Print_page_counter and print_mail_page_counter both have indexes on "path" which is how I am accessing them.

I added "AND v.content_type='node'" to the votingapi_cache because it has an index on content_type and content_id. That cut the time in half.

Radioactivity has an index on id, class, and decay_profile (in that order). My query has id and class; but does not have decay_profile.

Thank you, it is faster now, but I'd still like it even faster.

So I now have

SELECT n.nid, n.title, n.status, n.created, n.uid, ra.energy, nc.totalcount, nc.daycount,
ppc.totalcount AS printcount, pmc.sentcount, r.realname,
cs.comment_count, v.value AS votes
FROM node n
INNER JOIN radioactivity ra ON ra.id=n.nid AND ra.class='node'
INNER JOIN realname r ON r.uid=n.uid
LEFT JOIN node_counter nc ON nc.nid=n.nid
LEFT JOIN node_comment_statistics cs ON cs.nid=n.nid
LEFT JOIN votingapi_cache v ON v.content_id=n.nid AND v.function='sum' AND v.content_type='node'
LEFT JOIN print_page_counter ppc ON ppc.path=CONCAT('node/', n.nid)
LEFT JOIN print_mail_page_counter pmc ON pmc.path=CONCAT('node/', n.nid)
WHERE n.type = 'blog' AND n.status = 1
ORDER BY ra.energy DESC
LIMIT 10

Nancy

From: Domenic Santangelo <domenics@gmail.com>
To: development@drupal.org
Sent: Mon, July 19, 2010 1:55:48 PM
Subject: Re: [development] MySql Performance Problem

On Jul 19, 2010, at 10:18 AM, nan wich wrote:

Can someone suggest ways to improve the performance?

First thing to do: indexes on the radioactivity, print_page_counter, print_mail_page_counter and (possibly) votingapi_cache tables. I say possibly on that one because I can't remember the behavior of that table and if indexing it might decrease performance elsewhere.

hth,