单选题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； RMANCOPY 2 datafile 4 TO ‘/BACKUP/datafile4.dbf’； How many channels are used？（）A0B1C3D4
单选题
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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解析：
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