您的数据库正在ARCHIVELOG模式下运行。您使用RMAN生成映像副本，并每六个小时增量更新这些副本一次。在常规维护任务后，当您尝试重新启动实例时，它在MOUNT状态下中止，并显示错误，指出属于EXAMPLE表空间的一个数据文件丢失。您希望尽快恢复数据文件，同时最大化数据库的可用性。查看恢复过程中可能涉及的步骤:1.装载数据库。2.使数据文件脱机。3.使表空间联机。4使用RMANSWITCH命令

A．6、4、3、5

B．6、3、4、5

C．1、3、4、5

D．2、3、4、5

A.RMANkeepsalistofarchivelogsinatextfile.

B.TheDBAmustmanuallytellRMANwhicharchivelogstobackup.

C.RMANhasaccesstotargetcontrolfileand/orcataloginformation.

D.RMANlooksattheARCHIVE_LOG_DESTparameterofyourtargetdatabaseandbacksupallarchivelogsfound.

A．ORACLE要将填满的在线日志文件组归档时，则要建立归档日志

B．在操作系统或磁盘故障中可保证全部提交的事务可被恢复

C．数据库可运行在两种不同方式下：非归档模式和归档模式

D．数据库在ARCHIVELOG方式下使用时，不能进行在线日志的归档

YourARCHIVELOG-modedatabasehaslostthreedatafilesandshutdown.OneisassignedtotheSYSTEMtablespaceandtwoareassignedtotheUSERStablespace.Youcanchoosefromthefollowingstepstorecoveryourdatabase：

a.Restorethethreedatabasedatafilesthatwerelost.

b.IssuetheStartupMountcommandtomountthedatabase.

c.Issuethealterdatabaseopencommand.

d.Issuethealterdatabaseopenresetlogscommand.

e.Recoverthedatabaseusingtherecoverdatabasecommand.

f.Recoverthedatafileswiththerecoverdatafilecommand.

g.Takethedatafilesoffline.

Whichisthecorrectorderofthesestepsinthiscase？（）

A. PARALLEL Mode

B. ARCHIVELOG Mode

C. NOARCHIVELOG Mode

D. RAC Mode

YourdatabaseisrunninginNOARCHIVELOGmode.EverynightthereisabackuptakenusingRMAN.DuringyourstartupthismorningyoureceivedenerrorregardingDISK3onyourserver.ThisisthelocationofyourdatafilefortheSYSTEMtablespace.Whichoptionisopentoyou？（）

A.A

B.B

C.C

D.D

YouissuethisRMANcommand：RMAN>createscriptLevel0Backup{backupincrementallevel0format‘/u01/db01/backup/%d_%_Sp’fileperset5（databaseincludecurrentcontrolfile）；sql‘alterdatabasearchivelogcurrent’；}WhichthreestatementsaretrueabouttheLevel0Backupscriptyoujustcreated？（）

A.Thescriptisstoredonlyinthecontrolfile.

B.Thescriptisstoredonlyintherecovercatalog.

C.ThescriptcanbeexecutedonlybyusingtheRMANRUNcommand.

D.ThecommandsofthescriptcanbedisplayedwiththeLISTcommand.

E.ThecommandsofthescriptcanbedisplayedwiththePRINTcommand.

F.ThecommandsofthescriptcanbedisplayedwiththeREPORTcommand.

Whatistheendresultofthesecommandsiftheyaresuccessful？（）RMAN>showretentionpolicy；RMANconfigurationparametersfordatabasewithdb_unique_nameORCLare：CONFIGURERETENTIONPOLICYTOREDUNDANCY1；defaultBackupdatabasetag=gold_copyplusarchivelogtag=gold_copydeleteinput；Backupdatabasetag=silver_copyplusarchivelogtag=silver_copydeleteinput；

A.Attemptingtorestoresilver_copywillfail.

B.Attemptingtorestoregold_copywillfail.

C.Bothbackupswillbeavailableforrestorewithoutquestion.

D.Attemptingtorestoregold_copymayormaynotsucceed.

E.Youwillnotbeabletorestoreeithergold_copyorsilver_copy.

RMANautomaticallypropagateinformationaboutthedatabasestructure，archivedredologs，backupsets，anddatafilecopiesintotherecoverycatalogfromthetargetdatabase’scontrolfile.Thisinformationcanalsobepropagatedtothecatalogmanuallybyusingthe（）command.

A.LIST

B.SWITCH

C.VALIDATE

D.CONFIGURE

E.RESYNCCATALOG

F.UPGRADECATALOG