… about O_DIRECT of InnoDB…. http://dev.mysql.com/doc/refman/5.0/en/innodb-parameters.html#sysvar_innodb_flush_method What you say is feature for PostgreSQL only…. Do you prefer PostgreSQL to MySQL??? (PostgreSQL is one… of performance for me. I think you should not tune MySQL/InnoDB based on the PostgreSQL tuning knowledge…) Thank you