EC
1556
MySQLERRORNotableEventsHIGH confidence

Failed to delete the event from mysql.event

Production Risk

Low — the event may continue to appear but not execute again.

What this means

ER_EVENT_CANNOT_DELETE (1556, SQLSTATE HY000) is raised when the event scheduler cannot delete an event from mysql.event after it has completed execution.

Why it happens
  1. 1Storage error in mysql.event preventing deletion
  2. 2Event marked ON COMPLETION NOT PRESERVE tried to self-delete but failed
How to reproduce
trigger — this will error
trigger — this will error
-- Occurs internally when the event scheduler tries to delete a completed event

expected output

ERROR 1556 (HY000): Failed to delete the event from mysql.event

Fix

Check the mysql.event table health

Check the mysql.event table health
CHECK TABLE mysql.event;
REPAIR TABLE mysql.event;

-- Manually remove the event if needed:
DROP EVENT IF EXISTS my_event;

Why this works

Repairing the event table resolves storage errors that prevent event deletion.

Sources
Official documentation ↗

MySQL 8.0 — 1556 ER_EVENT_CANNOT_DELETE

Content generated with AI assistance and reviewed for accuracy. Found an error? hello@errcodes.dev

← All MySQL errors