oracle OCP-053-656

656 The BACKUP_TAPE_IO_SLAVES parameter is set to FALSE for the database instance. Which statement is

true while performing a tape backup in an RMAN session?

A. The tape I/O performed is asynchronous

B. The tape buffer is allocated from the System GlobalArea (SGA)

C. The tape buffer is allocated from the Program Global Area (PGA)

D. Oracle I/O uses an interrupt mechanism to determine when each I/O completes

Answer: C
解析：RMAN  在SGA或PGA分配磁帶備份緩衝區，這取決於引數BACKUP_TAPE_IO_SLAVES的設定，當BACKUP_TAPE_IO_SLAVES = true時，從SGA或large pool（當你設定了LARGE_POOL_SIZE引數是時）分配磁帶緩衝區，當BACKUP_TAPE_IO_SLAVES = false時，從PGA分配緩衝區，