QUESTION 111
Which two statements are true about the duplexing of the backups taken by RMAN? (Choose two.)
A. It's only supported for the backups performed on the tape
B. It is not supported for backup operations that produce image copies
C. Duplex backups need a parallelism for the device to be equal to number of copies
D. Duplex backups can be performed to either disk ortape, but cannot be performed on tape and disk
simultaneously
Answer: BD
同160题：http://blog.csdn.net/rlhua/article/details/14441471
Explanation/Reference:
Section: Backup, Recovery & Recovery Manager
(RMAN)RMAN-03002: failure of backup command at 02/09/2011 15:37:15
RMAN-06580: the copies option cannot be used with AS COPY