EC
1590
MariaDBERRORNotableEventsHIGH confidence

Event cannot be deleted

Production Risk

Low — the DROP EVENT fails; the event continues to run.

What this means

The event scheduler cannot delete an event from the queue, usually because the event is currently executing.

Why it happens
  1. 1Attempting to DROP EVENT while the event is actively executing.
  2. 2Internal queue management error in the event scheduler.
How to reproduce
trigger — this will error
trigger — this will error
DROP EVENT my_long_running_event; -- while event is executing

expected output

ERROR 1590 (HY000): The event cannot be deleted since the event thread is currently executing

Fix 1

Wait for event to finish, then drop it

Wait for event to finish, then drop it
-- Check if the event is running:
SHOW PROCESSLIST;
-- Wait for completion, then:
DROP EVENT my_long_running_event;

Why this works

Wait for the current event execution to complete before dropping it.

Fix 2

Disable the event first

Disable the event first
ALTER EVENT my_long_running_event DISABLE;
-- Wait for current execution to finish, then:
DROP EVENT my_long_running_event;

Why this works

Disabling prevents future executions while allowing the current one to finish.

Sources
Official documentation ↗

MySQL 8.0 — 1590 ER_EVENT_CANNOT_DELETE

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