Hi, do you have perfstat or AWR available? If yes, create a report and look up how much gets/reads/db file * read your DB and statements do. So you can get an idea what really happens, and afterwards compare it with OS metrics. Regards Martin Klier Allen, Brandon schrieb: > I forgot to mention, I’m not talking about the db cache here – those > wouldn’t show up in the sar output at all, I’m talking about the > filesystem buffer cache of your OS (unless you’re using direct or raw IO). > > > > Regards, > > Brandon > > > > *From:* Bill Zakrzewski [mailto:bill@xxxxxxxxxxxx] > > > > very little chance all reads are satisfied by the database cache. > > > > > ------------------------------------------------------------------------ > Privileged/Confidential Information may be contained in this message or > attachments hereto. Please advise immediately if you or your employer do > not consent to Internet email for messages of this kind. Opinions, > conclusions and other information in this message that do not relate to > the official business of this company shall be understood as neither > given nor endorsed by it. -- Usn's IT Blog for Linux, Oracle, Asterisk http://www.usn-it.de -- //www.freelists.org/webpage/oracle-l