<p>MySQL cannot update the event scheduler queue because of internal corruption or privilege issues.</p>
<p>MySQL Error 1570: ER_EVENT_MODIFY_QUEUE_ERROR signals that the internal event scheduler failed while modifying its execution queue, usually due to a corrupted mysql.event table, missing privileges, or a known bug. Disable the scheduler, repair or recreate the affected events, then restart MySQL to clear the queue.</p>
Internal scheduler error %d
MySQL raises ERROR 1570 (HY000): ER_EVENT_MODIFY_QUEUE_ERROR when the event scheduler thread cannot update its internal execution queue. The scheduler aborts the current CREATE EVENT or ALTER EVENT statement, leaving the event disabled and potentially blocking other timed tasks.
This internal failure appears during event definition, server startup, replication relay processing, or after a restore. It signals corruption in the mysql.event system table, scheduler bugs, or missing privileges. Because scheduled jobs might not run, production data loads and purges can stop unexpectedly.
Damaged rows in mysql.event or mismatched column definitions after an upgrade are the most frequent triggers. Privilege misconfiguration on the mysql system schema prevents the scheduler from reading or writing the event metadata and generates the queue error.
Insufficient memory, full disk, or a server bug in MySQL 5.7.22 to 5.7.25 can also result in the scheduler failing to enqueue the event. Restoring dumps between different time zone tables or disabling the event scheduler mid transaction are other causes.
1 Disable the scheduler: SET GLOBAL event_scheduler = OFF; 2 Identify the event: SELECT name, status FROM mysql.event WHERE status = 'ENQUEUE'; 3 Dump the event definition: SHOW CREATE EVENT db.evt; 4 Drop and recreate the problematic event. 5 Run CHECK TABLE mysql.event QUICK and repair if needed. 6 Re enable the scheduler: SET GLOBAL event_scheduler = ON;
If corruption persists, export all events, drop mysql.event, execute mysql_upgrade, then import the events back. Upgrading to the latest patch version or Percona Server often eliminates known scheduler bugs.
Continuous Integration pipelines that rapidly drop and recreate events can hit race conditions. Add DROP EVENT IF EXISTS before CREATE EVENT and wait until EVENT_SCHEDULER is ON before next schema step.
After point in time recovery the relay log can replay half of an ALTER EVENT statement. Running FLUSH TABLES, restarting MySQL, then running ALTER EVENT to reset status clears the queue.
Lock schema migrations that modify events to a maintenance window and test on staging with the same MySQL minor version. Enable error logging with log_error_verbosity = 3 to surface early signs of scheduler trouble.
Schedule periodic CHECK TABLE mysql.event, keep time zone tables updated, and always include events when dumping and restoring databases.
Error 1595 EVENT_ALREADY_EXISTS occurs if you attempt to create a duplicate event. Ensure unique names or add IF NOT EXISTS. Error 1524 ER_GRANT_WRONG_HOST_OR_USER arises when incorrect privileges are set on mysql.event; grant EVENT privilege properly. Error 1530 ER_INVALID_PARAMETER_NO_LIST triggers when an event has invalid interval syntax; fix the ON SCHEDULE clause.
Galaxy tracks every CREATE EVENT and ALTER EVENT command in version control and highlights scheduler errors inline. The AI copilot suggests safe ALTER EVENT statements and warns about duplicate names, helping teams avoid ER_EVENT_MODIFY_QUEUE_ERROR in the first place.
Bit rot, abrupt power loss, or inconsistent restores can corrupt rows in the system table, causing the scheduler to fail when modifying the queue.
Removing EVENT or SUPER privileges from the scheduler process user stops it from writing metadata and triggers ER_EVENT_MODIFY_QUEUE_ERROR.
Upgrading without running mysql_upgrade leaves outdated columns in mysql.event that break queue operations.
Certain MySQL 5.7 builds include a bug that crashes the scheduler thread during ALTER EVENT, resulting in the queue error.
Occurs when an event with the same name already exists in the schema.
Raised if an event definition contains an invalid INTERVAL value.
Thrown from stored procedures using SIGNAL when a custom error is generated.
Query mysql.event for rows with status column set to ENQUEUE or DISABLED and inspect the last_modified column to locate the recent failing event.
Dropping mysql.event is safe after exporting all event definitions. Always run mysql_upgrade afterward to recreate the table structure before reimporting events.
Yes, if the event definition appears in binary logs a replica may stop with the same error. Fix on the primary and replicate the corrected event definition.
Galaxy surfaces MySQL error messages in the result pane and tags queries that modify events, making it easy to notice ER_EVENT_MODIFY_QUEUE_ERROR instantly.
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