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Query taking 2 minutes [message #161905] Fri, 19 February 2010 10:33 Go to previous message
P_G_ is currently offline  P_G_
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Not strictly an installation issue, but not sure where this should go.

We are experiencing a few occasions during a day where the forum grinds to a halt due to locked queries. It is down to the query below, which takes anything between 85 and 120 seconds to run.

First off, when is it run, and is it something which can be disabled via a feature? Or is there an alternative way we can solve it or get around it?

It brings back around 15,000 records from the thread table.

Thanks
P_G_

SELECT
m.*, COALESCE(m.flag_cc, u.flag_cc) AS flag_cc, COALESCE(m.flag_country, u.flag_country) AS flag_country,
t.thread_opt, t.root_msg_id, t.last_post_id, t.forum_id,
f.message_threshold, f.name,
u.id AS user_id, u.alias AS login, u.avatar_loc, u.email, u.posted_msg_count, u.join_date, u.location,
u.sig, u.custom_status, u.icq, u.jabber, u.affero, u.aim, u.msnm, u.yahoo, u.skype, u.google, u.last_visit AS time_sec, u.users_opt,
l.name AS level_name, l.level_opt, l.img AS level_img,
p.max_votes, p.expiry_date, p.creation_date, p.name AS poll_name, p.total_votes,
pot.id AS cant_vote,
r.last_view,
mm.id AS md,
m2.subject AS thr_subject,
COALESCE(g2.group_cache_opt, g1.group_cache_opt) AS group_cache_opt
FROM
fud26_msg m
INNER JOIN fud26_thread t ON m.thread_id=t.id
INNER JOIN fud26_msg m2 ON m2.id=t.root_msg_id
INNER JOIN fud26_forum f ON t.forum_id=f.id
INNER JOIN fud26_cat c ON f.cat_id=c.id


INNER JOIN fud26_group_cache g1 ON g1.user_id=2147483647 AND g1.resource_id=f.id LEFT JOIN fud26_group_cache g2 ON g2.user_id=6927 AND g2.resource_id=f.id
LEFT JOIN fud26_read r ON r.thread_id=t.id AND r.user_id=6927
LEFT JOIN fud26_users u ON m.poster_id=u.id
LEFT JOIN fud26_level l ON u.level_id=l.id
LEFT JOIN fud26_poll p ON m.poll_id=p.id
LEFT JOIN fud26_poll_opt_track pot ON pot.poll_id=p.id AND pot.user_id=6927
LEFT JOIN fud26_mod mm ON mm.forum_id=f.id AND mm.user_id=6927
WHERE
m.apr=1

AND f.id=1


AND m.post_stamp > 1235529738 AND (r.id IS NULL OR r.last_view < m.post_stamp)
AND (mm.id IS NOT NULL OR (COALESCE(g2.group_cache_opt, g1.group_cache_opt) & 2) > 0)
ORDER BY
f.last_post_id ASC , t.last_post_date ASC , m.post_stamp ASC
LIMIT 0,50;
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