The SHOW EVENTS statement in MySQL displays information about events managed by the Event Scheduler, a component that allows for scheduling recurring or one-time tasks to be executed automatically on the server. This statement is useful for examining the current status of events, identifying their scheduling information, and verifying their execution history.
Syntax
Here’s a brief explanation of how to use the SHOW EVENTS statement:
SHOW EVENTS [FROM db_name] [LIKE 'pattern' | WHERE expr]
Parameters:
FROM db_name: Specifies the database from which to show the events. If omitted, it shows events from the current database.
LIKE ‘pattern’: Allows you to filter the events based on a pattern.
WHERE expr: Enables you to use a condition to filter the events.
Example
SHOW EVENTS FROM mydatabase;
This query would display information about all the events scheduled in the “mydatabase” database.
Output Columns:
Db: The name of the database containing the event.
Name: The name of the event.
Definer: The account that defined the event.
Time zone: The time zone in which the event is defined.
Type: The type of event (e.g., ONE TIME, RECURRING).
Execute at: The timestamp when the event is scheduled to execute.
Interval value: The interval value for recurring events.
Interval Field: The unit of time for the interval value (e.g., DAY, HOUR, MINUTE).
Starts: The timestamp indicating when the event is scheduled to start executing.
Ends: The timestamp indicating when the event is scheduled to stop executing.
Status: The current status of the event (ENABLED, DISABLED, or SLAVESIDE_ENABLED).
Originator: The ID of the account that created the event.
Character Set: The character set used when the event was created.
Collation: The collation used when the event was created.
Database Collation: The collation of the database to which the event belongs.
By using the SHOW EVENTS statement, you can effectively manage and monitor the events scheduled by the MySQL Event Scheduler. This information can be crucial for ensuring that scheduled tasks are executed as intended and that the Event Scheduler is functioning properly.