What command is used to reset a database to a previous incarnation？（）  

单项选择题Howmanydatabaseinstancesareusedduringadatabase-duplicationprocess？（）

A. One
B. Two
C. Three
D. Four
E. Five

单项选择题Which of the following commands will perform an active database duplication of the ORCL database to the ORCL2 database？（）

A.A
B.B
C.C
D.D
E.E

单项选择题Whenyoureperformingactivedatabaseduplication，abackupofwhatkindisrequired？（）

A. A current RMAN backup-set backup is required.
B. No backup is required.
C. An RMAN image backup is required.
D. A manual backup is required.
E. A "duplicate" preparatory backup is required.

单项选择题Whichcommandisusedtobeginatablespacepoint-in-timerecovery？（）

A. Restore tablespace
B. Recover tablespace
C. Tablespace recover
D. Recover to time
E. recover datafile

单项选择题tablespacepoint-in-timerecoveryispossibleonlywithRMAN.（）

A. True
B. False