MySQL: Using CONNECT to Quickly Verify Replication Health
Posted by Gerry Narvaja on Jan 27, 2009
One very helpful use of the technique Sheeri described in Remote connections without leaving the mysql shell is making sure that replication is working properly.
According to the MySQL Reference Manual’s section on SHOW SLAVE STATUS Syntax, it shows information corresponding to the slave thread in the slave server. When replication is broken, however, or not working properly due to network issues between master and slave, this information may not be accurate. This has improved over recent releases, but it’s still not perfect.
The question, then, is: how to be 100% sure (or as close as you can get to 100%) that replication is running fine? The answer, as offered by Sheeri: use CONNECT.
Example
- Log into the slave using the mysql client and issue
SHOW SLAVE STATUS:
