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Cache problem ?


  • elpix
    Participant

    @elpix

    Hi all,

    I ask your help beacause I’ve already tried everything that I knew before to make a query work in few seconds

    I’m on BP 1.5.5/

    Before, everything was working well, but one day, access to our forum became very very long (170 s average).
    After many tests, I think that it’s a cache problem.

    Here is two queries that make me think that :

    SELECT t.*, g.id AS object_id, g.name AS object_name, g.slug AS object_slug
    FROM wp_bb_topics AS t
    INNER JOIN wp_bb_posts p ON p.topic_id=t.topic_id AND p.post_time=t.topic_start_time
    JOIN wp_bp_groups AS g
    LEFT JOIN wp_bp_groups_groupmeta AS gm ON g.id = gm.group_id
    WHERE (gm.meta_key = 'forum_id' AND gm.meta_value = t.forum_id) AND g.STATUS = 'public' AND t.topic_status = '0'
    ORDER BY t.topic_time
    LIMIT 20

    And the same without the “LIMIT”

    SELECT t.*, g.id AS object_id, g.name AS object_name, g.slug AS object_slug
    FROM wp_bb_topics AS t
    INNER JOIN wp_bb_posts p ON p.topic_id=t.topic_id AND p.post_time=t.topic_start_time
    JOIN wp_bp_groups AS g
    LEFT JOIN wp_bp_groups_groupmeta AS gm ON g.id = gm.group_id
    WHERE (gm.meta_key = 'forum_id' AND gm.meta_value = t.forum_id) AND g.STATUS = 'public' AND t.topic_status = '0'
    ORDER BY t.topic_time

    The first (with LIMIT) take 150 secondes (At the beginning, it was working well).
    But the second (without LIMIT) takes 1.5 secones !!!!

    When I’m in PHPmyADMIN, the “show full processlist” tell “copy to tmp table” during the 150 secondes.

    So my question is :
    Is there a cache limit I’ve reache with my DB (20.000 topics) ?
    Where I’ve to modified (I think in my.cnf), and what is the value to put (I’ve make a lot of test, without good results)?

    Thank you very much !

    Bye

Viewing 2 replies - 1 through 2 (of 2 total)

  • elpix
    Participant

    @elpix

    No one have an idea ?
    We tried to improve the buffers (all we can see in “show variable global”) but no results :(


    elpix
    Participant

    @elpix

    When I’m in PHPmyADMIN, the “show full processlist” tell “copy to tmp table” during the 150 secondes :(

Viewing 2 replies - 1 through 2 (of 2 total)

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