MySQL error code
MySQL error 4012
MySQL server error 4012 is ER_STARTING_REPLICA_MONITOR_IO_THREAD, reported with SQLSTATE HY000.
The Replica Monitor thread failed to start.
| Error | 4012 |
|---|---|
| Name | ER_STARTING_REPLICA_MONITOR_IO_THREAD |
| SQLSTATE | HY000 |
| Group | Server errors |
Source: MySQL 8.4 Error Reference