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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The Heartbeat should insert NOW() (or SYSDATE()), let it replicate, then check to see how out-of-date the value is when you read it on the slave.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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Re: measuring slave lag without sysdate() - 4.1.13
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February 08, 2012 02:09AM


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