Have you run an explain before each scenario to see if the access path is different?
-----Original Message----- From: Jeremy Zawodny To: Marc Cc: [EMAIL PROTECTED] Sent: 8/1/04 8:28 PM Subject: Re: better performance with optimize!?? (jboss) On Sun, Aug 01, 2004 at 01:42:24PM +0200, Marc wrote: > I use Mysql with JBOSS as applicationserver. > > i have strange response-time differences, which i can't explain. > > 1) after reboot the computer, it takes about 300ms to read 12 entities (cmp, > read ahead, 2 rows each entity) One entity is accessed by primary key, the > others by > foreign key. > > 2) when i reboot the computer and run mysql optimize first, it takes only > about 80ms to read the 12 entities!! Caching? In case #2, MySQL may have cached large amounts of the table during the OPTIMIZE. > 3) when i do the same with pure java / jdbc (outside jboss), it takes only > 30ms!!! it doesn't matter, if i run optimize or not! JBoss overhead? I dunno, I'm not a Java guy at all. Jeremy -- Jeremy D. Zawodny | Perl, Web, MySQL, Linux Magazine, Yahoo! <[EMAIL PROTECTED]> | http://jeremy.zawodny.com/ [book] High Performance MySQL -- http://highperformancemysql.com/ -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
