问答题

YouarecreatingaformthatwillaccessanOracle8database.Onwhichthreesourcescanyoubaseadatablock?（）

A.BFILE
B.REFcolumn
C.Objecttable
D.Columnobject
E.INSTEAD-OFtrigger

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WhichtwostatementsregardingtheFLASHBACK_TRANSACTION_QUERYviewarecorrect?（）

A.Youcanfindinformationaboutonlyactivetransactionsfromtheview
B.Youcanfindinformationaboutreadonlytransactionsfromtheview
C.YourequiretheSELECTANYTRANSACTIONsystemprivilegetoaccesstheview
D.Youcanfindinformationaboutbothactiveandcommittedtransactionsfromtheview
E.YourequiretheSELECTONFLASHBACK_TRANSACTION_QUERYobjectprivilegetoaccesstheview

Whichtwoarecharacteristicsofuser－managedbackupandrecoveryoperations？（）

A.RecoveryisinitiatedusingSQL*Plus.
B.DatabasefilesarebackedupusingSQLcommands.
C.DatabasefilesarebackedupwithRecoveryManager.
D.DatabasefilesarerestoredusingRecoveryManager.
E.Databasefilesarebackedupusingoperatingsystemcommands.