EC
1554
MySQLERRORCommonEventsHIGH confidence

Column count of mysql.event is wrong — table may be corrupt

Production Risk

Critical — all event operations will fail until the schema is corrected.

What this means

ER_COL_COUNT_DOESNT_MATCH_CORRUPTED_V2 (1554, SQLSTATE HY000) is raised when the mysql.event table has fewer or more columns than expected, indicating corruption or an upgrade issue.

Why it happens
  1. 1MySQL upgrade left mysql.event with an incompatible schema
  2. 2mysql.event was manually modified or partially upgraded
How to reproduce
trigger — this will error
trigger — this will error
SHOW EVENTS;  -- Returns error if mysql.event has wrong column count

expected output

ERROR 1554 (HY000): Column count of mysql.event is wrong. Expected 22, found 20. The table is probably corrupted

Fix

Run mysql_upgrade to restore the correct schema

Run mysql_upgrade to restore the correct schema
-- From command line:
mysql_upgrade -u root -p --force

-- Check after upgrade:
SHOW EVENTS;

Why this works

mysql_upgrade recreates system tables with the correct schema for the current MySQL version.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 1554 ER_COL_COUNT_DOESNT_MATCH_CORRUPTED_V2

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