The event scheduler is very useful when some tables should be archived or purged periodically.
Check if the even scheduler is running by executing:
SHOW PROCESSLIST;
Check if the event scheduler is turned on:
SHOW VARIABLES WHERE VARIABLE_NAME = 'event_scheduler'
If the event log scheduler is not listed, try this:
SET GLOBAL event_scheduler = ON;
Afterwards, check again if it is listed. Keep in mind that the event scheduler won't start up after restart unless you also specify it in the my.ini file:
[mysqld]
...
event_scheduler = on
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mariadb