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Re: add node , oracle software a bit error

From: Alex Gorbachev <>
Date: Tue, 10 Jul 2007 17:39:33 -0400
Message-ID: <>

I will list some pros and cons - if anyone feels like adding some more - by all means, please do.

With shared Oracle home
- You are guaranteed to have the same patches on both nodes and use actually the same binaries.
- It's supposedly easier to manage (was a disaster in 9i though) especially on large RAC installations (by number of nodes).

I'm a bit skeptical as it requires some CFS or NFS to manage and it's yet another software stack if you are not using it as your primary database storage as well.

My arguments for non-shared homes:
- local filesystem is way simpler and rock solid. - if you screwed up something on one node - it is not propagated on another node (have you had someone wiping out the oracle homes completely? One SA sis that clean up for me once). - it's easier to apply rolling patches. Otherwise, for shared home it would require new home installation and re-register databases and instances. In the end, I'm actually not sure if that will be "online" in the end.

Just my two cents.


On 7/10/07, Dan Norris <> wrote:
> FWIW, I'm in the same boat--"it depends", but I have very rarely heard
> compelling arguments for using a shared OH. I just talked with another
> customer this morning that is very much looking forward to their 9i->10g RAC
> upgrade/migration so that they can eliminate the shared OH from their
> environment.
> Dan
> ----- Original Message ----
> From: Alex Gorbachev <>
> To:
> Cc:
> Sent: Tuesday, July 10, 2007 1:51:57 PM
> Subject: Re: add node , oracle software a bit error
> Well, there are two groups - some believe that shared oracle homes are
> better from manageability and reliability and others prefer non-shared
> installations.
> Both have their arguments and there is a third group that would say
> "it depends". I probably belong to the third group but lean more
> towards non-shared homes as a more reliable option.
> On 7/10/07, Randy Johnson <> wrote:
> > Good tip on the shared filesystem for the oraInventory. Sharing the
> > oraInventory across nodes is not a good practice in my opinion. It runs
> > counter to the whole concept of redundancy in an HA configuration and RAC
> > was not written to support it.

Alex Gorbachev, Oracle DBA Brewer, The Pythian Group
BAAG party -
Received on Tue Jul 10 2007 - 16:39:33 CDT

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