How can I upgrade 10G R1 to R2 ?

Hi,
We have Oracle 10G installed since last year. So far so good. But since Oracle had release latest one R2, can anyone tell me how to upgrade the existing 10G R1 ? There are a lot of data inside the server and many system had been deployed. So how can I ensure the upgrade will work 100% or another word, I am afraid if the upgrade failed, the system also failed. If the upgrade is straight foward without reconfigure or minimum changes, then I will try if the procedure is simple and easy.

Another thing is, we also have 2nd 10G installed to another machine. We plan to use this as a backup, just incase 1st server down, 2nd one will take over. But I believe it is not as siimple as it is. How can I do that ?

Thanks.
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KG1973Asked:
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actonwangCommented:


http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14238/toc.htm

notice if you have RAC set up, 10g introduces a "rolling upgrade" which doesn't incur any downtime while upgrading.

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Titan522Commented:
If you can't do RAC you can use Dataguard to ship the arch logs to the second server.
schwertnerCommented:
The best way is to use new installation or 10g R2 and to Export/Import the data.
This way is not simple because it needs investigations - non system users, tablespaces, etc.
but the DBA has full control over the process and also the original DB is not damaged (you can turn it off).
csachdevaCommented:
The following is a chain of events that I first thought might solve the upgrade with no downtime:

(These first steps *would* requires downtime for certain:)

1. shutdown Oracle 10g R1 on both nodes.
2. shutdown crs process.
3. upgrade CRS.
4. open the R1 databases using the R2 of crs.

------------------------------------------

the next steps I was unsure about, until I realized that what would happen in step 7:

5. shutdown Oracle 10g R1 on node A.
6. upgrade Oracle 10g to R2 on node A
7. open Oracle 10g R2 on node A <-- This step should not work because we are trying to join an Oracle 10g R2
database to a cluster with an already running an Oracle 10g R1 instance.
8. shutdown Oracle 10g R1 on node B
9. upgrade Oracle 10g to R2 on node B
10 open Oracle 10g R2 on node B

Done!

For more details, visit http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14238/upgrade.htm#i1011372

Regards,
Chetan Sachdeva
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