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分配磁带备份缓冲区，这取决于参数BACKUP_TAPE_IO_SLAVES的设置，当BACKUP_TAPE_IO_SLAVES = true时，从SGA或large pool（当你设置了LARGE_POOL_SIZE参数是时）分配磁带缓冲区，当BACKUP_TAPE_IO_SLAVES = false时，从PGA分配缓冲区，
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