I think AE:
B;C is false
D: should be used in parallel...i can compress or Backup with
RMAN> configure device type sbt backup type to compressed backupset;
or via media manager sw for only sbt compression or together......NOT should be used in parallel
A. SBT tape compression can be used even if no RMAN compression is configured.
B. Any backup set written to the SBT device in this configuration can contain a maximum of two backup pieces.
C. Any backup written to the SBT device in this configuration can contain a maximum of two backup sets.
D. SBT tape compression and RMAN backup compression should be used in parallel.
E. The SBT device should be configured to use PARALLELISM 2 to allow both tape drive to be used simultaneously.
-- I think it is AE,
A - sbt tape compression independently can be used on the TAPE side. Oracle recommends You should not use both tape compression provided by the media manager _and_ binary compression provided by RMAN. If the media manager compression is efficient, then it is usually the better choice. Using RMAN-compressed backup sets can be an effective alternative to reduce bandwidth used to move uncompressed backup sets over a network to the media manager, if the CPU overhead required to compress the data in RMAN is acceptable.
For backup set and backup pieces:
A backup set contains one or more binary files in an RMAN-specific format. Each of these files is known as a backup piece. A backup set can contain multiple datafiles. For example, you can back up 10 datafiles into a single backup set consisting of a single backup piece. In this case, RMAN creates one backup piece as output. The backup set contains only this backup piece.
https://docs.oracle.com/cd/E18283_01/backup.112/e10642/rcmcncpt.htm#sect2
I think not D - "You should not use both tape compression provided by the media manager and binary compression provided by RMAN. If the media manager compression is efficient, then it is usually the better choice"
https://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmtunin.htm#BRADV90075
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