<p>MySQL cannot start the Event Scheduler because essential system tables are corrupted or missing.</p>
<p>MySQL Error 1577: ER_EVENTS_DB_ERROR occurs when the Event Scheduler sees damaged system tables such as mysql.event. Run mysql_upgrade, then restart MySQL to recreate or repair the tables and clear the error.</p>
Cannot proceed because system tables used by Event
Error 1577 appears at server start when MySQL attempts to enable the Event Scheduler and finds that system tables like mysql.event, mysql.proc, or mysql.db are corrupted, incomplete, or use an outdated format.
The server logs contain the message Cannot proceed because system tables used by Event Scheduler were found damaged at server start. As a safety mechanism, MySQL disables the Event Scheduler until the tables are fixed.
The primary trigger is schema inconsistency between MySQL binaries and the mysql system schema after an upgrade, crash, or manual file manipulation. Damaged metadata prevents event definitions from loading.
Running an outdated mysql_upgrade, filesystem corruption, or partial restore operations often leave system tables in an unusable state, producing the 1577 error on restart.
First, back up your data directory. Then run the bundled mysql_upgrade utility with the same user that owns the MySQL service. mysql_upgrade recreates or updates damaged system tables.
If mysql_upgrade is unavailable, manually repair tables with CHECK TABLE and REPAIR TABLE, or drop and recreate the mysql.event table using mysql_upgrade_source.sql.
After OS package upgrades, MySQL binaries might be newer than system tables. Running mysql_upgrade synchronizes formats and clears the error.
If the server crashed during a DDL on mysql.event, use InnoDB recovery followed by ALTER TABLE mysql.event ENGINE=InnoDB to rebuild the table.
Always execute mysql_upgrade immediately after version upgrades. Automate this step in deployment pipelines or configuration management tools.
Enable scheduled CHECK TABLE on mysql schema and monitor the error log for scheduler-related warnings. Maintain reliable backups so corrupted system tables can be restored quickly.
Error 1578 (ER_EVENT_SET_VAR_ERROR) signals failure when setting event variables. Running mysql_upgrade often resolves both errors simultaneously.
Error 1545 (ER_PLUGGABLE_PROTOCOL_COMMANDS) arises from mismatched system table versions, again fixed by mysql_upgrade or manual table recreation.
Upgrading MySQL binaries without running mysql_upgrade leaves mysql.event in an older format the new server cannot read.
An unexpected shutdown during writes to mysql.event can corrupt pages, triggering error 1577 on restart.
Restoring only user databases and ignoring the mysql schema removes required metadata tables, disabling the Event Scheduler.
Incorrect ownership or permissions on mysql.* files stop the server from opening tables, producing the damaged table error.
Indicates problems while setting event variables. Often resolved with mysql_upgrade.
Occurs when a plugin table is out of sync. Similar repair steps apply.
Signals failure to store a new event due to damaged system tables or insufficient privileges.
mysql_upgrade locks tables briefly but usually finishes quickly. Schedule during low traffic windows to avoid user impact.
Deleting system tables is risky. Always back up first and prefer mysql_upgrade or REPAIR TABLE to recreate safely.
Setting EVENT_SCHEDULER=ON will not work until the damaged tables are repaired, so run mysql_upgrade first.
Galaxy surfaces MySQL server errors in the Results pane, helping teams notice 1577 quickly and access saved repair scripts.
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