Error
Error Code:
3960
MySQL Error 3960: Group Replication Operation Blocked
Description
This error occurs when an attempt is made to perform an operation that is incompatible with MySQL Group Replication actively running. It signifies that the intended action could compromise data consistency or cluster integrity if executed while Group Replication is online.
Error Message
This operation cannot be performed while Group Replication is running; run STOP GROUP_REPLICATION first
Known Causes
4 known causesModifying Replication Configuration
Attempting to alter Group Replication settings, such as member configuration or plugin options, while the group is active.
Performing Schema Changes
Executing DDL statements (e.g., ALTER TABLE, DROP DATABASE) on tables or databases that are part of the Group Replication setup.
Managing Group Members
Trying to add or remove members, or performing other cluster management operations that require a quiescent state.
Database Maintenance Tasks
Executing certain maintenance procedures, upgrades, or patches that necessitate Group Replication to be temporarily offline.
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