（347）What does the output on this report indicate?

RMAN> report need backup; RMAN retention policy will be applied to the command RMAN retention policy is set to redundancy 1 Report of files with less than 1 redundant backups File    #bkps                Name    5            0                C:\ORACLE\ORADATA\ORCL\MY_DATA_01.DBF

A. The my_data_01.dbf datafile is corrupted and needs to be restored.

B. The my_data_01.dbf datafile has not yet been backed up. This report does not imply that the data in the datafile can not be recovered.

C. The my_data_01.dbf datafile has not yet been backed up. This report implies that the data in the datafile can not be recovered.

D. The my_data_01.dbf datafile no longer meets the retention criteria for backups.

E. Datafile 5 is missing.

答案：（B）

解析：

C（X），从结果来看，这个文件目前没有备份，但没用备份的文件，也可以使用redo日志来恢复。