It is actually up to you, I see no reason not to use a catalog even alternative ways to restore your database do exist.
Let me ask you a question, why not to use it? What are you trying to save?
Correction: Ebrian's remark is the most remarkable I mean
Hi,
The fact that you have to create another database for the catalog is cumbersome plus u have to protect the 2nd maybe by another rman catalog like a chain reaction?
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