Comments on: MySQL Table Locking & WordPress Scalability http://www.allthingscahill.com/2008/07/mysql-table-locking-wordpress-scalability/ The online home for Mark Cahill, and indeed, all things Cahill! Wed, 01 Sep 2010 16:15:26 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Mark Cahill http://www.allthingscahill.com/2008/07/mysql-table-locking-wordpress-scalability/comment-page-1/#comment-1105 Mark Cahill Fri, 06 Mar 2009 13:25:00 +0000 http://www.allthingscahill.com/?p=540#comment-1105 We went through the code and made sure there were reasonable limits on what we were attempting to return. Basically we found there were several "select * from wp_posts" querires that were then having 99% of the results trashed in the code that processed the them. So simply adding a "limit 10" rather than returning everything then dumping it in the code later was the answer. Best advice is to turn of slow query logging for a couple days and watch what turns up. You'll see the same queries over and over again, and those are obviously the ones that need to be optimized if possible. Add an index, etc. You hint at something I've been meaning to do: get Glenn Nadeau to write a guest post on these types of issues. We went through the code and made sure there were reasonable limits on what we were attempting to return. Basically we found there were several “select *
from wp_posts” querires that were then having 99% of the results trashed in the code that processed the them. So simply adding a “limit 10″ rather than returning everything then dumping it in the code later was the answer.

Best advice is to turn of slow query logging for a couple days and watch what turns up. You’ll see the same queries over and over again, and those are obviously the ones that need to be optimized if possible. Add an index, etc.

You hint at something I’ve been meaning to do: get Glenn Nadeau to write a guest post on these types of issues.

]]> By: Craig http://www.allthingscahill.com/2008/07/mysql-table-locking-wordpress-scalability/comment-page-1/#comment-1104 Craig Fri, 06 Mar 2009 06:54:40 +0000 http://www.allthingscahill.com/?p=540#comment-1104 Did you make changes to the core to fix that? or just fixed the plugins? Did you make changes to the core to fix that? or just fixed the plugins?

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