多项选择题
Which operation requires that you create an auxiliary instance manually before executing the operation？（）
A. Backup-based database duplication. B. Active database duplication. C. Tablespace point-in-time recovery. D. No operation requires the creation of an auxiliary instance.
多项选择题 Whenyoureperformingatablespacepoint-in-timerecovery，whichtablespaceswillalwaysberestoredtotheauxiliaryinstance？（）
多项选择题 Whatarethetwodifferenttypesofdatabaseduplication？（）
单项选择题 Whichofthefollowingcommandswillfail？（）
