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    <p>Possible Improvements:</p> <p>First, you'll gain a couple microseconds per query if you name your fields instead of using SELECT posts.* which causes a schema lookup. Change your query to:</p> <pre><code>SELECT posts.post_n, posts.id, posts.date FROM posts, subscriptions WHERE posts.id=subscriptions.subscribe_id AND subscriptions.id=1 ORDER BY date DESC LIMIT 0, 15 </code></pre> <p>Next, this requires MySQL 5.1 or higher, but you might want to consider partitioning your tables. You might consider KEY partitioning for both tables. </p> <p>This should get you started. <a href="http://dev.mysql.com/doc/refman/5.1/en/partitioning-types.html" rel="nofollow">http://dev.mysql.com/doc/refman/5.1/en/partitioning-types.html</a> </p> <p>E.g.</p> <pre><code>SET SQL_MODE = 'ANSI'; -- to allow default date CREATE TABLE IF NOT EXISTS `posts` ( `post_n` int(10) NOT NULL auto_increment, `id` int(10) default NULL, `date` datetime NOT NULL default '0000-00-00 00:00:00', PRIMARY KEY (`post_n`,`id`), KEY `id` (`id`), KEY `date` (`date`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin PARTITION BY KEY(id) PARTITIONS 32; -- CREATE TABLE IF NOT EXISTS `subscriptions` ( `subscription_n` int(10) NOT NULL auto_increment, `id` int(10) NOT NULL, `subscribe_id` int(10) NOT NULL, PRIMARY KEY (`subscription_n`,`subscribe_id`), KEY `id` (`id`), KEY `subscribe_id` (`subscribe_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin PARTITION BY KEY(subscribe_id) PARTITIONS 32; </code></pre> <p>I had to adjust your primary key a bit. So, beware, this may NOT work for you. Please test it and make sure. I hope, this does though. Make sure to run sysbench against the old and new structures/queries to compare results before going to production. :-)</p>
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    1. COoh yeah, it`s something new for me. i will update mysql version and test it, thank you! :)
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    2. COafter adding partitioning speed increased in 2, it`s good. i need to test it more, thanx.
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    3. COit always going throw all partitions, but if i order it in desc by date, than i need only last 15, always, maybe exists some another way for partitioning, do you know? sorry for my english.
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