8.12.5.8. Event Scheduler Thread States

These states occur for the Event Scheduler thread, threads that are created to execute scheduled events, or threads that terminate the scheduler.

Clearing

The scheduler thread or a thread that was executing an event is terminating and is about to end.
Initialized

The scheduler thread or a thread that will execute an event has been initialized.
Waiting for next activation

The scheduler has a nonempty event queue but the next activation is in the future.
Waiting for scheduler to stop

The thread issued SET GLOBAL event_scheduler=OFF and is waiting for the scheduler to stop.
Waiting on empty queue

The scheduler's event queue is empty and it is sleeping.