I just heard some fourth hand information that RMAN has been enhanced in a version post 8.0.6 that will allow for additional compression of the output file. I searched your archives, found a similar thread from last year. I, too, tried the compression via pipe inside RMAN, which, of course did not work.
Is there an enhancement to RMAN in a newer version of Oracle that would reduce the size of our db output file to smaller than the size of the actual data?
Thanks in advance,
RMAN does a compression in a way only non-empty data blocks are copied and the rest compressed (see backup recovery guide for better explanation). As an addition you can also use tape data compression facilities if any.
I am not aware of compression parameters for RMAN backups.
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