MySQL 8.3 Release Notes
These states occur for the Event Scheduler thread, threads that are created to execute scheduled events, or threads that terminate the scheduler.
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The scheduler thread or a thread that was executing an event is terminating and is about to end.
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The scheduler thread or a thread that executes an event has been initialized.
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The scheduler has a nonempty event queue but the next activation is in the future.
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The thread issued
SET GLOBAL event_scheduler=OFFand is waiting for the scheduler to stop. -
The scheduler's event queue is empty and it is sleeping.