问答题

WhichtwostatementsregardingcompressedbackupsinRecoveryManager（RMAN）aretrue？（）

A.Backupcompressionisdisabledbydefault.
B.Backupcompressioncanbeusedwithbothbackupsetsandimagecopies.
C.BackupcompressioncannotbeenabledusingtheCONFIGUREcommand.
D.BackupcompressionworksonlyiftheCOMPATIBILITYparameterissetto9.0.0.0orhigher.
E.Backupcompressionappliestoonlybackupsets.
F.Backupcompressionappliestoonlyimagecopies.

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YourdatabaseoperatesinARCHIVELOGmodeandallthetablespacesareonline.Duetoausererror，youdecidedtoperformanincompleterecovery.Whichtwotaskswouldyouberequiredtoperformintherecoveryprocess？（）

A.openthedatabasewiththeRESTRICTEDoption
B.openthedatabasewiththeRESETLOGSoption
C.recovertotherequiredSCNonlythatdatafileinwhichtheerroroccurred
D.recoverallthedatafilestothesamesystemchangenumber（SCN）

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ourdatabaseisintheMOUNTstateandyouexecutethefollowingcommandtoopenit：ALTERDATABASEOPENWhattwoactionsareperformedasaresultofthiscommand？（）

A.Allcontrolfilesareopened.
B.Allredologfilesareopened
C.Thepasswordfileisopened.
D.Theparameterfileisopened.
E.Allonlinedatafilesareopened.