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Re: Selects are slow when blob field?
Posted by: Harrison Fisk
Date: November 23, 2004 05:29PM

Hi,

A couple of things to note.

First, you might want to consider a combined index on (recordid, tablename), rather than two seperate ones. This will allow MySQL to find the rows requested faster.

Second, you never mentioned the storage engine that you are using. With MyISAM, it will always read the entire row (including the blob in this case) even if you aren't selecting it. Moving the blob to a separate table and doing a join when it is actually required would be highly recommended for performance.

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

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