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How to enable or disable event scheduler in MySQL?
If the event scheduler is not enabled, you can set the event_scheduler system variable to enable and start it: Execute the SHOW PROCESSLIST command again to see the status of event scheduler thread: To disable and stop the event scheduler thread, you set event_scheduler system variable to OFF: The CREATE EVENT statement creates a new event.
Why are MySQL events referred to as scheduled events?
Therefore, sometimes MySQL events are referred to as scheduled events. MySQL Events are named object which contains one or more SQL statement. They are stored in the database and executed at one or more intervals. For example, you can create an event that optimizes all tables in the database that runs at 1:00 AM every Sunday.
How to create a new event in MySQL?
Creating new MySQL events. The CREATE EVENT statement creates a new event. Here is the basic syntax of the CREATE EVENT statement: CREATE EVENT [ IF NOT EXIST] event_name ON SCHEDULE schedule DO event_body. Code language: SQL (Structured Query Language) (sql) In this syntax:
Why does MySQL show no row when event is expired?
To shows all events in the database, you use the following statement: The output shows no row because the event is automatically dropped when it is expired. In this case, it is a one-time event and expired when its execution completed. To keep the event after it is expired, you use the ON COMPLETION PRESERVE clause.
How to enable scheduled event on master a?
Under normal circumstances, on Master A ( READ_ONLY=OFF) the events execute as per normal and adds the entry; On Master B ( READ_ONLY=ON) the events execute, but don’t insert an entry as they don’t have permission.
How does replication work in MySQL slave server?
Here is how MySQL replication works. All database operations are copied to the master’s binary log. Salves connect to the master and asks for the data. The slave servers get the masters binary log.