单项选择题

FlashbackDatabaseisenabledinyourOracle10gdatabase.Oneofyourdatabaseuserserroneouslypurgedanimportanttableresidinginhisschema.Thetablewaspurgedsometimebetween10：00P.M.and10：30P.M.Thenextday，youdecidetoflashbackthedatabase.Beforeyouflashbackthedatabase，youwanttoensurethatyouhaveallthenecessaryflashbackdata.Whichdynamicperformanceviewmustyouusetodeterminewhetheryouhavetherequiredflashbackdatatorecoverthepurgedtable？（）
A.V$DATABASE
B.V$UNDOSTAT
C.V$FLASHBACK_DATABASE_LOG
D.V$FLASHBACK_DATABASE_STAT

A.Oneofyourdatabaseuserserroneouslypurgedanimportanttableresidinginhisschema.Thetablewaspurgedsometimebetween10：00P.M.and10：30P.M.Thenextday，youdecidetoflashbackthedatabase.Beforeyouflashbackthedatabase，youwanttoensurethatyouhaveallthenecessaryflashbackdata.Whichdynamicperformanceviewmustyouusetodeterminewhetheryouhavetherequiredflashbackdatatorecoverthepurgedtable？（）
A.V$DATABASE
B.V$UNDOSTAT
C.V$FLASHBACK_DATABASE_LOG
D.V$FLASHBACK_DATABASE_STAT

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Whichbackupoptiondefinesauser－definednameforabackup?（）

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InwhichscenariowillyouusetheFlashbackTransactionQueryfeature？（）

A.whenyouwanttorestoreanimportanttablethatisdroppedfromtheRecycleBin
B.whenyouwanttoobtaintheSQLstatementstoundothedeletionofsomeimportantrecordsfromatablebyatransaction
C.whenyouwanttorestoreadroppeduser’sschema
D.whenarowofatableisupdatedmanytimeswithinaspecifictimeperiodandyouwantalltheversionsoftherowinthespecifiedtimeperiod