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https://dev.mysql.com/doc/refman/8.0/en/optimize-multi-tables.html
Some techniques for keeping individual queries fast involve splitting data across many tables. When the number of tables runs into the thousands or even millions, the overhead of dealing with all these tables becomes a new performance consideration.
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-innodb-redo-log-files-table.html
The innodb_redo_log_files table contains a row for each active InnoDB redo log file. The innodb_redo_log_files table has the following columns: FILE_ID The ID of the redo log file. FILE_NAME The path and file name of the redo log file. START_LSN ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-instance-tables.html
They provide event names and explanatory notes or status information: cond_instances: Condition synchronization object instances file_instances: File instances mutex_instances: Mutex synchronization object instances rwlock_instances: Lock ...There ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-lock-tables.html
The Performance Schema exposes lock information through these tables: data_locks: Data locks held and requested data_lock_waits: Relationships between data lock owners and data lock requestors blocked by those owners metadata_locks: Metadata locks ...
https://dev.mysql.com/doc/refman/8.0/en/derived-condition-pushdown-optimization.html
For a query in which the condition is on the tables of a view created using ALGORITHM=TEMPTABLE instead of on the view itself, the multiple equality is not recognized at resolution, and thus the condition cannot be not pushed down. When a derived ...
https://dev.mysql.com/doc/refman/8.0/en/data-dictionary-schema.html
If an upgrade is necessary and supported, the server creates data dictionary tables with updated definitions, copies persisted metadata to the new tables, atomically replaces the old tables with the new ones, and reinitializes the data dictionary.
https://dev.mysql.com/doc/refman/8.0/en/ansi-diff-select-into-table.html
For example: INSERT INTO tbl_temp2 (fld_id) SELECT tbl_temp1.fld_order_id FROM tbl_temp1 WHERE tbl_temp1.fld_order_id > 100; Alternatively, you can use SELECT ... The same syntax can also be used inside stored routines using cursors and local ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-connection-attribute-tables.html
These Performance Schema tables expose attribute information: session_account_connect_attrs: Connection attributes for the current session, and other sessions associated with the session account session_connect_attrs: Connection attributes for all ... Connection attributes are key-value pairs that application programs can pass to the server at connect ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-miscellaneous-tables.html
The following sections describe tables that do not fall into the table categories discussed in the preceding sections: component_scheduler_tasks: The current status of each scheduled task. user_defined_functions: Loadable functions registered by a ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-drop-index.html
Usage ndb_drop_index -c connection_string table_name index -d db_name The statement shown above drops the index named index from the table in the database. Options that can be used with ndb_drop_index are shown in the following table. --database, -d ...It is recommended that you use this utility only as an example for writing NDB API applications—see the Warning later in this section for ...