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Slow query - Using where; Using temporary; Using filesort

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  • Slow query - Using where; Using temporary; Using filesort

    Hey!

    I have some queries taking ~3-5 seconds to execute. With lots of queries being run all the time, it can take down the database.

    The query in question is

    SELECT partid, rtp.tableid, chainCount, type, charset, minLetters, maxLetters, `index`, chainLength, rtp.tableid, salt, CONVERT_TZ(DATE_ADD(NOW(), INTERVAL +2 DAY), @@global.time_zone, '+0:00') AS expiration
    FROM rainbowcrack_parts rtp
    INNER JOIN rainbowcrack_tables rtt ON rtp.tableid = rtt.tableid AND rtp.status = 0
    INNER JOIN rainbowcrack_tablesets rts ON rtt.tablesetid = rts.tablesetid
    WHERE type != 'lm'
    ORDER BY rts.priority DESC, rtp.partid ASC LIMIT 1;

    The table structure is the following:
    CREATE TABLE `rainbowcrack_parts` (
    `partid` int(11) NOT NULL auto_increment,
    `tableid` int(11) NOT NULL,
    `userid` int(11) default NULL,
    `chainStart` int(11) NOT NULL,
    `chainCount` int(11) NOT NULL,
    `ip` varchar(255) default NULL,
    `status` int(11) default NULL,
    `starttime` datetime default '0000-00-00 00:00:00',
    `finishedtime` datetime default '0000-00-00 00:00:00',
    `clientid` int(10) unsigned NOT NULL default '0',
    `creditvalue` float unsigned NOT NULL default '0',
    PRIMARY KEY (`partid`),
    KEY `tableid` (`tableid`),
    KEY `userid` (`userid`),
    KEY `creditvalue` (`creditvalue`),
    KEY `finishedtime` (`finishedtime`),
    KEY `status` (`status`)
    )

    and result of EXPLAIN is:

    1 SIMPLE rtp ref tableid,status status 5 const 41886 Using where; Using temporary; Using filesort
    1 SIMPLE rtt eq_ref PRIMARY,tablesetid,type PRIMARY 4 rainbowtables-distrrtgen.rtp.tableid 1 Using where
    1 SIMPLE rts eq_ref PRIMARY PRIMARY 4 rainbowtables-distrrtgen.rtt.tablesetid 1

    The table contains 668.000 rows

    I have added indexes, but still gets "using temporary; Using filesort".. Any ideas?
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