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？（）
单项选择题 Whichcommandisusedtobeginatablespacepoint-in-timerecovery？（）
单项选择题 tablespacepoint-in-timerecoveryispossibleonlywithRMAN.（）
