Re: iostat and awr File IO Stats difference

From: Tanel Poder <tanel_at_tanelpoder.com>
Date: Wed, 3 Aug 2011 22:23:33 +0300
Message-ID: <CAMHX9JKW_YGBxWyQ95CChxEDvkYHQquWkv8unR0ZxSqKGk_52g_at_mail.gmail.com>

Also - the Oracle wait events really measure system call completion times (plus some overhead) which include scheduling latency, filesystem overhead (posix single-writer locking if cio is not used etc), LVM translation overhead etc ... iostat measures at very low level (entry point to device drivers) - Oracle measures multiple layers higher ... plus the scheduling latency ...

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Tanel Poder
http://blog.tanelpoder.com

On Wed, Aug 3, 2011 at 6:14 PM, K Gopalakrishnan <kaygopal_at_gmail.com> wrote:



> IO size between iostats and filestat.

>

> -Gopal

> --

> http://www.freelists.org/webpage/oracle-l

>

>

>


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http://www.freelists.org/webpage/oracle-l

Received on Wed Aug 03 2011 - 14:23:33 CDT