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https://dev.mysql.com/doc/refman/8.0/en/audit-log-installation.html
Create the database first; its name should not exceed 64 characters. For example: mysql> CREATE DATABASE IF NOT EXISTS database-name; Next, run the script using the alternative database name. $> mysql -u root -p -D database-name < ... This section ...
https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-conversion.html
Tables created with these row formats enable you to index a maximum of 1024 or 768 characters for utf8mb3 or utf8mb4 columns, respectively. In terms of table content, conversion from utf8mb3 to utf8mb4 presents no problems: For a BMP character, ...
https://dev.mysql.com/doc/refman/8.0/en/resource-groups.html
MySQL supports creation and management of resource groups, and permits assigning threads running within the server to particular groups so that threads execute according to the resources available to the group. For example, to manage execution of ...Group attributes enable control over its resources, to enable or restrict resource consumption by threads in the ...
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/innodb-troubleshooting-datadict.html
See Section 17.6.1.4, “Moving or Copying InnoDB Tables” for information about creating clean backups. On the new MySQL instance, recreate the table in a database of the same name. Information about table definitions is stored in the InnoDB data ...If you move data files around, dictionary data can become ...
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 ...