Error
Error Code:
3633
MySQL Error 3633: Concurrent DDL Operation Detected
Description
This error occurs when MySQL detects that a Data Definition Language (DDL) operation, such as `ALTER TABLE` or `CREATE INDEX`, is being performed concurrently with another database operation. It signals a conflict where multiple schema-modifying statements or a schema modification and a data operation are clashing, often on the same database objects.
Error Message
Concurrent DDL is performed during the operation. Please try again.
Known Causes
3 known causesMultiple Concurrent DDL Operations
Another DDL statement (e.g., ALTER TABLE, DROP INDEX) is already active on the same or related database objects, leading to a contention.
DDL Conflict with Active Transaction
A DDL statement is attempting to modify a table that is currently involved in a long-running `SELECT` or `DML` transaction, causing a lock conflict.
Automated Schema Migration Contention
Automated deployment or migration scripts running in parallel might initiate conflicting DDL operations on the same database objects.
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