Re: how to optimise query for 10+ millions records
Posted by:
Rick James
Date: February 18, 2012 07:18AM
Using indexed fields inside function calls (such as IF()) makes it so the indexes cannot be used. Reforumate thus:
JOIN IN_ROUTE on p_CarrierType = 0 AND axecdr.IN_Route = IN_ROUTE.VALUE
JOIN OUT_ROUTE ON p_CarrierType = 1 AND axecdr.OUT_Route = OUT_ROUTE.VALUE
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