单项选择题

Whichofthefollowingcommandswillfail？（）

A.reportschema
B.reportneedbackup
C.reportneedbackupdays3
D.reportuser
E.reportobsolete

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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

单项选择题

Whichbackupoptiondefinesauser－definednameforabackup?（）

A.FORMAT
B.NAME
C.TAG
D.FORMATU%