Whatisthepurposeofthecatalogcommand？（）
A. ToreviewRMANcontrolfileandrecoverycatalogmetadataandensurethatitscorrect
B. TodeleteRMANbackup-relatedmetadatafromtherecoverycatalog
C. Tocreatemetadatainthecontrolfileandtherecoverycatalogrelatedtobackupsetpieces
D. Tocreateareportthatlistsdatabasebackups
E. Torebuildtherecoverycatalog
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Yourdatabaseinstanceisstartedusingtheserverparameterfile（SPFILE）.YouexecutedacommandtochangethevalueoftheLOG_BUFFERinitializationparameter：ALTERSYSTEMSETLOG_BUFFER=32MSCOPE=BOTH；Whatwouldbetheoutcomeofthiscommand（）
A. ThecommandsucceedsonlyifAutomaticMemoryManagementisnotenabled.
B. Thecommandsucceeds，butyouneedtorestartthedatabaseforchangestotakeeffect.
C. Thecommandreturnsanerrorbecausethesizeoftheredologbuffercannotbechangeddynamically.
D. TheparametervalueischangedanditcomesintoeffectassoonasspacebecomesavailableintheSystemGlobalArea（SGA）.
物质世界的多样性为人生选择提供了多种可能性的（）
A. 主观条件
B. 客观基础
C. 发展道路
D. 现实依据
WhichtwostatementsaretrueregardingthedatabaseinARCHIVELOGmode？（）
A. Youhavetoshutdownthedatabasetoperformthebackups.
B. Archivinginformationiswrittentothedatafilesandredologfiles.
C. Youcanperformcompletedatabasebackupswithoutclosingthedatabase.
D. OnlineredologfileshavetobemultiplexedbeforeputtingthedatabaseinARCHIVELOGmode.
E. AllthepreviousdatabasebackupsbecomeinvalidafteryouconfigurethedatabasetoARCHIVELOGmode.
Youneedtorestoresomefilesfromafilesystem.Thefilesystemwasbackedupfromasnapshot.Whichcommandwillcorrectlyrestorethesefiles？（）
A. fssnap-i
B. fssnap-r
C. ufsrestore-i
D. snaprestore-i
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