Re: perforamance issue
- From: Mladen Gogala <mgogala@xxxxxxxxxxx>
- To: edwin_kodamala@xxxxxxxxx
- Date: Sun, 01 Oct 2006 22:41:55 -0400
On 10/01/2006 09:45:48 PM, edwin devadanam wrote:
> Hi gurus,
> we are having oracle applications instance(11.5.10.) running with 9.2.0.5
> database version.
> After applying oracle applications patch(not database patch),the whole system
> turned upside down.
> All the quieries are taking 20 times more time than before patching.
> we have done some workarounds but invain.
> please have a look at the active users sql run on the database before and
> after applying patch.
> active users before patching : time taken to complete 10sec (please see
> attachement)
> active users after patch : time taken to complete 180sec (please see
> attachment)
>
> Any help would be appreciated.
>
> Thanks,
> Edwin.K
>
Edwin, there are several things:
1) Do you have plans before the patch? What exactly does the patch do? What
problem
was the patch supposed to solve? What modules does it patch?
2) What kind of the statistics do you have? Did you gather system statistics,
aka "CPU costing"?
Do you have all relevant histograms?
3) Did you trace the sessions in question? 10046 and 10053? Are there any other
changes in
effect?
4) Did the patch installation re-compute your statistics? Are there any new
hints added to the
application processes?
5) What are the application waiting for? Sequential or scattered reads?
Enqueues?
6) Are performance problems centered around one group of applications? One
table, package or
trigger? Is there anything that the modules that users are complaining about
have in common?
Is every module using the same procedure, table or something like that?
7) Did you open a level 1 SR with Oracle Corp? Your situation sounds like
"business
critical system down" situation and Oracle is usually very good when that
happens.
It is extremely hard to give you a precise diagnosis based only on the several
execution
plans. The only person who can fix the things is you. This is why the job of
database administrator
is so stressful. Now everything depends on you, your knowledge and experience.
If things fail, you
will be blamed for everything and probably fired. I hope that I have lessened
the level of stress that
you feel right now.
--
Mladen Gogala
http://www.mladen-gogala.com
--
//www.freelists.org/webpage/oracle-l
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