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MySQL Replication Falling Behind (Lag, Delay) Notes (Doc ID 2256128.1)

Last updated on OCTOBER 14, 2020

Applies to:

MySQL Server - Version 5.6 and later
Information in this document applies to any platform.



On a Replication scenario, the slave server is reported as being lagging or falling behind the master

being the usual symptom the existence of  "seconds_behind_master" different from zero when issuing the command:



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In this Document
 Understanding seconds_behind_master
 What is lagging ?
 All Slaves experiencing the issue
 I/O Thread lagging
 SQL Thread Lagging

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