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Displaying posts with tag: daisy chain replication (reset)

How to measure MySQL slave lag accurately
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Kevin Burton wrote recently about why SHOW SLAVE STATUS is really not a good way to monitor how far behind your slave servers are, and how slave network timeouts can mess up the slave lag. I'd like to chime in and say this is exactly why I thought Jeremy Cole's MySQL Heartbeat script was such a natural fit for the MySQL Toolkit. It measures slave lag in a "show me the money" way: it looks for the effects of up-to-date replication, rather than asking the slave how far behind it thinks it is.

The slave doesn't even need to be

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