_projection_push_down

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_projection_push_down-new-in-v610)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)

### tidb_opt_range_max_size

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_range_max_size-new-in-v640)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_opt_scan_factor

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_scan_factor)

### tidb_opt_seek_factor

Referenced in:

- [Index Selection](/choose-index.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_seek_factor)

### tidb_opt_skew_distinct_agg

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_skew_distinct_agg-new-in-v620)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tidb_opt_sort_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_sort_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_stream_agg_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_stream_agg_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_table_full_scan_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_table_full_scan_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_table_range_scan_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_table_range_scan_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_table_reader_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_table_reader_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_table_rowid_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_table_rowid_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_table_tiflash_scan_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_table_tiflash_scan_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_three_stage_distinct_agg

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_three_stage_distinct_agg-new-in-v630)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_opt_tiflash_concurrency_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_tiflash_concurrency_factor)

### tidb_opt_topn_cost_factor

Referenced in:

- [System Variables](/system-variables.md#tidb_opt_topn_cost_factor-new-in-v853)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)

### tidb_opt_use_invisible_indexes

Referenced in:

- [ALTER INDEX](/sql-statements/sql-statement-alter-index.md)
- [CREATE INDEX](/sql-statements/sql-statement-create-index.md)
- [Database Schema](https://docs.pingcap.com/tidbcloud/database-schema-concepts)
- [System Variables](/system-variables.md#tidb_opt_use_invisible_indexes-new-in-v800)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)

### tidb_opt_write_row_id

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_opt_write_row_id)
- [TiDB 2.1 RC5 Release Notes](/releases/release-2.1-rc.5.md)

### tidb_optimizer_selectivity_level

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_optimizer_selectivity_level)

### tidb_partition_prune_mode

Referenced in:

- [Partitioning](/partitioned-table.md)
- [SQL Prepared Execution Plan Cache](/sql-prepared-plan-cache.md)
- [System Variables](/system-variables.md#tidb_partition_prune_mode-new-in-v51)
- [TiFlash Upgrade Guide](/tiflash-upgrade-guide.md)
- [Use TiFlash MPP Mode](/tiflash/use-tiflash-mpp-mode.md)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.1.0 Release Notes](/releases/release-8.1.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)
- [TiDB 5.1 Release Notes](/releases/release-5.1.0.md)

### tidb_persist_analyze_options

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [System Variables](/system-variables.md#tidb_persist_analyze_options-new-in-v540)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)

### tidb_pessimistic_txn_fair_locking

Referenced in:

- [System Variables](/system-variables.md#tidb_pessimistic_txn_fair_locking-new-in-v700)
- [Troubleshoot Lock Conflicts](/troubleshoot-lock-conflicts.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_placement_mode

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_placement_mode-new-in-v600)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)

### tidb_plan_cache_invalidation_on_fresh_stats

Referenced in:

- [System Variables](/system-variables.md#tidb_plan_cache_invalidation_on_fresh_stats-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### tidb_plan_cache_max_plan_size

Referenced in:

- [SQL Non-Prepared Execution Plan Cache](/sql-non-prepared-plan-cache.md)
- [SQL Prepared Execution Plan Cache](/sql-prepared-plan-cache.md)
- [System Variables](/system-variables.md#tidb_plan_cache_max_plan_size-new-in-v710)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### tidb_pprof_sql_cpu

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_pprof_sql_cpu-new-in-v40)
- [TiDB 3.0.10 Release Notes](/releases/release-3.0.10.md)

### tidb_pre_split_regions

Referenced in:

- [System Variables](/system-variables.md#tidb_pre_split_regions-new-in-v840)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)

### tidb_prefer_broadcast_join_by_exchange_data_size

Referenced in:

- [System Variables](/system-variables.md#tidb_prefer_broadcast_join_by_exchange_data_size-new-in-v710)
- [Use TiFlash MPP Mode](/tiflash/use-tiflash-mpp-mode.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### tidb_prepared_plan_cache_memory_guard_ratio

Referenced in:

- [SQL Prepared Execution Plan Cache](/sql-prepared-plan-cache.md)
- [System Variables](/system-variables.md#tidb_prepared_plan_cache_memory_guard_ratio-new-in-v610)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_prepared_plan_cache_size

Referenced in:

- [System Variables](/system-variables.md#tidb_prepared_plan_cache_size-new-in-v610)
- [TiDB Cloud Release Notes in 2022](https://docs.pingcap.com/tidbcloud/release-notes-2022)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_projection_concurrency

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_projection_concurrency)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_query_log_max_len

Referenced in:

- [Identify Slow Queries](/identify-slow-queries.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_query_log_max_len)
- [TiDB Cloud Release Notes in 2022](https://docs.pingcap.com/tidbcloud/release-notes-2022)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)
- [TiDB 2.1 GA Release Notes](/releases/release-2.1-ga.md)
- [TiDB 2.1 RC5 Release Notes](/releases/release-2.1-rc.5.md)

### tidb_rc_read_check_ts

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [Performance Tuning Practices for OLTP Scenarios](/performance-tuning-practices.md)
- [System Variables](/system-variables.md#tidb_rc_read_check_ts-new-in-v600)
- [TiDB Transaction Isolation Levels](/transaction-isolation-levels.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)

### tidb_rc_write_check_ts

Referenced in:

- [System Variables](/system-variables.md#tidb_rc_write_check_ts-new-in-v630)
- [TiDB Transaction Isolation Levels](/transaction-isolation-levels.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tidb_read_consistency

Referenced in:

- [System Variables](/system-variables.md#tidb_read_consistency-new-in-v540)

### tidb_read_staleness

Referenced in:

- [Read Historical Data Using the `tidb_read_staleness` System Variable](/tidb-read-staleness.md)
- [Stale Read](/develop/dev-guide-use-stale-read.md)
- [System Variables](/system-variables.md#tidb_read_staleness-new-in-v540)
- [Usage Scenarios of Stale Read](/stale-read.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)

### tidb_record_plan_in_slow_log

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Modify Configuration Dynamically](/dynamic-config.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_record_plan_in_slow_log)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB 3.0.5 Release Notes](/releases/release-3.0.5.md)

### tidb_redact_log

Referenced in:

- [Configuration Options](/command-line-flags-for-tidb-configuration.md)
- [Identify Slow Queries](/identify-slow-queries.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Log Redaction](/log-redaction.md)
- [Non-Transactional DML Statements](/non-transactional-dml.md)
- [System Variables](/system-variables.md#tidb_redact_log)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 8.1.1 Release Notes](/releases/release-8.1.1.md)
- [TiDB 8.1.0 Release Notes](/releases/release-8.1.0.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 7.5.4 Release Notes](/releases/release-7.5.4.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)
- [TiDB 5.0 RC Release Notes](/releases/release-5.0.0-rc.md)

### tidb_regard_null_as_point

Referenced in:

- [System Variables](/system-variables.md#tidb_regard_null_as_point-new-in-v540)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)

### tidb_remove_orderby_in_subquery

Referenced in:

- [System Variables](/system-variables.md#tidb_remove_orderby_in_subquery-new-in-v610)
- [TiDB 7.2.0 Release Notes](/releases/release-7.2.0.md)

### tidb_replica_read

Referenced in:

- [Best Practices for Local Reads in Three-Data-Center Deployments](/best-practices/three-dc-local-read.md)
- [Best Practices for Read-Only Storage Nodes](/best-practices/readonly-nodes.md)
- [Follower Read](/follower-read.md)
- [Follower Read](/develop/dev-guide-use-follower-read.md)
- [Optimizer Hints](/optimizer-hints.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_replica_read-new-in-v40)
- [TiDB Best Practices on Public Cloud](/best-practices/best-practices-on-public-cloud.md)
- [TiDB 8.5.4 Release Notes](/releases/release-8.5.4.md)
- [TiDB 8.5.3 Release Notes](/releases/release-8.5.3.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)
- [TiDB 4.0.2 Release Notes](/releases/release-4.0.2.md)
- [TiDB 3.1 Beta.2 Release Notes](/releases/release-3.1.0-beta.2.md)

### tidb_request_source_type

Referenced in:

- [System Variables](/system-variables.md#tidb_request_source_type-new-in-v740)
- [Use Resource Control to Manage Background Tasks](/tidb-resource-control-background-tasks.md)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)

### tidb_resource_control_strict_mode

Referenced in:

- [Optimizer Hints](/optimizer-hints.md)
- [Privilege Management](/privilege-management.md)
- [SET RESOURCE GROUP](/sql-statements/sql-statement-set-resource-group.md)
- [System Variables](/system-variables.md#tidb_resource_control_strict_mode-new-in-v820)
- [Use Resource Control to Achieve Resource Group Limitation and Flow Control](/tidb-resource-control-ru-groups.md)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)

### tidb_restricted_read_only

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Privilege Management](/privilege-management.md)
- [Replicate Data to MySQL-compatible Databases](/ticdc/ticdc-sink-to-mysql.md)
- [System Variables](/system-variables.md#tidb_restricted_read_only-new-in-v520)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 5.4.1 Release Notes](/releases/release-5.4.1.md)
- [TiDB 5.3.1 Release Notes](/releases/release-5.3.1.md)

### tidb_retry_limit

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_retry_limit)
- [TiDB Optimistic Transaction Model](/optimistic-transaction.md)
- [TiDB Pessimistic Transaction Mode](/pessimistic-transaction.md)
- [Transactions](/transaction-overview.md)
- [Troubleshoot Lock Conflicts](/troubleshoot-lock-conflicts.md)
- [TiDB 2.1 Beta Release Notes](/releases/release-2.1-beta.md)
- [TiDB 2.1 GA Release Notes](/releases/release-2.1-ga.md)

### tidb_row_format_version

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_row_format_version)
- [TiDB 4.0.13 Release Notes](/releases/release-4.0.13.md)

### tidb_runtime_filter_mode

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [Runtime Filter](/runtime-filter.md)
- [System Variables](/system-variables.md#tidb_runtime_filter_mode-new-in-v720)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)

### tidb_runtime_filter_type

Referenced in:

- [Runtime Filter](/runtime-filter.md)
- [System Variables](/system-variables.md#tidb_runtime_filter_type-new-in-v720)

### tidb_scatter_region

Referenced in:

- [Best Practices for High-Concurrency Writes](/best-practices/high-concurrency-best-practices.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [Split Region](/sql-statements/sql-statement-split-region.md)
- [System Variables](/system-variables.md#tidb_scatter_region)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 6.1.7 Release Notes](/releases/release-6.1.7.md)
- [TiDB 2.1.15 Release Notes](/releases/release-2.1.15.md)

### tidb_schema_cache_size

Referenced in:

- [Best Practices for Handling Millions of Tables in SaaS Multi-Tenant Scenarios](/best-practices/saas-best-practices.md)
- [Schema Cache](/schema-cache.md)
- [System Variables](/system-variables.md#tidb_schema_cache_size-new-in-v800)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)

### tidb_schema_version_cache_limit

Referenced in:

- [Best Practices for Handling Millions of Tables in SaaS Multi-Tenant Scenarios](/best-practices/saas-best-practices.md)
- [System Variables](/system-variables.md#tidb_schema_version_cache_limit-new-in-v740)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)

### tidb_server_memory_limit

Referenced in:

- [IMPORT INTO](/sql-statements/sql-statement-import-into.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [MEMORY_USAGE](/information-schema/information-schema-memory-usage.md)
- [MEMORY_USAGE_OPS_HISTORY](/information-schema/information-schema-memory-usage-ops-history.md)
- [System Variables](/system-variables.md#tidb_server_memory_limit-new-in-v640)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Memory Control](/configure-memory-usage.md)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)
- [TiDB 7.1.4 Release Notes](/releases/release-7.1.4.md)
- [TiDB 7.1.3 Release Notes](/releases/release-7.1.3.md)
- [TiDB 6.5.9 Release Notes](/releases/release-6.5.9.md)
- [TiDB 6.5.7 Release Notes](/releases/release-6.5.7.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_server_memory_limit_gc_trigger

Referenced in:

- [IMPORT INTO](/sql-statements/sql-statement-import-into.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_server_memory_limit_gc_trigger-new-in-v640)
- [TiDB Memory Control](/configure-memory-usage.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_server_memory_limit_sess_min_size

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_server_memory_limit_sess_min_size-new-in-v640)
- [TiDB 6.5.2 Release Notes](/releases/release-6.5.2.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)

### tidb_service_scope

Referenced in:

- [ADMIN SHOW DDL [JOBS|JOB QUERIES]](/sql-statements/sql-statement-admin-show-ddl.md)
- [Configuration Options](/command-line-flags-for-tidb-configuration.md)
- [IMPORT INTO vs. TiDB Lightning](/tidb-lightning/import-into-vs-tidb-lightning.md)
- [System Variables](/system-variables.md#tidb_service_scope-new-in-v740)
- [TiDB Distributed eXecution Framework (DXF)](/tidb-distributed-execution-framework.md)
- [TiDB Features](/basic-features.md)
- [TiDB Global Sort](/tidb-global-sort.md)
- [TiDB 8.1.0 Release Notes](/releases/release-8.1.0.md)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)
- [TiDB 7.5.0 Release Notes](/releases/release-7.5.0.md)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)

### tidb_session_alias

Referenced in:

- [System Variables](/system-variables.md#tidb_session_alias-new-in-v740)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)

### tidb_session_plan_cache_size

Referenced in:

- [SQL Non-Prepared Execution Plan Cache](/sql-non-prepared-plan-cache.md)
- [SQL Prepared Execution Plan Cache](/sql-prepared-plan-cache.md)
- [System Variables](/system-variables.md#tidb_session_plan_cache_size-new-in-v710)
- [TiDB Cloud Sysbench Performance Test Report for TiDB v8.1.0](https://docs.pingcap.com/tidbcloud/v8.1-performance-benchmarking-with-sysbench)
- [TiDB Cloud Sysbench Performance Test Report for TiDB v8.5.0](https://docs.pingcap.com/tidbcloud/v8.5-performance-benchmarking-with-sysbench)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)

### tidb_shard_allocate_step

Referenced in:

- [System Variables](/system-variables.md#tidb_shard_allocate_step-new-in-v50)

### tidb_shard_row_id_bits

Referenced in:

- [System Variables](/system-variables.md#tidb_shard_row_id_bits-new-in-v840)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)

### tidb_simplified_metrics

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_simplified_metrics)

### tidb_skip_ascii_check

Referenced in:

- [System Variables](/system-variables.md#tidb_skip_ascii_check-new-in-v50)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)

### tidb_skip_isolation_level_check

Referenced in:

- [Error Codes and Troubleshooting](/error-codes.md)
- [Known Incompatibility Issues with Third-Party Tools](/develop/dev-guide-third-party-tools-compatibility.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_skip_isolation_level_check)
- [Transaction overview](/develop/dev-guide-transaction-overview.md)
- [TiDB 5.1.4 Release Notes](/releases/release-5.1.4.md)
- [TiDB 3.0.0-rc.1 Release Notes](/releases/release-3.0.0-rc.1.md)
- [TiDB 3.0 GA Release Notes](/releases/release-3.0-ga.md)

### tidb_skip_missing_partition_stats

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [System Variables](/system-variables.md#tidb_skip_missing_partition_stats-new-in-v730)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)

### tidb_skip_utf8_check

Referenced in:

- [Character Set and Collation](/character-set-and-collation.md)
- [DM Advanced Task Configuration File](/dm/task-configuration-file-full.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_skip_utf8_check)
- [TiDB Troubleshooting Map](/tidb-troubleshooting-map.md)
- [Upgrade and After Upgrade FAQs](/faq/upgrade-faq.md)

### tidb_slow_log_threshold

Referenced in:

- [A Practical Guide for SQL Tuning](/sql-tuning-best-practice.md)
- [Identify Slow Queries](/identify-slow-queries.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Modify Configuration Dynamically](/dynamic-config.md)
- [Overview Page](/dashboard/dashboard-overview.md)
- [Quick Start with TiDB Self-Managed](/quick-start-with-tidb.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [Slow Queries Page of TiDB Dashboard](/dashboard/dashboard-slow-query.md)
- [System Variables](/system-variables.md#tidb_slow_log_threshold)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Deployment FAQs](/faq/deploy-and-maintain-faq.md)
- [TiDB 2.1 GA Release Notes](/releases/release-2.1-ga.md)
- [TiDB 2.1 RC5 Release Notes](/releases/release-2.1-rc.5.md)

### tidb_slow_query_file

Referenced in:

- [Identify Slow Queries](/identify-slow-queries.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_slow_query_file)

### tidb_slow_txn_log_threshold

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_slow_txn_log_threshold-new-in-v700)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_snapshot

Referenced in:

- [Cached Tables](/cached-tables.md)
- [FLASHBACK CLUSTER](/sql-statements/sql-statement-flashback-cluster.md)
- [FLUSH TABLES](/sql-statements/sql-statement-flush-tables.md)
- [IMPORT INTO](/sql-statements/sql-statement-import-into.md)
- [Non-Transactional DML Statements](/non-transactional-dml.md)
- [Read Historical Data Using the System Variable `tidb_snapshot`](/read-historical-data.md)
- [Replicate Data to Kafka](/ticdc/ticdc-sink-to-kafka.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_snapshot)
- [Temporary Tables](/temporary-tables.md)
- [TiDB Features](/basic-features.md)
- [Use Dumpling to Export Data](/dumpling-overview.md)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)
- [TiDB 5.2.2 Release Notes](/releases/release-5.2.2.md)
- [TiDB 5.2 Release Notes](/releases/release-5.2.0.md)
- [TiDB 5.1.5 Release Notes](/releases/release-5.1.5.md)
- [TiDB 5.0.3 Release Notes](/releases/release-5.0.3.md)
- [TiDB 4.0.12 Release Notes](/releases/release-4.0.12.md)
- [TiDB 4.0.11 Release Notes](/releases/release-4.0.11.md)
- [TiDB 4.0.5 Release Notes](/releases/release-4.0.5.md)
- [TiDB 3.0.11 Release Notes](/releases/release-3.0.11.md)
- [TiDB 2.1.11 Release Notes](/releases/release-2.1.11.md)
- [TiDB 2.1.10 Release Notes](/releases/release-2.1.10.md)
- [TiDB 2.0.4 Release Notes](/releases/release-2.0.4.md)

### tidb_source_id

Referenced in:

- [System Variables](/system-variables.md#tidb_source_id-new-in-v650)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_stats_cache_mem_quota

Referenced in:

- [Best Practices for Handling Millions of Tables in SaaS Multi-Tenant Scenarios](/best-practices/saas-best-practices.md)
- [System Variables](/system-variables.md#tidb_stats_cache_mem_quota-new-in-v610)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [TiDB 8.5.1 Release Notes](/releases/release-8.5.1.md)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)
- [TiDB 6.1.0 Release Notes](/releases/release-6.1.0.md)

### tidb_stats_load_pseudo_timeout

Referenced in:

- [Introduction to Statistics](/statistics.md)
- [System Variables](/system-variables.md#tidb_stats_load_pseudo_timeout-new-in-v540)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)

### tidb_stats_load_sync_wait

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [Introduction to Statistics](/statistics.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_stats_load_sync_wait-new-in-v540)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 6.4.0 Release Notes](/releases/release-6.4.0.md)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)

### tidb_stats_update_during_ddl

Referenced in:

- [System Variables](/system-variables.md#tidb_stats_update_during_ddl-new-in-v854)
- [`ANALYZE` Embedded in DDL Statements](/ddl_embedded_analyze.md)
- [TiDB 8.5.4 Release Notes](/releases/release-8.5.4.md)

### tidb_stmt_summary_enable_persistent

Referenced in:

- [Statement Summary Tables](/statement-summary-tables.md)
- [System Variables](/system-variables.md#tidb_stmt_summary_enable_persistent-new-in-v660)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_stmt_summary_file_max_backups

Referenced in:

- [Statement Summary Tables](/statement-summary-tables.md)
- [System Variables](/system-variables.md#tidb_stmt_summary_file_max_backups-new-in-v660)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_stmt_summary_file_max_days

Referenced in:

- [Statement Summary Tables](/statement-summary-tables.md)
- [System Variables](/system-variables.md#tidb_stmt_summary_file_max_days-new-in-v660)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_stmt_summary_file_max_size

Referenced in:

- [Statement Summary Tables](/statement-summary-tables.md)
- [System Variables](/system-variables.md#tidb_stmt_summary_file_max_size-new-in-v660)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_stmt_summary_filename

Referenced in:

- [Statement Summary Tables](/statement-summary-tables.md)
- [System Variables](/system-variables.md#tidb_stmt_summary_filename-new-in-v660)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)

### tidb_stmt_summary_history_size

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [Statement Summary Tables](/statement-summary-tables.md)
- [System Variables](/system-variables.md#tidb_stmt_summary_history_size-new-in-v40)

### tidb_stmt_summary_internal_query

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [Statement Summary Tables](/statement-summary-tables.md)
- [System Variables](/system-variables.md#tidb_stmt_summary_internal_query-new-in-v40)

### tidb_stmt_summary_max_sql_length

Referenced in:

- [CREATE [GLOBAL|SESSION] BINDING](/sql-statements/sql-statement-create-binding.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SLOW_QUERY](/information-schema/information-schema-slow-query.md)
- [Slow Queries Page of TiDB Dashboard](/dashboard/dashboard-slow-query.md)
- [Statement Summary Tables](/statement-summary-tables.md)
- [System Variables](/system-variables.md#tidb_stmt_summary_max_sql_length-new-in-v40)

### tidb_stmt_summary_max_stmt_count

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL Statements Page of TiDB Dashboard](/dashboard/dashboard-statement-list.md)
- [Statement Summary Tables](/statement-summary-tables.md)
- [System Variables](/system-variables.md#tidb_stmt_summary_max_stmt_count-new-in-v40)
- [TiDB 5.2 Release Notes](/releases/release-5.2.0.md)
- [TiDB 5.1.1 Release Notes](/releases/release-5.1.1.md)
- [TiDB 5.0.4 Release Notes](/releases/release-5.0.4.md)
- [TiDB 4.0.14 Release Notes](/releases/release-4.0.14.md)

### tidb_stmt_summary_refresh_interval

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [Statement Summary Tables](/statement-summary-tables.md)
- [System Variables](/system-variables.md#tidb_stmt_summary_refresh_interval-new-in-v40)

### tidb_store_batch_size

Referenced in:

- [System Variables](/system-variables.md#tidb_store_batch_size)
- [TiDB 7.1.0 Release Notes](/releases/release-7.1.0.md)
- [TiDB 6.6.0 Release Notes](/releases/release-6.6.0.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_store_limit

Referenced in:

- [Error Codes and Troubleshooting](/error-codes.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_store_limit-new-in-v304-and-v40)
- [TiDB 5.4 Release Notes](/releases/release-5.4.0.md)

### tidb_streamagg_concurrency

Referenced in:

- [System Variables](/system-variables.md#tidb_streamagg_concurrency)

### tidb_super_read_only

Referenced in:

- [Migrate and Upgrade a TiDB Cluster](/tidb-upgrade-migration-guide.md)
- [System Variables](/system-variables.md#tidb_super_read_only-new-in-v531)
- [TiDB 5.4.1 Release Notes](/releases/release-5.4.1.md)
- [TiDB 5.3.1 Release Notes](/releases/release-5.3.1.md)

### tidb_sysdate_is_now

Referenced in:

- [System Variables](/system-variables.md#tidb_sysdate_is_now-new-in-v600)
- [TiDB 8.0.0 Release Notes](/releases/release-8.0.0.md)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)

### tidb_sysproc_scan_concurrency

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_sysproc_scan_concurrency-new-in-v650)
- [TiDB 8.2.0 Release Notes](/releases/release-8.2.0.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_table_cache_lease

Referenced in:

- [Cached Tables](/cached-tables.md)
- [System Variables](/system-variables.md#tidb_table_cache_lease-new-in-v600)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)

### tidb_tmp_table_max_size

Referenced in:

- [System Variables](/system-variables.md#tidb_tmp_table_max_size-new-in-v530)
- [Temporary Tables](/temporary-tables.md)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)

### tidb_top_sql_max_meta_count

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_top_sql_max_meta_count-new-in-v600)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)

### tidb_top_sql_max_time_series_count

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_top_sql_max_time_series_count-new-in-v600)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)

### tidb_track_aggregate_memory_usage

Referenced in:

- [System Variables](/system-variables.md#tidb_track_aggregate_memory_usage)

### tidb_tso_client_batch_max_wait_time

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_tso_client_batch_max_wait_time-new-in-v530)
- [TiDB Best Practices on Public Cloud](/best-practices/best-practices-on-public-cloud.md)
- [TiDB 5.3 Release Notes](/releases/release-5.3.0.md)

### tidb_tso_client_rpc_mode

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [System Variables](/system-variables.md#tidb_tso_client_rpc_mode-new-in-v840)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)

### tidb_ttl_delete_batch_size

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_ttl_delete_batch_size-new-in-v650)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_ttl_delete_rate_limit

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_ttl_delete_rate_limit-new-in-v650)
- [TiDB 8.5.1 Release Notes](/releases/release-8.5.1.md)
- [TiDB 7.5.6 Release Notes](/releases/release-7.5.6.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_ttl_delete_worker_count

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Periodically Delete Expired Data Using TTL (Time to Live)](/time-to-live.md)
- [System Variables](/system-variables.md#tidb_ttl_delete_worker_count-new-in-v650)
- [TiDB 8.4.0 Release Notes](/releases/release-8.4.0.md)
- [TiDB 8.1.2 Release Notes](/releases/release-8.1.2.md)
- [TiDB 7.1.6 Release Notes](/releases/release-7.1.6.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_ttl_job_enable

Referenced in:

- [Periodically Delete Expired Data Using TTL (Time to Live)](/time-to-live.md)
- [System Variables](/system-variables.md#tidb_ttl_job_enable-new-in-v650)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 8.1.2 Release Notes](/releases/release-8.1.2.md)
- [TiDB 7.5.5 Release Notes](/releases/release-7.5.5.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_ttl_job_schedule_window_end_time

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Periodically Delete Expired Data Using TTL (Time to Live)](/time-to-live.md)
- [System Variables](/system-variables.md#tidb_ttl_job_schedule_window_end_time-new-in-v650)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_ttl_job_schedule_window_start_time

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Periodically Delete Expired Data Using TTL (Time to Live)](/time-to-live.md)
- [System Variables](/system-variables.md#tidb_ttl_job_schedule_window_start_time-new-in-v650)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_ttl_running_tasks

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Periodically Delete Expired Data Using TTL (Time to Live)](/time-to-live.md)
- [System Variables](/system-variables.md#tidb_ttl_running_tasks-new-in-v700)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)

### tidb_ttl_scan_batch_size

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#tidb_ttl_scan_batch_size-new-in-v650)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_ttl_scan_worker_count

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Periodically Delete Expired Data Using TTL (Time to Live)](/time-to-live.md)
- [System Variables](/system-variables.md#tidb_ttl_scan_worker_count-new-in-v650)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### tidb_txn_assertion_level

Referenced in:

- [System Variables](/system-variables.md#tidb_txn_assertion_level-new-in-v600)
- [Troubleshoot Inconsistency Between Data and Indexes](/troubleshoot-data-inconsistency-errors.md)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)

### tidb_txn_commit_batch_size

Referenced in:

- [System Variables](/system-variables.md#tidb_txn_commit_batch_size-new-in-v620)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tidb_txn_entry_size_limit

Referenced in:

- [System Variables](/system-variables.md#tidb_txn_entry_size_limit-new-in-v760)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [Transaction Restraints](/develop/dev-guide-transaction-restraints.md)
- [Troubleshoot TiDB Lightning](/tidb-lightning/troubleshoot-tidb-lightning.md)
- [TiDB 8.5.2 Release Notes](/releases/release-8.5.2.md)
- [TiDB 7.6.0 Release Notes](/releases/release-7.6.0.md)

### tidb_txn_mode

Referenced in:

- [Configure TiDB for Optimal Performance](/tidb-performance-tuning-config.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Optimistic Transactions and Pessimistic Transactions](/develop/dev-guide-optimistic-and-pessimistic-transaction.md)
- [Replicate Data to MySQL-compatible Databases](/ticdc/ticdc-sink-to-mysql.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_txn_mode)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [TiDB Pessimistic Transaction Mode](/pessimistic-transaction.md)
- [Transactions](/transaction-overview.md)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)
- [TiDB 5.0 Release Notes](/releases/release-5.0.0.md)
- [TiDB 3.0.8 Release Notes](/releases/release-3.0.8.md)
- [TiDB 3.0.4 Release Notes](/releases/release-3.0.4.md)

### tidb_use_plan_baselines

Referenced in:

- [CREATE [GLOBAL|SESSION] BINDING](/sql-statements/sql-statement-create-binding.md)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL Plan Management (SPM)](/sql-plan-management.md)
- [System Variables](/system-variables.md#tidb_use_plan_baselines-new-in-v40)

### tidb_wait_split_region_finish

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [Split Region](/sql-statements/sql-statement-split-region.md)
- [System Variables](/system-variables.md#tidb_wait_split_region_finish)

### tidb_wait_split_region_timeout

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [Split Region](/sql-statements/sql-statement-split-region.md)
- [System Variables](/system-variables.md#tidb_wait_split_region_timeout)

### tidb_window_concurrency

Referenced in:

- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [System Variables](/system-variables.md#tidb_window_concurrency-new-in-v40)

### tiflash_fastscan

Referenced in:

- [System Variables](/system-variables.md#tiflash_fastscan-new-in-v630)
- [Use FastScan](/tiflash/use-fastscan.md)
- [TiDB 7.0.0 Release Notes](/releases/release-7.0.0.md)
- [TiDB 6.3.0 Release Notes](/releases/release-6.3.0.md)

### tiflash_fine_grained_shuffle_batch_size

Referenced in:

- [System Variables](/system-variables.md#tiflash_fine_grained_shuffle_batch_size-new-in-v620)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tiflash_fine_grained_shuffle_stream_count

Referenced in:

- [System Variables](/system-variables.md#tiflash_fine_grained_shuffle_stream_count-new-in-v620)
- [Tune TiFlash Performance](/tiflash/tune-tiflash-performance.md)
- [TiDB 6.2.0 Release Notes](/releases/release-6.2.0.md)

### tiflash_hashagg_preaggregation_mode

Referenced in:

- [System Variables](/system-variables.md#tiflash_hashagg_preaggregation_mode-new-in-v830)
- [TiDB 8.3.0 Release Notes](/releases/release-8.3.0.md)

### tiflash_mem_quota_query_per_node

Referenced in:

- [System Variables](/system-variables.md#tiflash_mem_quota_query_per_node-new-in-v740)
- [TiFlash Spill to Disk](/tiflash/tiflash-spill-disk.md)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)

### tiflash_query_spill_ratio

Referenced in:

- [System Variables](/system-variables.md#tiflash_query_spill_ratio-new-in-v740)
- [TiFlash Spill to Disk](/tiflash/tiflash-spill-disk.md)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)

### tiflash_replica_read

Referenced in:

- [Create TiFlash Replicas](/tiflash/create-tiflash-replicas.md)
- [System Variables](/system-variables.md#tiflash_replica_read-new-in-v730)
- [TiDB Features](/basic-features.md)
- [TiDB 7.3.0 Release Notes](/releases/release-7.3.0.md)

### tikv_client_read_timeout

Referenced in:

- [System Variables](/system-variables.md#tikv_client_read_timeout-new-in-v740)
- [TiDB Cloud Performance Highlights for TiDB v8.5.0](https://docs.pingcap.com/tidbcloud/v8.5-performance-highlights)
- [TiDB 7.5.1 Release Notes](/releases/release-7.5.1.md)
- [TiDB 7.4.0 Release Notes](/releases/release-7.4.0.md)

### time_zone

Referenced in:

- [Date and Time Types](/data-type-date-and-time.md)
- [Migrate from TiDB Self-Managed to TiDB Cloud](https://docs.pingcap.com/tidbcloud/migrate-from-op-tidb)
- [SHOW [GLOBAL|SESSION] VARIABLES](/sql-statements/sql-statement-show-variables.md)
- [SQL Prepared Execution Plan Cache](/sql-prepared-plan-cache.md)
- [System Variables](/system-variables.md#time_zone)
- [Time Zone Support](/configure-time-zone.md)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)
- [TiDB 2.1.8 Release Notes](/releases/release-2.1.8.md)

### timestamp

Referenced in:

- [System Variables](/system-variables.md#timestamp)

### transaction_isolation

Referenced in:

- [Known Incompatibility Issues with Third-Party Tools](/develop/dev-guide-third-party-tools-compatibility.md)
- [SET TRANSACTION](/sql-statements/sql-statement-set-transaction.md)
- [System Variables](/system-variables.md#transaction_isolation)
- [TiDB Transaction Isolation Levels](/transaction-isolation-levels.md)
- [TiDB 6.0.0 Release Notes](/releases/release-6.0.0-dmr.md)

### tx_isolation

Referenced in:

- [Performance Tuning Practices for OLTP Scenarios](/performance-tuning-practices.md)
- [System Variables](/system-variables.md#tx_isolation)

### tx_isolation_one_shot

Referenced in:

- [System Variables](/system-variables.md#tx_isolation_one_shot)

### tx_read_ts

Referenced in:

- [System Variables](/system-variables.md#tx_read_ts)

### txn_scope

Referenced in:

- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#txn_scope)
- [TiDB Configuration File](/tidb-configuration-file.md)
- [Use Resource Control to Achieve Resource Group Limitation and Flow Control](/tidb-resource-control-ru-groups.md)

### validate_password.check_user_name

Referenced in:

- [Encryption and Compression Functions](/functions-and-operators/encryption-and-compression-functions.md)
- [System Variables](/system-variables.md#validate_passwordcheck_user_name-new-in-v650)
- [TiDB Password Management](/password-management.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### validate_password.dictionary

Referenced in:

- [Encryption and Compression Functions](/functions-and-operators/encryption-and-compression-functions.md)
- [Security Compatibility with MySQL](/security-compatibility-with-mysql.md)
- [System Variables](/system-variables.md#validate_passworddictionary-new-in-v650)
- [TiDB Password Management](/password-management.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### validate_password.enable

Referenced in:

- [Encryption and Compression Functions](/functions-and-operators/encryption-and-compression-functions.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [Security Compatibility with MySQL](/security-compatibility-with-mysql.md)
- [System Variables](/system-variables.md#validate_passwordenable-new-in-v650)
- [TiDB Password Management](/password-management.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### validate_password.length

Referenced in:

- [Encryption and Compression Functions](/functions-and-operators/encryption-and-compression-functions.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#validate_passwordlength-new-in-v650)
- [TiDB Password Management](/password-management.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### validate_password.mixed_case_count

Referenced in:

- [Encryption and Compression Functions](/functions-and-operators/encryption-and-compression-functions.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#validate_passwordmixed_case_count-new-in-v650)
- [TiDB Password Management](/password-management.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### validate_password.number_count

Referenced in:

- [Encryption and Compression Functions](/functions-and-operators/encryption-and-compression-functions.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#validate_passwordnumber_count-new-in-v650)
- [TiDB Password Management](/password-management.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### validate_password.policy

Referenced in:

- [Encryption and Compression Functions](/functions-and-operators/encryption-and-compression-functions.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#validate_passwordpolicy-new-in-v650)
- [TiDB Password Management](/password-management.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### validate_password.special_char_count

Referenced in:

- [Encryption and Compression Functions](/functions-and-operators/encryption-and-compression-functions.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#validate_passwordspecial_char_count-new-in-v650)
- [TiDB Password Management](/password-management.md)
- [TiDB 6.5.0 Release Notes](/releases/release-6.5.0.md)

### version

Referenced in:

- [System Variables](/system-variables.md#version)

### version_comment

Referenced in:

- [System Variables](/system-variables.md#version_comment)

### version_compile_machine

Referenced in:

- [System Variables](/system-variables.md#version_compile_machine)

### version_compile_os

Referenced in:

- [System Variables](/system-variables.md#version_compile_os)

### wait_timeout

Referenced in:

- [Best Practices for Developing Java Applications with TiDB](/develop/java-app-best-practices.md)
- [Connection Pools and Connection Parameters](/develop/dev-guide-connection-parameters.md)
- [Limited SQL features on TiDB Cloud](https://docs.pingcap.com/tidbcloud/limited-sql-features)
- [System Variables](/system-variables.md#wait_timeout)
- [TiDB Cluster Management FAQs](/faq/manage-cluster-faq.md)
- [TiProxy Overview](/tiproxy/tiproxy-overview.md)
- [Timeouts in TiDB](/develop/dev-guide-timeouts-in-tidb.md)
- [Troubleshoot TiDB OOM Issues](/troubleshoot-tidb-oom.md)
- [TiDB 3.0 Beta Release Notes](/releases/release-3.0-beta.md)
- [TiDB 3.0 GA Release Notes](/releases/release-3.0-ga.md)

### warning_count

Referenced in:

- [System Variables](/system-variables.md#warning_count)
- [TiDB 2.1 RC1 Release Notes](/releases/release-2.1-rc.1.md)

### windowing_use_high_precision

Referenced in:

- [System Variables](/system-variables.md#windowing_use_high_precision)
- [Window Functions](/functions-and-operators/window-functions.md)