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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-data-lock-waits-table.html
The data_lock_waits table implements a many-to-many relationship showing which data lock requests in the data_locks table are blocked by which held data locks in the data_locks table. The table exposes not only which lock a session or transaction ...Held locks in data_locks appear in data_lock_waits only if they block some lock ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-table-constraints-extensions-table.html
The TABLE_CONSTRAINTS_EXTENSIONS table (available as of MySQL 8.0.21) provides information about table constraint attributes defined for primary and secondary storage engines. The TABLE_CONSTRAINTS_EXTENSIONS table has these columns: ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-view-table-usage-table.html
The VIEW_TABLE_USAGE table (available as of MySQL 8.0.13) provides access to information about tables and views used in view definitions. You can see information only for views for which you have some privilege, and only for tables for which you ...
https://dev.mysql.com/doc/refman/8.0/en/column-count-limit.html
Functional key parts (see Section 15.1.15, “CREATE INDEX Statement”) are implemented as hidden virtual generated stored columns, so each functional key part in a table index counts against the table total column limit. mysql> CREATE TABLE t (a ... This section describes limits on the number of columns in tables and the size of individual ...The storage ...
https://dev.mysql.com/doc/refman/8.0/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/8.0/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/8.0/en/join.html
MySQL supports the following JOIN syntax for the table_references part of SELECT statements and multiple-table DELETE and UPDATE statements: table_references: escaped_table_reference [, escaped_table_reference] ... A table reference (when it refers ...index_hint: { USE {INDEX|KEY} [FOR {JOIN|ORDER BY|GROUP BY}] ([index_list]) | {IGNORE|FORCE} {INDEX|KEY} [FOR {JOIN|ORDER BY|GROUP BY}] (index_list) } index_list: index_name [, index_name] ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-setup-instruments-table.html
When an instrument is enabled and executed, instrumented instances are created, which are visible in the xxx_instances tables, such as file_instances or rwlock_instances. The setup_instruments table lists classes of instrumented objects for which ...row *************************** NAME: stage/sql/executing ENABLED: NO TIMED: NO PROPERTIES: FLAGS: NULL VOLATILITY: 0 DOCUMENTATION: NULL ...
https://dev.mysql.com/doc/refman/8.0/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 ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-table-reference.html
The following table summarizes INFORMATION_SCHEMA InnoDB tables. For greater detail, see the individual table descriptions. Table 28.3 INFORMATION_SCHEMA InnoDB Tables Table Name Description Introduced INNODB_BUFFER_PAGE Pages in InnoDB buffer pool ...