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POMySQL is stuck in sorting state
 

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    <p>Lately i have an issue with my website, the mysql load reaches 800% and most of the queries are stuck in "Sorting Result" set.</p> <p>The issue is that i've made a test. Same query with 1 result set, with sorting was taking 9,8 seconds and without it takes 0.02 seconds. The query contains where conditions and group by.</p> <p>The sql is optimized, the search is made in indexed fields and everything went fine until couple of days ago. No traffic spike, no code change, nothing.</p> <p>Did you had this issue in the past or do you have any idea how can i fix it?</p> <p>Thanks</p> <p>Edit: The explain of the query:</p> <pre><code> id: 1 select_type: SIMPLE table: m type: range possible_keys: posterid_to_idx,to,poster_id key: posterid_to_idx key_len: 8 ref: NULL rows: 6 Extra: Using where; Using filesort </code></pre> <p>Again, same query worked fine couple of days ago.</p> <pre><code> `id` int(11) NOT NULL AUTO_INCREMENT, `body` longtext NOT NULL, `poster_id` int(11) NOT NULL, `poster_name` varchar(50) NOT NULL, `to` int(11) NOT NULL, `added` int(11) NOT NULL, `picture` varchar(64) NOT NULL, `folder` int(11) DEFAULT NULL, `read` tinyint(1) NOT NULL DEFAULT '0', PRIMARY KEY (`id`), KEY `posterid_to_idx` (`poster_id`,`to`), KEY `to` (`to`), KEY `poster_id` (`poster_id`), KEY `msg` (`id`,`poster_id`,`to`), KEY `added` (`added`) ) ENGINE=InnoDB AUTO_INCREMENT=37548617 DEFAULT CHARSET=latin1 SELECT SQL_CALC_FOUND_ROWS m.body, m.id, m.poster_id, m.poster_name, m.to, m.added, m.picture, m.folder FROM messages m WHERE ((m.poster_id = '1885585' OR m.poster_id = '1886341') AND (m.to = '1886341' OR m.to = '1885585')) ORDER BY m.id DESC LIMIT 0, 10 </code></pre> <p>Top Output:</p> <pre><code>CPU: 6.0% user, 0.0% nice, 38.8% system, 0.2% interrupt, 55.0% idle Mem: 11G Active, 1400M Inact, 5451M Wired, 87M Cache, 4923M Buf, 29G Free Swap: 8000M Total, 8000M Free </code></pre>
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    1. COMaybe the index you sorted on just outgrew the available cache space?
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    2. COwhat version of mysql? MyISAM or InnoDB?
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      1. USEric Petroelje
    3. CO@EricPetroelje - Version 5.5.32-log Source distribution and table InnoDB JoachimIsaksson - I have no idea how to check that :(
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