You are tuning RMAN to optimize performance. You want tape I/O to be asynchronous when you perform tape backups.
Which action should you take?
A.
Set the BACKUP_TAPE_IO_SLAVES parameter to FALSE.
B.
Set the BACKUP_TAPE_IO_SLAVES parameter to TRUE.
C.
Use compression when performing tape backups.
D.
Configure multiple SBT channels.
Explanation:
You should set the BACKUP_TAPE_IO_SLAVES parameter to TRUE. When this parameter is set to TRUE, RMAN uses I/O server processes to perform reads and writes when performing backups, copies, or restores to or from tape. When asynchronous tape I/O is configured, tape buffers are allocated from the SGA, rather than the PGA. With asynchronous I/O, the server process can perform multiple I/O operations at the same time. For example, it can begin a read/write operation and perform other tasks while waiting for the current I/O operation to finish. You should note that the support for asynchronous I/O is dependent on the operating system. Not all operating systems support asynchronous tape I/O.
You should not set the BACKUP_TAPE_IO_SLAVES parameter to FALSE. This would configure RMAN to use synchronous tape I/O, which is the default value. With synchronous tape I/O, a server process can perform only one operation at a time, and tape buffers are allocated from the PGA.
All of the other options are incorrect. Using compression or multiple channels does not configure RMAN to use asynchronous tape I/O.