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https://dev.mysql.com/doc/refman/8.0/en/parenthesized-query-expressions.html
parenthesized_query_expression: ( query_expression [order_by_clause] [limit_clause] ) [order_by_clause] [limit_clause] [into_clause] query_expression: query_block [set_op query_block [set_op query_block ...]] [order_by_clause] [limit_clause] ...
https://dev.mysql.com/doc/refman/8.0/en/controlling-query-plan-evaluation.html
For join queries, the number of possible plans investigated by the MySQL optimizer grows exponentially with the number of tables referenced in a query. However, when larger queries are submitted, the time spent in query optimization may easily ...
https://dev.mysql.com/doc/refman/8.0/en/rewriter-query-rewrite-plugin-reference.html
Rewriter_number_rewritten_queries The number of queries rewritten by the Rewriter query rewrite plugin since it was loaded. Users communicate with the plugin by modifying the set of rules stored in this table. The plugin communicates information to ...
https://dev.mysql.com/doc/refman/8.0/en/fulltext-query-expansion.html
Full-text search supports query expansion (and in particular, its variant “blind query expansion”). This is generally useful when a search phrase is too short, which often means that the user is relying on implied knowledge that the full-text ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-queries.html
To tune queries for InnoDB tables, create an appropriate set of indexes on each table. Follow these guidelines for InnoDB indexes: Because each InnoDB table has a primary key (whether you request one or not), specify a set of primary key columns ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-multiple-get-range-query.html
The daemon_memcached plugin supports multiple get operations (fetching multiple key-value pairs in a single memcached query) and range queries. Range Queries For range queries, the daemon_memcached plugin supports the following comparison ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-query-profiling.html
The following example demonstrates how to use Performance Schema statement events and stage events to retrieve data comparable to profiling information provided by SHOW PROFILES and SHOW PROFILE statements. The setup_actors table can be used to ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-gr-memory-monitoring-ps-sample-queries.html
This section describes sample queries using the instruments and events for monitoring Group Replication memory usage. The memory data can be queried for individual events, for example: SELECT * FROM ...row *************************** EVENT_NAME: ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-queries-myisam.html
Some general tips for speeding up queries on MyISAM tables: To help MySQL better optimize queries, use ANALYZE TABLE or run myisamchk --analyze on a table after it has been loaded with data. This is a good way to make queries faster if you have a ...This updates a value for each index part that indicates the average number of rows that have the same ...
https://dev.mysql.com/doc/refman/8.0/en/rewriter-query-rewrite-plugin-usage.html
To enable or disable the plugin, enable or disable the rewriter_enabled system variable. By default, the Rewriter plugin is enabled when you install it (see Section 7.6.4.1, “Installing or Uninstalling the Rewriter Query Rewrite Plugin”). To ...