You may or may not want the "ALL" in the "DELETE ALL INPUT" referenced 
below.

Let's say you have 2 copies of each archive redolog.  RMAN reads and 
backs up from one of the two copies.  Without "ALL", RMAN deletes only 
the archive redolog copy read; with "ALL", RMAN deletes both copies.

Some reasons for each:

* With "ALL" backup volume is reduced and space to hold the archive 
redologs in the DB is minimized.

* Without "ALL", 1 copy of backed up archive redologs are left on disk, 
presumably to be backed up and erased on the next backup job.  This 
leaves 1 copy on the DB, should it be needed, and maintains 2 copies of 
these vital files within the backup system.   I'd like to be able to 
guarantee that my two copies get written to different tapes, but I don't 
know how. :-(

Hope this helps!

cheers, wayne

Robin Small wrote, in part,  on 11/15/2006 2:02 PM:
> The important bit in your RMAN script is in the archive log portion 
> tohave the "DELETE INPUT" part added to your ARCHIVELOG ALL line 
> inbacking up your archive logs on a FULL.