Question

I read article about the event scheduler on MySql.Then I got this structure,

CREATE
[DEFINER = { user | CURRENT_USER }]
EVENT
[IF NOT EXISTS]
event_name
ON SCHEDULE schedule
[ON COMPLETION [NOT] PRESERVE]
[ENABLE | DISABLE | DISABLE ON SLAVE]
[COMMENT 'comment']
DO event_body;

I got some interested thing to know about it,
1. Could this event schedule havent expired time?
2. What is the ENABLE | DISABLE | DISABLE ON SLAVE mean?

Any respon will be appreciate,Thx.

Answer 1

1. Could this event schedule havent expired time? Use – ON COMPLETION PRESERVE
2. What is the ENABLE | DISABLE | DISABLE ON SLAVE mean? ENABLE/DISABLE – means event is active/inactive.

DISABLE ON SLAVE (from the documentation) – is set for the status of an event on a replication slave to indicate that the event was created on the master and replicated to the slave, but is not executed on the slave.