Re: Awr waits over 100%

From: Wolfgang Breitling <breitliw_at_centrexcc.com>
Date: Wed, 28 Sep 2011 16:26:11 -0600
Message-Id: <E5617C33-0BD8-46BD-9AFF-4AE636FC7B9F_at_centrexcc.com>

To add a bit more, on a busy system it is even possible that productive work ( CPU time ) "appears" to be > 100% according to AWR.

Regards
Wolfgang Breitling
Centrex Consulting Corporation
http://www.centrexcc.com

On 2011-09-28, at 12:19 PM, Wolfgang Breitling wrote:

> I'd consider that "normal"
> While a system has only a limited ( to the number of cpus/cores ) capacity for productive work, any system has an unlimited capacity to wait.
> E.g. if one session holds a lock for 1 hour and 2 sessions wait for that lock fthen you may have up to 100% ( 1 hour in 1 hour ) cpu usage from that one session and 200% ( 2 hours in 1 hour ) waits from the other 2 sessions.
> Regards
> Wolfgang Breitling
> Centrex Consulting Corporation
> http://www.centrexcc.com
>
> On 2011-09-28, at 8:55 AM, Kenneth Naim wrote:
>

>> I pulled an awr this morning for a period and the top wait events add up to
>> almost 200%. I was curious if anyone saw this before. I've seen it slightly
>> over 100% that I wrote off for rounding but never saw it so high. I'm
>> addressing the actual wait events so no issues there.
>> 

>
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Received on Wed Sep 28 2011 - 17:26:11 CDT