A.IGNORE=Y
B.DIRECT=Y
C.CONSISTENT=Y
D.BUFFER=Y

A.EXECUTE_CATALOG_ROLE
B.CONNECT
C.RESOURCE
D.RECOVERY_CATALOG_OWNER
E.RECOVERY_CATALOG_USER

A.Data files
B.Control files
C.Archived log files
D.Files storing RMAN scripts

A.OPEN
B.MOUNT
C.NOMOUNT
D.CLOSE

A.YYYY-DD-MM:HH24:SS:MI 
B.YYYY-DD-MM:HH24:SS:MM 
C.YYYY-MM-DD:HH24:MI:SS 
D.YYYY-DD-MM:SS:MI:HH24

A.It improves usability by enabling you to reuse the scripts to perform recovery operations.
B.It detects block corruption while restoration and recovery operations.
C.It enables you to perform block media recovery.
D.It is capable to recover through unrecoverable operations， with only full database backups.

A.SET AUTORECOVERY ON
B.SET RECOVERY ON
C.SET AUTO ON
D.You cannot enable automatic media recovery.

A.NORMAL
B.TRANSACTIONAL
C.ABORT
D.IMMEDIATE
E.INCONSISTENT

A.RESTORE
B.RECOVER
C.REPORT
D.BACKUP

A.1
B.5
C.10
D.15
E.Depends on system memory resources

A.CKPT
B.SMON
C.LGWR
D.DBWn
E.ARCn