Error
Error Code:
1854
MySQL Error 1854: Auto-increment column lock required
Description
Error 1854 indicates that MySQL cannot acquire the necessary table lock to add or modify an AUTO_INCREMENT column. This often happens when other active transactions or DML operations are running on the table, preventing an exclusive schema lock from being granted. MySQL requires this lock to ensure data consistency during such structural changes.
Error Message
Adding an auto-increment column requires a lock
Known Causes
4 known causesActive Transactions
Other transactions are currently reading from or writing to the target table, preventing MySQL from acquiring an exclusive lock for schema modification.
Long-Running Queries
A query that takes a significant amount of time to complete is holding a lock on the table, blocking the `ALTER TABLE` statement.
Lock Wait Timeout
The `ALTER TABLE` statement timed out waiting for the necessary lock to be released by other operations, configured by `innodb_lock_wait_timeout`.
Explicit Table Locks
Another database session has explicitly locked the table using `LOCK TABLES` or similar commands, preventing schema changes.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service