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POMysql index configuration
 

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    <p>I have a table with 450000 row full of news. The table schema is like this:</p> <pre><code>CREATE TABLE IF NOT EXISTS `news` ( `id` int(11) NOT NULL auto_increment, `cat_id` int(11) NOT NULL, `title` tinytext NOT NULL, `content` text NOT NULL, `date` int(11) NOT NULL, `readcount` int(11) NOT NULL default '0', PRIMARY KEY (`id`), KEY `cat_id` (`cat_id`), KEY `cat_id_2` (`cat_id`,`id`), KEY `cat_id_date` (`cat_id`,`date`) ) ENGINE=MyISAM DEFAULT CHARSET=latin5 AUTO_INCREMENT=462679 ; </code></pre> <p>When i run a sql command like below to take some news for a page "x" of the category page it takes more than 15 seconds if x is over 100:</p> <pre><code>select * news where cat_id='4' order by id desc limit 150000,10; </code></pre> <p>explain shows that its using "where" and the index "cat_id_2"</p> <p>While writing this question i also checked a more simple sql query like this and it also took near to a minute:</p> <pre><code>select * from haberler order by id desc limit 40000,10; </code></pre> <p>if the sql is like the following one it takes just a few milliseconds:</p> <pre><code>select * from haberler order by id desc limit 20,10; </code></pre> <p>My my.cnf configuration is like this:</p> <pre><code>skip-locking skip-innodb query_cache_limit=1M query_cache_size=256M query_cache_type=1 max_connections=30 interactive_timeout=600000 #wait_timeout=5 #connect_timeout=5 thread_cache_size=384 key_buffer=256M join_buffer=4M max_allowed_packet=16M table_cache=1024 record_buffer=1M sort_buffer_size=64M read_buffer_size=16M max_connect_errors=10 # Try number of CPU's*2 for thread_concurrency thread_concurrency=2 myisam_sort_buffer_size=128M long_query_time = 1 log_slow_queries = /var/log/mysql/mysql-slow.log max_heap_table_size=512M </code></pre> <p>The website is running on a core2duo with 2GB of RAM. I think that the problem may be caused by the sort_buffer_size but i'm not sure. thanks in advance.</p>
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    1. COCould also be your indexes, have you look into this aspect?
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    2. COThere's a number of inconsistencies in your question, please could you edit it to make it more clear?
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    3. COit must be fixed now, the names used in the table were turkish originally, seems like i forgot to translate some of them to english. sorry for my bad english by the way.
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