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Re: Poor Performance with tables over 1Million entries
Posted by: Aftab Khan
Date: April 09, 2009 02:52AM

2. Used OR and Group By with Having: ~0.3sec
SELECT * FROM DataMap
WHERE dataId IN (1,2,3)
GROUP BY itemId
HAVING COUNT(dataId)=3
LIMIT 20

I Replaced
dataId=1 OR dataId=2 OR dataId=3
with
dataId IN (1,2,3)

hopefully you will see a speed difference

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