单项选择题
A. LIST command
B. CROSSCHECK command
C. REPORT command
D. SHOW command
单项选择题 YouhavenotconfiguredOracleManagedFiles（OMF）inyourdatabase.Youdonotwanttoscantheentiredatafileeverytimeanincrementalbackupisperformed.Youdecidetoenabletheblockchangetrackingfeature.Whichstatementwillyouusetoenabletheblockchangetrackingfeature？（）
单项选择题 YouaremaintainingyourdatabaseinOracle10g.YouareperformingthebackupbyusingtheBACKUPASBACKUPSETcommandattheRMANprompt.WhichfilecannotbebackedupbyusingtheBACKUPASBACKUPSETcommand？（）
多项选择题 Your database in running in the ARCHIVELOG mode. You issue the following command to back up datafile 2 in your database. RMAN> COPY DATAFILE 2 TO ’D：\ORACLE\ORA90\MYNEWDB\DA2.DBF’； Which two statements are true regarding the backup created using this command？（）