What is the result of this command? RMAN> Report need backup days 3;
A. Lists all datafiles created in the last three days that are not backed up.
B. Lists all datafiles not recoverable based on the current retention criteria.
C. Lists all datafiles not backed up in the last three days. The datafile is not recoverable.
D. Lists all datafiles that need to be backed up due to unrecoverable operations.
E. Lists all datafiles not backed up in the last three days. It does not imply that the datafile is not
recoverable.
This command lists all database datafiles that would require that more than three days of archived redo logs be applied in order to be restored.
原文：http://www.cnblogs.com/Babylon/p/7815926.html