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https://dev.mysql.com/doc/refman/5.7/en/sys-sys-config-insert-set-user.html
For rows added to the sys_config table by INSERT statements, the sys_config_insert_set_user trigger sets the set_by column to the current user.
https://dev.mysql.com/doc/refman/5.7/en/sys-sys-get-config.html
Given a configuration option name, returns the option value from the sys_config table, or the provided default value (which may be NULL) if the option does not exist in the table. If sys_get_config() returns the default value and that value is ...
https://dev.mysql.com/doc/refman/5.7/en/table-corruption.html
If you have started mysqld with the myisam_recover_options system variable set, MySQL automatically checks and tries to repair MyISAM tables if they are marked as 'not closed properly' or 'crashed'. If this happens, MySQL writes an entry in the ...
https://dev.mysql.com/doc/refman/5.7/en/table-scan-avoidance.html
The output from EXPLAIN shows ALL in the type column when MySQL uses a full table scan to resolve a query. This usually happens under the following conditions: The table is so small that it is faster to perform a table scan than to bother with a ...
https://dev.mysql.com/doc/refman/5.7/en/temporary-table-problems.html
Temporary tables created with CREATE TEMPORARY TABLE have the following limitations: TEMPORARY tables are supported only by the InnoDB, MEMORY, MyISAM, and MERGE storage engines. Use ALTER TABLE instead: ALTER TABLE old_name RENAME new_name; You ...
https://dev.mysql.com/doc/refman/5.7/en/thread-information.html
To ascertain what your MySQL server is doing, it can be helpful to examine the process list, which indicates the operations currently being performed by the set of threads executing within the server. row *************************** Id: 1 User: ...
https://dev.mysql.com/doc/refman/5.7/en/thread-pool-elements.html
MySQL Enterprise Thread Pool comprises these elements: A plugin library file implements a plugin for the thread pool code as well as several associated monitoring tables that provide information about thread pool operation. For a detailed ...
https://dev.mysql.com/doc/refman/5.7/en/thread-pool.html
Note MySQL Enterprise Thread Pool is an extension included in MySQL Enterprise Edition, a commercial product. MySQL Enterprise Edition includes MySQL Enterprise Thread Pool, implemented using a server plugin. The default thread-handling model in ...
https://dev.mysql.com/doc/refman/5.7/en/time.html
MySQL retrieves and displays TIME values in 'hh:mm:ss' format (or 'hhh:mm:ss' format for large hours values). The hours part may be so large because the TIME type can be used not only to represent a time of day (which must be less than 24 hours), ...
https://dev.mysql.com/doc/refman/5.7/en/timestamp-lookups.html
Temporal values are stored in TIMESTAMP columns as UTC values, and values inserted into and retrieved from TIMESTAMP columns are converted between the session time zone and UTC. (This is the same type of conversion performed by the CONVERT_TZ() ...