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https://dev.mysql.com/doc/refman/8.0/en/keyring-system-variables.html
(It is permissible to rename or move the file, as long as you change the value of keyring_file_data to match.) It is recommended that you create a separate backup of the keyring data file immediately after you create the first encrypted table and ...
https://dev.mysql.com/doc/refman/8.0/en/index-hints.html
They also work with multi-table DELETE statements, but not with single-table DELETE, as shown later in this section. (For the general syntax for specifying tables in a SELECT statement, see Section 15.2.13.2, “JOIN Clause”.) The syntax for ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-internal-data.html
Note This section describes locking information as exposed by the Performance Schema data_locks and data_lock_waits tables, which supersede the INFORMATION_SCHEMA INNODB_LOCKS and INNODB_LOCK_WAITS tables in MySQL 8.0. For similar discussion ...
https://dev.mysql.com/doc/refman/8.0/en/load-index.html
| ALL } The LOAD INDEX INTO CACHE statement preloads a table index into the key cache to which it has been assigned by an explicit CACHE INDEX statement, or into the default key cache otherwise. LOAD INDEX INTO CACHE applies only to MyISAM tables, ...tbl_index_list: tbl_name [PARTITION (partition_list)] [{INDEX|KEY} (index_name[, index_name] ...)] [IGNORE LEAVES] partition_list: { partition_name[, partition_name] ...
https://dev.mysql.com/doc/refman/8.0/en/optimize-overview.html
Database performance depends on several factors at the database level, such as tables, queries, and configuration settings. In practice, the advanced InnoDB performance features mean that InnoDB tables often outperform the simpler MyISAM tables, ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-obtaining-parent-events.html
Rows of this table have a THREAD_ID column indicating the thread ID of the session that owns the lock, and an EVENT_ID column indicating the Performance Schema event that caused the lock. To find lock information, data_locks is the table containing ...The relation is based on a nested set data model, so the join has several ...
https://dev.mysql.com/doc/refman/8.0/en/engine-condition-pushdown-optimization.html
An example of such a query, using the table t1 created previously, is shown here: mysql> EXPLAIN -> SELECT * FROM t1 AS x -> LEFT JOIN t1 AS y -> ON x.a=0 AND y.b>=3\G *************************** 1. Joins are not directly supported; conditions ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndb-api-statistics.html
This reflects the creation of the hidden primary key that is a feature of all tables using the NDB storage engine. Such actions include starting and closing (or aborting) transactions; primary key and unique key operations; table, range, and pruned ... A number of types of statistical counters relating to actions performed by or affecting Ndb objects are ...
https://dev.mysql.com/doc/refman/8.0/en/events-privileges.html
This user then creates the following event: CREATE EVENT e_insert ON SCHEDULE EVERY 7 SECOND DO INSERT INTO myschema.mytable; After this event has been created, root revokes the EVENT privilege for jon@ghidora. The EVENT privilege governs the ... To ...
https://dev.mysql.com/doc/refman/8.0/en/forcing-innodb-recovery.html
With an innodb_force_recovery value of 3 or less you can DROP or CREATE tables. To investigate database page corruption, you might dump your tables from the database with SELECT ... In such cases, you can use the innodb_force_recovery option to ...