单项选择题

Whatisthepurposeofthecatalogcommand？（）

A.ToreviewRMANcontrolfileandrecoverycatalogmetadataandensurethatitscorrect
B.TodeleteRMANbackup-relatedmetadatafromtherecoverycatalog
C.Tocreatemetadatainthecontrolfileandtherecoverycatalogrelatedtobackupsetpieces
D.Tocreateareportthatlistsdatabasebackups
E.Torebuildtherecoverycatalog
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单项选择题
WhichisthecorrectdescriptionofthesignificanceoftheORACLE_HOMEenvironmentalvariable？（）
A.ItspecifiesthedirectorycontainingtheOraclesoftware.
B.ItspecifiesthedirectorycontainingtheOracle-ManagedFiles.
C.Itspecifiesthedirectoryfordatabasefiles，ifnotspecifiedexplicitly.
D.ItspecifiesthebasedirectoryofOptimalFlexibleArchitecture（OFA）.
单项选择题
YourdatabaseisinARCHIVELOGmode.OnFridayevening，youperformanonlinedatabasebackupbyusingtheBACKUPDATABASEcommandattheRecoveryManager（RMAN）promptandclosethedatabase.OnMonday，theSystemAdministratorinformsyouaboutthefailureoftwoharddisks.Oneofthelostdiskscontainstwodatafiles，HR1.DBFandHR2.DBF，bothofwhichbelongtoaread writetablespacenamedHR.Thediskalsocontainsadatafile，USERS.DBF，whichbelongstoaread writetablespacenamedUSERS.YouneedtorestoreandrecoverthedatabasebackupthatwasperformedonFridayevening.Aftermountingthedatabase，youissuethefollowingRMANcommands：RMAN>RESTOREDATABASE；RMAN>RECOVERDATABASE；AftersuccessfullyexecutingtheseRMANcommands，youissuethefollowingstatementusingSQL*Plus：SQL>ALTERDATABASEOPEN；Youreceivethefollowingerrorswhenattemptingtoopenthedatabase：ORA-01157：cannotidentify lockdatafile10seeDBWRtracefileORA-01110：datafile10：’D： USERS.DBF’Whatisthecauseoftheseerrors？（）
A.OnFridayevening，youperformanonlinedatabasebackupbyusingtheBACKUPDATABASEcommandattheRecoveryManager（RMAN）promptandclosethe
B.OnMonday，theSystemAdministratorinformsyouaboutthefailureoftwoharddisks.Oneofthelostdiskscontainstwodatafiles，HR1.DBFandHR2.DBF，bothofwhichbelongtoaread/writetablespacenamedHR.Thediskalsocontainsadatafile，USERS.DBF，whichbelongstoaread/writetablespacenamedUSERS.YouneedtorestoreandrecoverthedatabasebackupthatwasperformedonFridayevening.Aftermountingthedatabase，youissuethefollowingRMANcommands：
C.DBF’
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