Oracle OCP 1Z0 053 Q347( report need backup)

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.
Answer: B

沒有備份，但是可以用redo來恢復

參考：http://blog.csdn.net/rlhua/article/details/14519143

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