Re: multiple databases in a single RAC cluster

  • From: Bob <orcl@xxxxxxxxxxx>
  • Date: Tue, 11 Nov 2008 23:39:07 -0500

Thanks Matt, wondering if there are any specific white papers ( I couldn't find any)

Im thinking this would be a very complex configuration  ie

asm disk separation - per database -

data guard DR for multiple databases....

the interconnect would really take a beating...probably needing nics for each database...

I mean that sounds like  a "very" complex.

The client here is looking to save allot of money by consolidating environments of 15 databases on single servers with active passive veritas clusters - moving them to rac

The strategy is to save money (hardware and support) - I'm just not feeling it...

Im looking for some white papers for this type of configuration, and feedback for costs.

To me rac is excellent for a single database with the need for extremely high level of connections (amazon type, banking, financial), and high availability, but mixing many disparate (1-4 single application) databses into a cluster to save money just dosnt make sense.


Matthew Zito wrote:
Yes, absolutely, we have one customer who has an 8 node RAC cluster that's 
running 12 databases, each with between 2 and 8 instances, and a pile of other 
customers with 2-4 node clusters with multiple databases.  I'm sure there's 
some internal limitations as to the number of services that can be registered 
in the CRS, but I doubt many people run into it.

Matthew Zito
Chief Scientist
GridApp Systems
P: 646-452-4090

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx on behalf of Bob
Sent: Tue 11/11/2008 9:12 PM
To: oracle-l
Subject: multiple databases in a single RAC cluster
Hi, As much as Ive been browsing / studying rac... Im looking for a definitive answers about how many "databases" can be on one rac cluster.

Say I want to have 4 independent databases on one cluster, is that possible? I understand one can easily have multiple instances pointing to a single database (sga, control_file, db_name, spfile, archive_dest, etc) but what about several independent databses?

Any documents referencing this?

I found this on ask tom... just wanted to confirm with this group, probably in a more concise manner.

So, How many databases (sga, control_file, db_name, spfile, archive_dest, etc) can be in a single rac cluster?




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