performance - Mysql Find command has become very slow -

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each of web requests involved couple of 'select' queries. table in question went 75,000 rows ~90,000 , select command slowed taking ~100ms ~1.2s

what best way find reason of sudden performance drop? imagine key can not stored in memory , causing drop. how check that?

please advise.

it sounds mysql shifting internal table memory disk. classic "tipping-point" mysql performance drops off cliff once reaches size. when realize default mysql configuration extremely conservative (even so-called "huge" config) , several server settings can increased @ least order of magnitude.

the first avenue of exploration use explain on query , indications putting temporary table information on disk. more information available in mysql docs here , here


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