Best Practices in DB Consolidation using RAC

Dear all
I'm looking for recommendations on DB Consolidation using RAC.
I mean:
Assuming to have different serious production databases which availability is a serious requirement.
Which is best: to have different small RACs with one DB on each, or having a big RAC and put all the DB's into it.
- What is recommended
- What are limitations & issues
e.g:
- Supported DB version (assume we can force developers to support a certain version)
- Different Startup options (I heard this one for conslidation in an stand alone DB Server with multiple instances. Is it an issue for RAC architecture?)
- What are challenges and how to overcome
- When to have One RAC with multiple instances & when to have multiple RAC with one instance per RAC
- What DB's are better to be consolidated in one RAC, and when it is best to seperate them
And many other considerations that surely have'nt gone through my head :)
I need a comprehensive view and need some references.
looking forward to your kind replies
cheers
Mehdi Sarmadi

Hi Mehdi,
Which is best: to have different small RACs with one DB on each, or having a big RAC and put all the DB's into it.
It will be better to have DB for OLTP type application seperate than the DB for DSS type appllication.This way you'll have more control over their performance.
What is recommended
- What are limitations & issues
e.g:
- Supported DB version (assume we can force developers to support a certain version)
- Different Startup options (I heard this one for conslidation in an stand alone DB Server with multiple instances. Is it an issue for RAC architecture?)
As far as DB version is concerned 11gR1 is the latest version and is stable also. So it is always advisable to go with the latest stable version.This will make your support from Oracle last longer.
I didn't understand what u exactly meant by different startup options.But the startup options will remain same for RAC DB also as far as DB is cocerned.Only the additional task will be the Cluserware components startup and ASM instance (if used).
- What are challenges and how to overcome
- When to have One RAC with multiple instances & when to have multiple RAC with one instance per RAC
- What DB's are better to be consolidated in one RAC, and when it is best to seperate them
There are not any chalenges to overcome in RAC other than the pre-requistes required by it . For the requirements go through oracle docs.
Having one node RAC doesn't make much sense other than when u have only one server and u plan to add other ones later on.You'll be able to use RAC benefits with multiple instance only.How many instances u need is a matter of observation of the type of load your aplication will have.
For installtion docs of RAC go u can view the link below and choose appropriate option according to your OS:
[http://www.oracle.com/pls/db102/portal.portal_db?selected=11]
Gud Luck!
Vijay Shanker
Edited by: Vijay Shanker on Feb 15, 2009 9:36 PM
Edited by: Vijay Shanker on Feb 15, 2009 9:42 PM

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