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https://dev.mysql.com/doc/refman/9.7/en/controlling-query-plan-evaluation.html
The task of the query optimizer is to find an optimal plan for executing an SQL query. Because the difference in performance between “good” and “bad” plans can be orders of magnitude (that is, seconds versus hours or even days), most query ...
https://dev.mysql.com/doc/refman/9.7/en/alter-event.html
The syntax for each of the DEFINER, ON SCHEDULE, ON COMPLETION, COMMENT, ENABLE / DISABLE, and DO clauses is exactly the same as when used with CREATE EVENT. (See Section 15.1.15, “CREATE EVENT Statement”.) Any user can alter an event defined on ...
https://dev.mysql.com/doc/refman/9.7/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. Group attributes enable control over ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-temporary-account-locks-table.html
The temporary_account_locks table lists the users with temporarily locked accounts. The temporary_account_locks table has these columns: USER The user name of the account used. FAILED_LOGIN_ATTEMPTS The number of login attempts, as defined in the ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-functions.html
MySQL includes built-in SQL functions that format or retrieve Performance Schema data, and that may be used as equivalents for the corresponding sys schema stored functions. The built-in functions can be invoked in any schema and require no ...
https://dev.mysql.com/doc/refman/9.7/en/charset.html
MySQL includes character set support that enables you to store data using a variety of character sets and perform comparisons according to a variety of collations. The default MySQL server character set and collation are utf8mb4 and ...
https://dev.mysql.com/doc/refman/9.7/en/partitioning-limitations-functions.html
This section discusses limitations in MySQL Partitioning relating specifically to functions used in partitioning expressions. Each of these functions returns an integer only if it is passed an argument of an exact numeric type, such as one of the ...
https://dev.mysql.com/doc/refman/9.7/en/mysqldump.html
The mysqldump client utility performs logical backups, producing a set of SQL statements that can be executed to reproduce the original database object definitions and table data. It dumps one or more MySQL databases for backup or transfer to ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-commands.html
mysql sends each SQL statement that you issue to the server to be executed. There is also a set of commands that mysql itself interprets. For a list of these commands, type help or \h at the mysql> prompt: mysql> help List of all MySQL commands: ...
https://dev.mysql.com/doc/refman/9.7/en/backup-policy.html
A full backup (a snapshot of the data at a point in time) can be done in MySQL with several tools. For example, MySQL Enterprise Backup can perform a physical backup of an entire instance, with optimizations to minimize overhead and avoid disruption ...