Modifying A Scheduled Event In MySQL

In MySQL, you need to use the ALTER EVENT statement to change a scheduled event. You can modify the SCHEDULE clause to set the new recurring time for the event.

Here is the general syntax for altering a scheduled event:

ALTER EVENT event_name
ON SCHEDULE schedule
[ON COMPLETION [NOT] PRESERVE]
[ENABLE | DISABLE | DISABLE ON SLAVE]
[COMMENT 'string']
[DO event_body]

The schedule It can be one of the following:

1. AT timestamp [+ INTERVAL interval]

• Executes the event once at a specific timestamp, with an optional interval.

1. EVERY interval

• Executes the event at regular intervals. You can specify the gap in terms of days, hours, minutes, etc.

1. EVERY interval STARTS timestamp [+ INTERVAL interval] ENDS timestamp [+ INTERVAL interval]

• Executes the event at regular intervals, starting and ending at specific timestamps.

Here is an example of how to change a scheduled event’s recurring time:

Let’s say you have an event named my_event That is scheduled to run every 1 hour, and you want to change it to run every 30 minutes instead. You can do this with the following command:

ALTER EVENT my_event
ON SCHEDULE EVERY 30 MINUTE;

If you want the event to start at a specific time and then recur every 30 minutes, you can do it like this:

ALTER EVENT my_event
ON SCHEDULE EVERY 30 MINUTE STARTS '2023-08-17 12:00:00';

If you want the event to start and end at particular times and recur every 30 minutes between those times, you can do it like this:

ALTER EVENT my_event
ON SCHEDULE EVERY 30 MINUTE 
STARTS '2023-08-17 12:00:00' 
ENDS '2023-12-31 12:00:00';

Please note that to alter an event in MySQL, you must have the EVENT privilege for the database that the event is associated with, or the global EVENT Privilege. Additionally, the MySQL event scheduler must be enabled for events to run. You can check if the event scheduler is ON or OFF by running the following command:

SHOW VARIABLES LIKE 'event_scheduler';

To allow the event scheduler, you can run this command:

SET GLOBAL event_scheduler = ON;

Or you can add the following line in the my.cnf or my.ini configuration file under the [mysqld] Section:

event_scheduler=ON

After modifying the configuration file, you must restart the MySQL server for the changes to take effect.

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