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POMysql Slow Insert
 

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    <p>I have the following InnoDB table:</p> <pre><code>+-----------+-----------+------+-----+-------------------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+-----------+------+-----+-------------------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | doc_id | char(32) | NO | | NULL | | | staff | char(18) | NO | | NULL | | | timestamp | timestamp | NO | MUL | CURRENT_TIMESTAMP | | +-----------+-----------+------+-----+-------------------+----------------+ </code></pre> <p>With these keys:</p> <pre><code>+--------------+------------+-----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | +--------------+------------+-----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+ | staff_online | 0 | PRIMARY | 1 | id | A | 277350 | NULL | NULL | | BTREE | | | staff_online | 1 | timestamp | 1 | timestamp | A | 277350 | NULL | NULL | | BTREE | | | staff_online | 1 | staff_timestamp | 1 | timestamp | A | 277350 | NULL | NULL | | BTREE | | | staff_online | 1 | staff_timestamp | 2 | staff | A | 277350 | NULL | NULL | | BTREE | | +--------------+------------+-----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+ </code></pre> <p>I just noticed that <code>in mysql-slow.log</code> I sometimes have an INSERT query on this table which takes more than 1 second</p> <pre><code>INSERT INTO `staff_online` (`doc_id`, `staff`, `timestamp`) VALUES ('150b60a0ab8c5888bdbbb80bd8b7f8a2', 'asia', '2011-01-29 16:52:54') </code></pre> <p>I'm really puzzled why it takes so long. How can I speed it up?</p> <p>BTW: Each day there're ~80 slow INSERTS and 40 slow UPDATES like this.</p>
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    1. USPeter G.
    1. USkalkin
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    1. COHow many rows are in the table, and are you sure all inserts are slow?
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      1. USjohn personna
    2. COThere are 277259 rows and only some inserts are slow (rare).
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    3. COYou seem to have two indexes, one by `timestamp` an another by `timestamp, staff`. The latter is sufficient to search by `timestamp`, you can drop the former.
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