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SQLProfile: quickie plugin to run DB queries through 'explain' and log ones that trigger filesort or temporary table

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Brion Vibber 2010-12-17 11:41:40 -08:00
parent 446c2ab666
commit 66b89de256
1 changed files with 66 additions and 0 deletions
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plugins/SQLProfile/SQLProfilePlugin.php Normal file
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<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
if (!defined('STATUSNET')) {
exit(1);
}
/**
* Check DB queries for filesorts and such and log em.
*
* @package SQLProfilePlugin
* @maintainer Brion Vibber <brion@status.net>
*/
class SQLProfilePlugin extends Plugin
{
private $recursionGuard = false;
function onPluginVersion(&$versions)
{
$versions[] = array('name' => 'SQLProfile',
'version' => STATUSNET_VERSION,
'author' => 'Brion Vibber',
'homepage' => 'http://status.net/wiki/Plugin:SQLProfile',
'rawdescription' =>
_m('Debug tool to watch for poorly indexed DB queries'));
return true;
}
function onStartDBQuery($obj, $query, &$result)
{
if (!$this->recursionGuard) {
$this->recursionGuard = true;
$xobj = clone($obj);
$explain = $xobj->query('EXPLAIN ' . $query);
$this->recursionGuard = false;
while ($xobj->fetch()) {
$extra = $xobj->Extra;
$evil = (strpos($extra, 'Using filesort') !== false) ||
(strpos($extra, 'Using temporary') !== false);
if ($evil) {
$xquery = $xobj->sanitizeQuery($query);
common_log(LOG_DEBUG, "$extra | $xquery");
}
}
}
return true;
}
}