多项选择题
A. To recover a dropped table.
B. To recover a dropped schema.
C. To recover data from a truncated table.
D. To view changes made by all the transactions during a given period of time.
E. To view changes made by a single transaction during a given period of time.
多项选择题 InRecoveryManager（RMAN），youhavesetcontrolfileautobackuptoONbyusingthefollowingcommand：CONFIGURECONTROLFILEAUTOBACKUPON；Whichtwoeventswouldcausethecontrolfiletobebackedupautomatically？（）
单项选择题 YouexecutethefollowingRMANcommandintheordershownbelow：BACKUPVALIDATEDATABASE；BLOCKRECOVERCORRUPTIONLIST；Whatwillthesecommandsdo？（）
单项选择题 Whatpurposewouldyouachievebyenablingtheblockchangetrackingfeature？（）