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开放封闭原则(OCP)
开放封闭原则转:http://baike.baidu.com/view/2493421.htm转:http://dev.csdn.net/article/38/38826.shtm 开放封闭原则(OCP,Open Closed Principle)是所有面向对象原则的核心。软件设计本身所追求的目标....
分类:其他好文   时间:2015-01-21 19:52:19    阅读次数:126
UML之轻松入门(2)-掌握Junit,让我们的开发更高效
使用UML不仅能够形象化的表达我们的程序思想,并且能够帮助我们提高程序的质量。一个杂乱无章的程序让维护者望而生畏,其成本也可想而知。在面向程序设计(OOD)中有5条原则是帮助我们设计一个高效、简洁的程序:1.单一职责原则(SRP) 2.开放-闭合原则(OCP) 3.Liskov替换原则(LSP).....
分类:其他好文   时间:2015-01-21 19:37:12    阅读次数:256
Oracle OCP认证考试题库解析052-7
QUESTION7SeetheExhibit:WhichstatementsaretrueregardingtheUSERStablespace?(Chooseallthatapply.)A.AbitmapisusedtorecordfreeextentsB.FreeextentsinformationismanagedwithinthetablespaceC.FreeextentsinformationismanagedintheSYSAUXtablespaceD.Thedatadictionarytabl..
分类:数据库   时间:2015-01-20 18:28:16    阅读次数:211
Oracle OCP认证考试题库解析052-5
QUESTION5Youwanttoenablearchivingonyourdatabase.Presently,thedatabaseisrunninginNOARCHIVELOGmode.Givenbelowarethestepstoaccomplishthetaskinrandomorder:1.Shutdowntheinstance.2.ExecutetheALTERDATABASEARCHIVELOGcommand.3.Startuptheinstanceandmountthedatabase.4..
分类:数据库   时间:2015-01-20 18:27:37    阅读次数:221
Oracle OCP认证考试题库解析052-8
QUESTION8Examinethevaluesforthefollowinginitializationparameters:FAST_START_MTTR_TARGET=0LOG_CHECKPOINT_INTERVAL=0Whichtwowillbetheimplicationsofthesevaluesinyourdatabase?(Choosetwo.)A.TheSGAadvisorwillbedisabledB.TheMTTRadvisorwillbedisabledC.Automaticchec..
分类:数据库   时间:2015-01-20 18:26:19    阅读次数:278
Oracle OCP认证考试题库解析052-6
QUESTION6Youwanttocheckthedetailsoffewerrorsthatusershavereported.Yousearchforthealertlogfileandexecutefewcommandstofindthelocationofthealertlogfile.ViewtheExhibitandcheckthecommandsexecuted.Whatisthelocationofthealert_orcl.logfile?A.ORACLE_HOME/dbsB.ORACEL..
分类:数据库   时间:2015-01-20 18:25:36    阅读次数:249
Oracle OCP认证考试题库解析052-2
QUESTION2Identifythememorycomponentfromwhichmemorymaybeallocatedfor:Sessionmemoryforthesharedserver,BuffersforI/OslavesOracleDatabaseRecoveryManager(RMAN)backupandrestoreoperationsA.LargePoolB.RedoLogBufferC.DatabaseBufferCacheD.ProgramGlobalArea(PGA)Correc..
分类:数据库   时间:2015-01-19 19:20:28    阅读次数:279
Oracle OCP认证考试题库解析052-3
QUESTION3YouexecutedthefollowingcommandtocreateatablespacecalledSALES_DATA:SQL>CREATETABLESPACEsales_dataDATAFILESIZE100MSEGMENTSPACEMANAGEMENTAUTO;WhichtwostatementsaretrueabouttheSALES_DATAtablespace?(Choosetwo)A.Thedatabaseautomaticallydeterminestheex..
分类:数据库   时间:2015-01-19 19:20:11    阅读次数:207
Oracle OCP认证考试题库解析052-1
QUESTION1Younoticethattheperformanceofthedatabasehasdegradedbecauseoffrequentcheckpoints.Whichtwoactionsresolvetheissue?(Choosetwo.)A.DisableautomaticcheckpointtuningB.CheckthesizeoftheredologfilesizeandincreasethesizeifitissmallC.SettheFAST_START_MTTR_TARG..
分类:数据库   时间:2015-01-19 19:20:06    阅读次数:171
Oracle OCP认证考试题库解析052-4
QUESTION4InwhichofthescenariowilltheDBAperformrecovery?(Chooseallthatapply.)A.ThealertlogfileiscorruptedB.AtablespaceisaccidentallydroppedC.OneoftheredologmembersiscorruptedD.AdatabaseuserterminatesthesessionabnormallyE.Theharddiskonwhichthedatafilesisstore..
分类:数据库   时间:2015-01-19 19:18:59    阅读次数:210
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