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https://dev.mysql.com/doc/refman/8.0/en/select-benchmarking.html
To measure the speed of a specific MySQL expression or function, invoke the BENCHMARK() function using the mysql client program. The return value is always zero, but mysql prints a line displaying approximately how long the statement took to ...
https://dev.mysql.com/doc/refman/8.0/en/show-create-user.html
The statement requires the SELECT privilege for the mysql system schema, except to see information for the current user. For the current user, the SELECT privilege for the mysql.user system table is required for display of the password hash in the ... SHOW CREATE USER user This statement shows the CREATE USER statement that creates the named ...
https://dev.mysql.com/doc/refman/8.0/en/show-procedure-code.html
SHOW PROCEDURE CODE proc_name This statement is a MySQL extension that is available only for servers that have been built with debugging support. It displays a representation of the internal implementation of the named stored procedure. A similar ...
https://dev.mysql.com/doc/refman/8.0/en/sys-create-synonym-db.html
Given a schema name, this procedure creates a synonym schema containing views that refer to all the tables and views in the original schema. This can be used, for example, to create a shorter name by which to refer to a schema with a long name ...
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-elements.html
Prior to MySQL 8.0.14, the monitoring tables are INFORMATION_SCHEMA tables; see Section 28.5, “INFORMATION_SCHEMA Thread Pool Tables”. The INFORMATION_SCHEMA tables now are deprecated; expect them to be removed in a future version of MySQL. For ...Applications should transition away from the INFORMATION_SCHEMA tables to the Performance Schema ...
https://dev.mysql.com/doc/refman/8.0/en/x-plugin-checking-installation.html
X Plugin is enabled by default in MySQL 8, therefore installing or upgrading to MySQL 8 makes the plugin available. You can verify X Plugin is installed on an instance of MySQL server by using the SHOW plugins statement to view the plugins list. | ...
https://dev.mysql.com/doc/refman/8.0/en/xa-restrictions.html
For “external XA,” a MySQL server acts as a Resource Manager and client programs act as Transaction Managers. For “Internal XA”, storage engines within a MySQL server act as RMs, and the server itself acts as a TM. The requirement that the ... XA transaction support is limited to the InnoDB storage ...
https://dev.mysql.com/doc/refman/8.0/en/create-trigger.html
The DEFINER clause specifies the MySQL account to be used when checking access privileges at trigger activation time. MySQL takes the DEFINER user into account when checking trigger privileges as follows: At CREATE TRIGGER time, the user who issues ... CREATE [DEFINER = user] TRIGGER [IF NOT EXISTS] trigger_name trigger_time trigger_event ON tbl_name FOR EACH ROW [trigger_order] trigger_body trigger_time: { BEFORE | AFTER } trigger_event: { INSERT | UPDATE | DELETE } trigger_order: { FOLLOWS | PRECEDES } other_trigger_name This statement creates a new ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-tables-table.html
The information_schema_stats_expiry system variable defines the period of time before cached table statistics expire. To update cached values at any time for a given table, use ANALYZE TABLE. With the removal of .frm files in MySQL 8.0, this column ...If there are no cached statistics or statistics have expired, statistics are retrieved from storage engines when querying table statistics ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-events-table.html
TIME_ZONE The event time zone, which is the time zone used for scheduling the event and that is in effect within the event as it executes. EVENT_TYPE The event repetition type, either ONE TIME (transient) or RECURRING (repeating). EXECUTE_AT For a ... The EVENTS table provides information about Event Manager events, which are discussed in Section 27.4, “Using the Event ...