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https://dev.mysql.com/doc/refman/8.4/en/symbolic-links-to-tables.html
For files used by tables for other storage engines, you may get strange problems if you try to use symbolic links. For InnoDB tables, use the alternative technique explained in Section 17.6.1.2, “Creating Tables Externally” instead. Do not ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-data-locks-table.html
For information about which lock requests are blocked by which held locks, see Section 29.12.13.2, “The data_lock_waits Table”. row *************************** ENGINE: INNODB ENGINE_LOCK_ID: 139664434886512:1059:139664350547912 ...Example data ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-information-schema-buffer-pool-tables.html
The InnoDB INFORMATION_SCHEMA buffer pool tables provide buffer pool status information and metadata about the pages within the InnoDB buffer pool. The InnoDB INFORMATION_SCHEMA buffer pool tables include those listed below: mysql> SHOW TABLES FROM ...INNODB_BUFFER_PAGE_LRU: Holds information about the pages in the InnoDB buffer pool, in particular how they are ordered in the LRU list that determines which pages to evict from the buffer pool when it becomes ...
https://dev.mysql.com/doc/refman/8.4/en/myisam-table-maintenance.html
This section discusses how to use myisamchk to check or repair MyISAM tables (tables that have .MYD and .MYI files for storing data and indexes). For general myisamchk background, see Section 6.6.4, “myisamchk — MyISAM Table-Maintenance ...
https://dev.mysql.com/doc/refman/8.4/en/show-open-tables.html
SHOW OPEN TABLES [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW OPEN TABLES lists the non-TEMPORARY tables that are currently open in the table cache. The FROM clause, if present, restricts the tables shown to those present in the db_name ...The WHERE clause can be given to select rows using more general conditions, as discussed in Section 28.8, “Extensions to SHOW ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-processlist-table.html
For a comparison of this table with other sources, see Sources of Process Information. Note If the performance_schema_show_processlist system variable is enabled, the processlist table also serves as the basis for an alternative implementation ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-memory-summary-tables.html
Memory summary tables do not contain timing information because memory events are not timed. Example memory event summary information: mysql> SELECT * FROM performance_schema.memory_summary_global_by_event_name WHERE EVENT_NAME = ...Operation counts ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-stage-summary-tables.html
The Performance Schema maintains tables for collecting current and recent stage events, and aggregates that information in summary tables. Section 29.12.5, “Performance Schema Stage Event Tables” describes the events on which stage summaries ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-transaction-summary-tables.html
The Performance Schema maintains tables for collecting current and recent transaction events, and aggregates that information in summary tables. Section 29.12.7, “Performance Schema Transaction Tables” describes the events on which transaction ...Example transaction event summary information: mysql> SELECT * FROM performance_schema.events_transactions_summary_global_by_event_name LIMIT 1\G *************************** ...
https://dev.mysql.com/doc/refman/8.4/en/information-schema-innodb-cmp-per-index-table.html
The INNODB_CMP_PER_INDEX and INNODB_CMP_PER_INDEX_RESET tables provide status information on operations related to compressed InnoDB tables and indexes, with separate statistics for each combination of database, table, and index, to help you ...