RE: RAC environment patching and availability

I have a question. Supposed if I want to apply an Application patch and keep the database available to the users during that time for concurrent updates, what will the process be? Remember the Application patch also apply updates to the database as well.

Thanks.

Date: Mon, 10 Sep 2007 11:05:26 -0700
From: kaygopal_at_yahoo.com
Subject: Re: RAC environment patching and availability To: kaygopal_at_yahoo.com; litanli_at_gmail.com CC: oracle-l_at_freelists.org

Li Li, In current versions, JUST RAC alone can not provide the 24x7 availability. You need to have the combination of RAC+Dataguard (logical) to have REAL 24x7 availability. Also not all patches/upgrades are 'rolling upgrade' capable. Have a look at this presentation to undertand the issues in rolling upgrade. http://www.oracle.com/technology/deploy/availability/pdf/oow06/S281209_To.pdf -Gopal On 9/10/07, Li Li <litanli@gmail.com> wrote:
> Hi, All,
>
> I recently patched our 2-node RAC (10.2.0.2 on RHEL AS 4 update 4) to
> 10.2.0.3. I got the impression that you can do rolling upgrade in a RAC
> environment, until I dig into the patch installation document and found out
> that you can do rolling upgrade on the clusterware part but not on the RAC
> database part. Fortunately we can afford the service to be down for a couple
> of hours.
>
> My question is: is there a way to keep your RAC database up while you patch
> it? RAC itself doesn't really provide 24x7 High Availability? Any comments?
>
> Thanks,
> -Li

-- 
Best Regards,
K Gopalakrishnan 
Co-Author: Oracle Wait Interface, Oracle Press 2004
http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/
Author: Oracle Database 10g RAC Handbook, Oracle Press 2006
http://www.amazon.com/gp/product/007146509X/




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