EC
1552
MySQLERRORCommonEventsHIGH confidence

Failed to open mysql.event table

Production Risk

Critical — all event operations will fail until the table is repaired.

What this means

ER_EVENT_OPEN_TABLE_FAILED (1552, SQLSTATE HY000) is raised when MySQL cannot open the mysql.event table needed to read or write event metadata.

Why it happens
  1. 1mysql.event table is missing, corrupt, or has the wrong structure
  2. 2MySQL upgrade left mysql.event in an incompatible format
How to reproduce
trigger — this will error
trigger — this will error
SHOW EVENTS;  -- Fails if mysql.event is inaccessible

expected output

ERROR 1552 (HY000): Failed to open mysql.event

Fix

Run mysql_upgrade to repair the mysql schema

Run mysql_upgrade to repair the mysql schema
-- From command line:
mysql_upgrade -u root -p

-- Or repair directly:
mysqlcheck --repair mysql event -u root -p

Why this works

mysql_upgrade repairs and updates system tables including mysql.event.

Version notes
MySQL 8.0

Event metadata is stored in the data dictionary; mysql_upgrade is replaced by the upgrade procedure.

Sources
Official documentation ↗

MySQL 8.0 — 1552 ER_EVENT_OPEN_TABLE_FAILED

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