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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/temporary-files.html
For some statements, MySQL creates temporary SQL tables that are not hidden and have names that begin with #sql. Some SELECT queries creates temporary SQL tables to hold intermediate results. DDL operations that rebuild the table and are not ...The ... On Unix, MySQL uses the value of the TMPDIR environment variable as the path name of the directory in which to store temporary ...
https://dev.mysql.com/doc/refman/8.0/en/alter-user.html
The latter corresponds to the type of value displayed by SHOW CREATE USER for password hashes containing unprintable characters when the print_identified_with_as_hex system variable is enabled. In most cases, ALTER USER requires the global CREATE ...
https://dev.mysql.com/doc/refman/8.0/en/cache-index.html
A key cache must exist before you assign indexes to it, or an error occurs: mysql> CACHE INDEX t1 IN non_existent_cache; ERROR 1284 (HY000): Unknown key cache 'non_existent_cache' By default, table indexes are assigned to the main (default) key ...| ...| tbl_name PARTITION (partition_list) } IN key_cache_name tbl_index_list: tbl_name [{INDEX|KEY} (index_name[, index_name] ...)] partition_list: { partition_name[, partition_name] ...
https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-sets.html
Miscellaneous Information The xxx_general_mysql500_ci collations preserve the pre-5.1.24 ordering of the original xxx_general_ci collations and permit upgrades for tables created before MySQL 5.1.24 (Bug #27877). Beginning with MySQL 8.0.28, utf8mb3 ... This section describes the collations available for Unicode character sets and their differentiating ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-start.html
myisam_max_sort_file_size The maximum size of the temporary file that MySQL is permitted to use while re-creating a MyISAM index (during REPAIR TABLE, ALTER TABLE, or LOAD DATA). If the server finds an error, it tries to do a fast table repair (with ... The following options to mysqld can be used to change the behavior of MyISAM ...