Error
Error Code:
1804
MySQL Error 1804: Cannot Clean Worker Tables
Description
Error 1804 indicates that MySQL is unable to clean up its internal worker information tables, which are typically used by the multi-threaded slave (MTS) for replication. This often points to an inconsistency or corruption in the replication metadata or an underlying system issue preventing file operations.
Error Message
Cannot clean up worker info tables. Additional error messages can be found in the MySQL error log.
Known Causes
4 known causesReplication Metadata Inconsistency
The internal state or metadata for MySQL's multi-threaded slave workers may be inconsistent or corrupted, preventing proper cleanup.
File System Access Issues
MySQL may lack the necessary permissions to access or modify the files storing worker information, or there might be underlying disk problems.
Server Resource Constraints
Insufficient disk space or other system resource limitations can hinder MySQL's ability to perform routine cleanup operations.
Improper Server Shutdown
An unclean or abrupt shutdown of the MySQL server can leave worker information tables in an inconsistent state, causing cleanup failures.
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