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Re: DELETE performance problem
Posted by: Bradford Folkens
Date: January 30, 2005 04:46PM

I wish it were only that easy... Unfortunately the table in question is relatively high-availability - and I can't spare a drop, create, and then rename.

I've begun to play with removing columns in the unique index, and the time it takes to delete has dropped from 24 hours+ (finally canceled) to 10 hours.... So I wonder if there is a specific problem with the unique index?

I probably don't have a full understanding of how a 2-table DELETE works (with indexes, etc). But after watching the SHOW INNODB STATUS for a while - it still seems odd to me that it would do 1 delete every 2-3 seconds and read *so* many records in the meantime (this was really the only query on the box)...

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