Multiple Oracle_home (best way to upgrade) ??

hello all,
I was going thru the below link and found this very cool trick that i didnt know.
http://searchoracle.techtarget.com/tip/0,289483,sid41_gci1252556,00.html?track=NL-93&ad=587723&asrc=EM_NLT_1354356
it goes something like this
*My favorite best practice is the one about multiple Oracle Homes. Here it how it goes. When applying a patch or a patchset, I recommend against applying to the existing Oracle Home. Instead, I suggest creating a new Oracle Home, and apply the patches there.
I create the first Oracle Home at /app/oracle/db_1, for instance. When a patch comes out, I install the whole Oracle software in a different home -- /app/oracle/db_2 -- and then apply the patch there. During the process of installation and patch application, the database is up and running, as it runs off the home /db_1. When the outage window comes, all I have to do is to shut down Oracle; change Oracle Home to db_2 and bring the database up. If there is a problem, I can reset the Oracle Home back to the old one.
So, here is the conventional approach:
1. Shut down the database
2. Apply patch to the Oracle Home
3. Start the database
4. In case of problems:
5. Shut down the database
6. Roll back the patch
7. Start the database
Steps 2 and 6 could take as much as three hours depending on the amount of patching. The database is down during these times.
In the new approach:
1. Install new Oracle Home
2. Apply the patch to the new Home
3. Shut down the database
4. Change Oracle Home to the new location
5. Start the database
6. In case of problems:
7. Shut down the database
8. Change Oracle Home to the old one
9. Start the database
The database is down only during steps 4 and 8, which takes a couple of minutes at the most, not hours.*
But my question comes here...first of all is it possible ?? i am sure it is becoz Arup Nanda one of the know oracle guys wrote this article. so here are my Q?
1- So if i get this right...if i want to upgrade to 11g...and my database is on 10g...all i need to do this create a new 11g home...shutdown my 10g database...set my oracle_home to 11g and start my database up...and its all upgraded ????
2- Another thing that worries me is how this might behave in RAC environment. Any idea
on that? i know RAC provides the rollover upgrade so we might
not need this. but would be cool to know how it behaves...ANY IDEAS ?
3- Also, I wonder how CRS and ASM home like this idea ??

Basically when you switch from the old home to the new Oracle home you are following manual database upgrade procedures so you would need to run whatever scripts are contained in the instructions. Normally for an upgrade that is catalog and catproc and you would run these immediately after bringing the database up on the new home. For a patch there might be an upgrade script or no database level scripts may be necessary. That is the patch may effect only the binary.
What we actually do is in test install new copy of existing Oracle then patch/upgrade to current level. Next build an empty database and populate it. Next test. When OK shut it down and apply patch. Startup and follow Readme or Upgrade manual procedures. If test works fine and the upgrades tests OK then we remove the new test db, switch the actual in-use test databases over to the new patched home, run upgrade scripts as necessary, and continue.
After a few weeks we start getting maintenance windows to do production. Since we have multiple databases we usually do not do all of them at once.
HTH -- Mark D Powell --

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