Whichtwooperationsrequireundodata？（）
A. committingatransaction
B. rollingbackatransaction
C. recoveringfromfailedtransactions
D. recordingatransactiontoredologfiles
E. rollingforwardduringinstancerecovery
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WhattypeofJavaEEapplicationcanbeupgradedtoWebLogic12cusingtheSmartUpgradetool？（）
A. GlassFish
B. iAS
C. WebLogicServer11g
D. JBoss
Whatisthepurposeofthecatalogcommand？（）
A. ToreviewRMANcontrolfileandrecoverycatalogmetadataandensurethatitscorrect
B. TodeleteRMANbackup-relatedmetadatafromtherecoverycatalog
C. Tocreatemetadatainthecontrolfileandtherecoverycatalogrelatedtobackupsetpieces
D. Tocreateareportthatlistsdatabasebackups
E. Torebuildtherecoverycatalog
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
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