RMAN in data guard configuration works very normal like single standalone database. But, there are few important things you should know in order to define your backup and recovery strategy when using data guard. Full article link is here: https://www.support.dbagenesis.com/post/rman-in-dataguard-configuration

1. RMAN IN
DATAGUARD
CONFIGURATION

2. RMAN in data guard configuration works very normal like single
standalone database. But, there are few important things you should
know in order to define your backup and recovery strategy when using
data guard.
1.Need not register standby with catalog, RMAN will identify it as
standby
2.Catalog is must à This helps primary to be aware of standby backups
3.Backup controlfile on primary à On standby the controlfile is a
standby controlfile. In case of primary crash, you cannot use standby
controlfile. So, at least backup controlfile and spfile on primary.

3. 4.Set proper retention policy à This will not delete backups for the
specified recovery window
5.You can backup archive logs on both primary and standby. This
will provide you archive logs redundancy but not recommended

4. Register Primary Database
Let us register primary database with catalog

5. List db_unique_name on both primary and standby via below
command

6. Define connection string
for the primary and
standby
Resync catalog
See how LIST and REPORT
command can help you get
output from primary and
standby

7. While we configured physical standby, we had already
set archive deletion policy to not delete any archive until
they are applied on standby.
RMAN Assignment
Test Archivelog Deletion Policy

8. Stop MRP on standby
Generate more archives on primary, run below command few times

9. Now, try deletion archives via RMAN. Observer the error
message

10. Enable MRP on physical standby, run archive deletion again and
this time it should work fine

11. You can use standby database to restore lost data
files. Let us simulate an error with users tablespace.
Recovery Datafile From
Standby

12. Delete above datafile from asm file system as grid user

13. Restore the datafile from standby. The restored file will take a
different name

14. Get the new file name for the restored datafile and
recover it
Take the datafile online on primary

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