mysql innodb:innodb_flush_method

Posted by Daniel on Stack Overflow See other posts from Stack Overflow or by Daniel
Published on 2010-05-04T03:47:33Z Indexed on 2010/05/04 3:58 UTC
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mysql

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innodb

in the following link

http://dev.mysql.com/doc/refman/5.1/en/innodb-parameters.html#sysvar_innodb_flush_method

it says:Different values of this variable can have a marked effect on InnoDB performance. For example, on some systems where InnoDB data and log files are located on a SAN, it has been found that setting innodb_flush_method to O_DIRECT can degrade performance of simple SELECT statements by a factor of three.

Why O_DIRECT could slow down the select statement?

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