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Re: MAX performance degrades
Posted by: Harrison Fisk
Date: March 11, 2005 02:07PM

Hi,

If you create a combined index on (C3, C4, C2) then it should be able to resolve the MAX using only the index. Indexes don't give a constant time, but it will only degrade slowly (if you even notice it) compared to the linear degrade you noticed before.

If that still doesn't help, please post the output of your EXPLAIN statement both with the new index and without it.

Harrison Fisk, Trainer and Consultant
MySQL AB, www.mysql.com

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