Re: Performance metrics

  • From: Karl Arao <karlarao@xxxxxxxxx>
  • To: kevin.jernigan@xxxxxxxxxx
  • Date: Thu, 12 Apr 2012 12:53:11 -0500

Yeap, this one
PGA reaching 30GB when developers fire up new reports that's doing
tremendous hash joins eating up the server memory causing the kswapd to
kick in and swapping at a high rate which translates to CPU wait IO and
high load average.. basically killing the server
https://lh4.googleusercontent.com/-AB22fuuzLwE/T4b53Ris6QI/AAAAAAAABio/mu_dIx3A3uE/s2048/20120412-template-PGA.png


already has instance caging.. but since you are hitting tremendous amount
of CPU (wait IO) caused by kswapd that is outside of the Oracle Kernel..
then the instance caging will not be able to control that.



On Thu, Apr 12, 2012 at 12:06 PM, kevin jernigan
<kevin.jernigan@xxxxxxxxxx>wrote:

> You could also use Resource Manager to limit the amount of CPU available
> to low priority consumer groups, and also to control or kill runaway
> queries:
>
> http://docs.oracle.com/cd/**E11882_01/server.112/e16638/**
> os.htm#PFGRF95151<http://docs.oracle.com/cd/E11882_01/server.112/e16638/os.htm#PFGRF95151>
>
>

-- 
Karl Arao
karlarao.wordpress.com
karlarao.tiddlyspot.com


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