RMAN Configuration Question

I have just completed Oracle Education's "Enterprise DBA Part 1B: Backup and Recover" course.
Page 11-5 states : It is recommended that you have a separate catalog for each database.

My question is :
Why? Does this help you cleanup the RMAN catalog if you ever drop a database (you can drop the schema owner)? Is this how others have configured their RMAN database ?

Thus I am seeing 2 Configuration Models ; Have one schema owner per database that you are backing up. If you had two databases "PROD and DEV" then setup a RMAN-PROD and an RMAN-DEV schema owner (different RMAN Catalogs) in the same RMAN tablespace to manage each database's recovery info. VERSES
Have one schema owner (catalog) for all the databases that you are backing up.
If you had two databases "PROD and DEV" then setup one schema owner RMAN
(one RMAN Catalog) in the RMAN tablespace to manage all database recovery
info.

What are the pro's and con's?

Thanks in Advance

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Author: Pat Howe
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