（696）Examine the following command for RMAN backup:

RMAN>RUN{

ALLOCATE CHANNEL c1 DEVICE TYPE sbt;

ALLOCATE CHANNEL c2 DEVICE TYPE sbt;

ALLOCATE CHANNEL c3 DEVICE TYPE sbt;

BACKUP INCREMENTAL LEVEL = 0

(DATAFILE 1, 4, 5 CHANNEL c1)

(DATAFILE 2, 3, 9 CHANNEL c2)

(DATAFILE 6, 7, 8 CHANNEL c3)

SQL 'ALTER SYSTEM ARCHIVE LOG CURRENT';

}

Which statement Is true regarding the approach in the command?

A. The RMAN multiplexing level is 4.

B. It is the use of asynchronous I/O by RMAN.

C. It is a case of parallelization of the backup set.

D. It is an implementation of a multisection backup.

答案：（C）

解析：

配了多个通道，就是为了并行的进行备份。

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Oracle 11G OCP 1Z0-053 696