题目内容

在列管式换热器中，当热流体为饱和蒸汽时，流体的逆流平均温差和并流平均温差相等。

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YouworkasadatabaseadministratorforCertkiller.com.UsersintheCertkillerPRODdatabasecomplainabouttheslowresponsewhenaccessingthedatabase.IntheActiveSessionWaiting：Configurationpageyoufindthatthemajorityofthewaittimeisfortheredologbuffer.FurtherinvestigationusingtheRunQueuegraphandoperatingsystemtoolsrevealsthattheredologfilesareonthesamedisks，andthatthediskI/Ofortheredologfilesisthereasonfortheperformancedegradation.
Whichtwoactionswouldyoutaketogainperformance？（）

Yousettherecoverywindowtosevendays

YourdatabaseoperatesinARCHIVELOGmode.Theredologfilesarenotmultiplexedandoneoftheonlineredologsismissing.Themissingredologsequence，230，isnotarchivedanditcontainedinformationfrom10：35a.m.onwards.Thecurrenttimeis11：00a.m.Becauseofadiskcrash，youexecutedthefollowingcommandtoperformanincompleterecovery：
RMAN＞RUN{
2＞SETUNTILSEQUENCE230THREAD1；
3＞ALTERDATABASEMOUNT；
4＞RESTOREDATABASE；
5＞RECOVERDATABASE；
6＞ALTERDATABASEOPENRESETLOGS；
7＞}；
Withreferencetothisscenario，whichstatementistrue？（）

ThedatabaseinstanceiscurrentlyusingSPFILE.ViewtheExhibitandexaminetheerrorthatyoureceivedwhilerunningtheDBStructureIntegritycheck.
Givenbelowarethestepstorecoverfromtheerrorinrandomorder:
1:Shutdowntheinstance,ifnotalreadydone.
2:Copyoneoftheremainingcontrolfilestoanewlocation.
3:ChangethevalueoftheCONTROL_FILESinitializationparametertocorrespondtothenewlocationofthecontrolfiles.
4:StartupthedatabaseinstancetotheNOMOUNTstage.
5:Recoverthedatabasetothepointoffailureofthecontrolfile.
6:Openthedatabase.
Identifythecorrectsequenceofsteps()