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https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-locks-per-fragment.html
The locks_per_fragment table provides information about counts of lock claim requests, and the outcomes of these requests on a per-fragment basis, serving as a companion table to operations_per_fragment and memory_per_fragment. This table also ...
https://dev.mysql.com/doc/refman/8.0/en/se-csv-repair.html
The CSV storage engine supports the CHECK TABLE and REPAIR TABLE statements to verify and, if possible, repair a damaged CSV table. When running the CHECK TABLE statement, the CSV file is checked for validity by looking for the correct field ...
https://dev.mysql.com/doc/refman/8.0/en/known-issues.html
If you use ALTER TABLE to add a UNIQUE index to a table used in a MERGE table and then add a normal index on the MERGE table, the key order is different for the tables if there was an old, non-UNIQUE key in the table. This is because ALTER TABLE ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-upgrade-downgrade.html
Do not use ALTER TABLE on any existing NDB tables; do not create any new NDB tables which cannot be safely dropped prior to downgrading. After backing up the state data, drop all NDB tables which have been created or altered since the upgrade took ...In many cases, mysqld cannot open tables that were created or modified by a later version of ... Versions Supported for Upgrade to NDB 8.0 Reverting an NDB Cluster 8.0 Upgrade Known Issues When Upgrading or Downgrading NDB Cluster This section provides information about NDB Cluster software and ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-events-table.html
The EVENTS table provides information about Event Manager events, which are discussed in Section 27.4, “Using the Event Scheduler”. The EVENTS table has these columns: EVENT_CATALOG The name of the catalog to which the event belongs. EXECUTE_AT ...EVENT_SCHEMA The name of the schema (database) to which the event ...
https://dev.mysql.com/doc/refman/8.0/en/nested-join-optimization.html
The syntax of table_factor is extended in comparison with the SQL Standard. The latter accepts only table_reference, not a list of them inside a pair of parentheses. This is a conservative extension if we consider each comma in a list of ...The ...
https://dev.mysql.com/doc/refman/8.0/en/plugin-loading.html
Alternatively, the INSTALL PLUGIN statement causes the server to load the plugin code from the library file at runtime: INSTALL PLUGIN myplugin SONAME 'somepluglib.so'; INSTALL PLUGIN also causes “permanent” plugin registration: The plugin is ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-file-defragmenting.html
To speed up index scans, you can periodically perform a “null” ALTER TABLE operation, which causes MySQL to rebuild the table: ALTER TABLE tbl_name ENGINE=INNODB You can also use ALTER TABLE tbl_name FORCE to perform a “null” alter operation ...One symptom of fragmentation is that a table takes more space than it “should” ... Random ...
https://dev.mysql.com/doc/refman/8.0/en/cannot-find-table.html
Even for file systems that are not case-sensitive, such as on Windows, all references to a given table within a query must use the same lettercase. You can check which tables are in the default database with SHOW TABLES.
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-foreign-cols-table.html
The INNODB_FOREIGN_COLS table provides status information about InnoDB foreign key columns. For related usage information and examples, see Section 17.15.3, “InnoDB INFORMATION_SCHEMA Schema Object Tables”. The INNODB_FOREIGN_COLS table has ...