（204）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.

答案：（B）

解析：

BACKUP_TAPE_IO_SLAVES = {true | false}

确定是RMAN否使用I/O server processes(slaves进程)来备份、拷贝、restore数据到磁带.

true, 使用slave进程从磁带设备来读写

false,不使用slaves进行备份,会使用shadow process来访问磁带设备