Re: measuring slave lag without sysdate() - 4.1.13
Posted by:
Rick James
Date: February 08, 2012 02:09AM
The goal of replication is to have exactly the same stuff on the slave -- including NOW(), RAND(), etc.
The Heartbeat should insert NOW() (or SYSDATE()), let it replicate, then check to see how out-of-date the value is when you read it on the slave. You need to Master and Slave to be reasonably synchronized, say by NTP.
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