单项选择题 YouexecutedthefollowingcommandtoperformabackupoftheUSERStablespace：SQL>ALTERTABLESPACEusersBEGINBACKUP；ALTERTABLESPACEusersBEGINBACKUP*ERRORatline1：ORA-01123：cannotstartonlinebackup；mediarecoverynotenabledWhatcouldbethereasonforthiserror（）A.TheMTTRAdvisorisdisabled.B.ThedatabaseisinNOARCHIVELOGmode.C.Thetablespaceisalreadyinbackupmode.D.TheFlashRecoveryAreaisnotconfigured.

单项选择题 Given：12.Datedate=newDate（）；13.df.setLocale（Locale.ITALY）；14.Strings=df.format（date）；ThevariabledfisanobjectoftypeDateFormatthathasbeeninitializedinline11.WhatistheresultifthiscodeisrunonDecember14，2000？（）A.Thevalueofsis14-dic-2000.B.ThevalueofsisDec14，2000.C.Anexceptionisthrownatruntime.D.Compilationfailsbecauseofanerrorinline13.

单项选择题 Inyourdatabase，youmaybeforcedtoperformarecoveryusingtheRESETLOGSoptionduringwhichtheredologswouldberesettosequencenumber1.Youwanttoavoidtheoverwritingofoldlogfiles.Whicharchivedlogfilenameformatensuresthis？（）A.%t_%s.dbfB.arch_%t.arcC.arch_%d.arcD.arch_%t_%d.arcE.arch_%d_%s_.dbfF.arch_%t_%s_%r.arc