Examine this syntax which allocates channels during a parallel image copy： RMAN> CONFIGURE DEVICE TYPE disk parallelism 4： 2> COPY 3> datafile 1 TO ‘/BACKUP/datafile1.dbf’， 4> datafile 2 TO ‘/BACKUP/datafile2.dbf’， 5> datafile 3 TO ‘/BACKUP/datafile3.dbf； RMAN>COPY 2> datafile 4 TO ‘/BACKUP/datafile4.dbf’； How many channels are used？（）A.0B.1C.3D.4

单项选择题

Examine this syntax which allocates channels during a parallel image copy：
RMAN> CONFIGURE DEVICE TYPE disk parallelism 4：
2> COPY
3> datafile 1 TO ‘/BACKUP/datafile1.dbf’，
4> datafile 2 TO ‘/BACKUP/datafile2.dbf’，
5> datafile 3 TO ‘/BACKUP/datafile3.dbf；
RMAN>COPY
2> datafile 4 TO ‘/BACKUP/datafile4.dbf’；
How many channels are used？（）

A.0
B.1
C.3
D.4

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