Answer by Rick James for Large No of MySQL running threads killing response...
Query cache off -- goodLarge history list -- Innodb stumbling over itself.Latency suddenly shot up -- dittoThread count suddenly shot up -- ditto.Possible causes:A long-running UPDATE or ALTER blocking...
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Yesterday, our MySQL's response time increased 20 times- select queries which earlier used to take 0.6-0.7 ms took 20ms, and updates even more- 60ms. The MySQL running threads count which usually stays...
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