Oracle Dataguard 11gR2 -- 10gR2 compatibility

Hi,
The short question is: with physical standby, is Dataguard compatible with different source/destination database releases?
I am planning to perform an upgrade from Oracle 10gR2 to 11gR2. I have a Production 2 node RAC and a geographically seperate physical standby DR site 2 node RAC using Dataguard.
Naturally (I think) I would upgrade Production first and then DR later. During the time when my Production is on 11gR2 and my DR is on 10gR2, can I still maintain a physical standby with Dataguard? My gut tells me that is not possible since the data dictionary is going to be completely differently between the 2 releases. I would need at least 1 week before I am able to perform the upgrade on the DR side, and have no possibility of getting more disk space for a temporary logical standby.
Conversely if it is backward compatible, can I perform the upgrade on the DR site first then use Dataguard to keep the DBs in sync until the next weekend where I upgrade the Production?
Any other options I can exercise with the boundaries that I have? (No additional disk space can be allocated)
Thanks in advance.

hi,
you cannot have different version at primary and DR sites..
There is procedure for this.. Please read oracle documentation for step by step procedure:
http://download.oracle.com/docs/cd/B28359_01/server.111/b28294/upgrades.htm
Please follow steps from above documentation:
Perform the following steps to upgrade to Oracle Database 11g Release 1 (11.1) when a physical standby database is present in the configuration:
1. Review and perform the steps listed in the "Preparing to Upgrade" chapter of the Oracle Database Upgrade Guide.
2. Shut down the primary database.
3. Shut down the physical standby database.
4. Install the new release of the Oracle software into a new Oracle home on the physical standby database system, as described in the Oracle Database Upgrade Guide.
5. Mount the physical standby database.
Note: The standby database should not be opened until the primary database upgrade is completed.
6. Start Redo Apply on the physical standby database.
7. Install the new release of the Oracle software into a new Oracle home on the primary database system as described in the Oracle Database Upgrade Guide.
8. Upgrade the primary database as described in the Oracle Database Upgrade Guide. Note that the physical standby database will be upgraded when it applies the redo generated by the primary database as it is upgraded.
9. Open the upgraded primary database.
10. If Active Data Guard was being used prior to the upgrade, then refer to Section 9.2.1 for information about how to reenable it after upgrading.
Regards
Rajesh

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