Comments on: MySQL Table Locking & WordPress Scalability

By: Mark Cahill

Mark Cahill — Wed, 08 Dec 2010 18:00:38 +0000

We are talking here about what was then cutting edge WP 2.6. Now very out of date.

If you’re having a specific problem with scalability, email me and I’ll see if I can help.

By: Kotak

Kotak — Mon, 06 Dec 2010 03:18:59 +0000

hi, i’m interested with this paragraph :

“…a simple date limit on the query brought it’s execution time down from 35 seconds to milliseconds…”

could you explain about it in more details?

By: Mark Cahill

Mark Cahill — Fri, 06 Mar 2009 13:25:00 +0000

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

Craig — Fri, 06 Mar 2009 06:54:40 +0000

Did you make changes to the core to fix that? or just fixed the plugins?