Which two are true about the use of RMAN recovery catalogs when offloading backups to a physical standby
database?
A.
It backups that are offloaded to a physical standby database are taken when not connected to a recovery
catalog, then they may still be used for restoration on the primary database.
B.
The physical standby database may be used to register the database in the recovery catalog, if the primary
is not registered.
C.
The primary and physical standby databases must be registered separately in the recovery catalog, if a far
sync instance is used to route redo to the physical standby database.
D.
It is not necessary to use a recovery catalog unless a far sync instance is used to route redo to the physical
standby database.
E.
Primary and physical standby database may use different virtual recovery catalogs in the same physical
recovery catalog.
Explanation:
E: The RMAN recovery catalog is subdivided into multiple virtual recovery catalogs.
D: The following RMAN configurations are recommended at a standby database where backups are not done:
1. Connect RMAN to the standby database as target, and to the recovery catalog.
2. Enable automatic deletion of archived logs once they are applied at the standby database (this is also
applicable to all terminal databases when the cascading or far sync instance features are in use)
Incorrect Answers:
A: When using RMAN in an Oracle Data Guard environment, you should always connect it to a recovery
catalog.
B: You should not explicitly register the standby database in the recovery catalog.
https://docs.oracle.com/cd/E55822_01/AMAGD/amagd_concepts.htm#AMAGD562
Correct Ans: A, E
Far sync has nothing to do in the RMAN backup/restore.
A is correct because of this explanation from 12c DG manual:
If physical standby database backups are to be usable for restore jobs at the primary site, you must be connected to the recovery catalog when backing up the standby database OR ***you must resynchronize the physical standby database shortly after the backup***. This step is necessary because there is no way for the primary database to know about the standby backups unless the backup records are stored in the recovery catalog.
Read “A” carefully, ** they may still be used ***, so if you resync the physical standby right after the RMAN backup then you can still recover the primary using physical standby backups.
A,E