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事务的持久性是由DBMS的( )实现的。 A) 事务管理子系统 B) 并发控制子系统 C) 恢复管理子系统 D) 完整性约束机制
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中级数据库系统工程师《填空》真题及答案
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DBMS中实现事务持久性的子系统是
安全性管理子系统
完整性管理子系统
并发控制子系统
恢复管理子系统
事务的持久性是由DBMS的什么来实现的
事务管理子系统
并发控制子系统
恢复管理子系统
完整性约束机制
事务的原子性是由DBMS的实现的事务的一致性是由DBMS的实现的事务的隔离性是由DBMS的实现的事务
保证事务的持久性是数据库管理系统中哪个部件的责任
事务管理
恢复管理
并发控制
程序员
数据库管理系统中是事务管理部件的责任
保持事务的原子性
保持事务的持久性
保持事务的隔离性
保持事务的一致性
DBMS中实现事务持久性的子系统是
安全性管理子系统
完整性管理子系统
并发控制子系
保证事务的持久性是数据库管理系统中部件的责任
事务管理
恢复管理
并发控制
程序员
确保事务的原子性和持久性是IBMS的事务管理器中______机制的责任
事务的持久性是由DBMS的实现的
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在测试用例设计中有语句覆盖条件覆盖判定覆盖即分支覆盖路径覆盖等其中43是最强的覆盖准则为了对如图9-2所示的程序段进行覆盖测试必须适当地选取测试数据组若xy是两个变量可供选择的测试数据组共有ⅠⅡⅢⅣ四组如表9-3所示则实现判定覆盖至少应采用的测试数据组是44实现条件覆盖至少应采用的测试数据组是45实现路径覆盖至少应采用的测试数据组是46或47 表9-3测试数据组 z y 测试数据组Ⅰ 0 3 测试数据组Ⅱ 1 2 测试数据组Ⅲ -1 2 测试数据组Ⅳ 3 1 46
TheRationalUnifiedProcessRUPisasoftwareengineeringprocesswhichcapturesmanyofbestpracticesinmodemsoftwaredevelopment.Thenotionsof36andscenarioshavebeenproventobeanexcellentwaytocapturefunctionrequirements.RUPcanbedescribedintwodimensions-timeandcontent.Inthetimedimensionthesoftwarelifecycleisbrokenintocycles.Eachcycleisdividedintofourconsecutive37whichisconcludedwithawell-defined38andcanbefurtherbrokendowninto39-acompletedevelopmentloopresultinginareleaseofanexecutableproductasubsetofthefinalproductunderdevelopmentwhichgrowsincrementallytobecomethefinalsystem.Thecontentstructurereferstothedisciplineswhichgroup40logicallybynature. 38
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Thepurposeoftherequirementsdefinitionphaseistoproduceaclearcompleteconsistentandtestable6ofthetechnicalrequirementsforthesoftwareproduct. Duringtherequirementsdefinitionphasetherequirementsdefinitionteamusesaniterativeprocesstoexpandabroadstatementofthesystemrequirementsintoacompleteanddetailedspecificationofeachfunctionthatthesoftwaremustperformandeach7thatitmustmeet.Thestartingpointisusuallyasetofhigh-levelrequirementsfromthe8thatdescribetheprojectorproblem. Ineithercasetherequirementsdefinitionteamformulatesanoverallconceptforthesystemandthendefines9showinghowthesystemwillbeoperatedpublishesthesystemandoperationsconceptdocumentandconductsasystemconceptreviewSCR. FollowingtheSCRtheteamderives10requirementsforthesystemfromthehighlevelrequirementsandthesystemandoperationsconcept.Usingstructuredorobject-orientedanalysistheteamspecifiesthesoftwarefunctionsandalgorithmsneededtosatisfyeachdetailedrequirement. 8
Withthewidespreaduseofthepersonalcomputermanyauthoritiesinthefieldof56havepointedouttheneedforcomputerliteracy. Unfortunatelythereisno57agreementastowhattheterm"computerliteracy"means.Somefeelthatcomputerliteracymeansknowinghowtomakethecomputer"compute";thatisknowinghowtoprogramcomputersinoneormoreprogramminglanguages. Othersfeelthatknowinghowtoprogramismerelyasmallsegmentofcomputerliteracy.Thesepeople58themajoremphasisinschoolsshouldbeonteachinghowtoeffectivelyusethemanysoftwarepackagesthatareavailable. Stillotherssuggestthatcomputerliteracyeducationisnotrequired.Theysuggestthatcomputersarebeingsorapidlyintegratedintooursocietythatusingacomputerwillbeas59asusingatelephoneoravideotaperecorderandthatspecialeducationwillnotbenecessary.60ofone’sdefinitionofcomputerliteracyitisrecognizedbymostthatlearningtouseacomputerisindeedanimportantskillinmodernsociety. 59
OneoftheguidelinesinwritingtheCcodeforasoftwaretoolisasfollows:writecodethatisasclearandassimplea76.TheClanguagecanbedifficulttoreadifyoucombineall77featuresinasinglestatement.Breakcomplicated78intoseveraleasytounderstandstatementsforthe79ofreadability.Thisstylehelpstomakeyourprogramsmore80anderror-free. 76
ApplicationdevelopmentincreasinglymeansWindowsdevelopmentandthepopularityofvisualdevelopmenttoolshas95intandemwithWindowsitself.Thesetoolscreatebeautifulwindowing96andtheirfastdevelopmentcyclesandeasylearningcurvesmakethemagood97formanytypesofPCdevelopmentprojects.Today’sdevelopersareleveragingthesetoolsandtheabundanceofheappowerfulPCstoshiftthebalanceofpowertothedesktop. AstheworldmovesinexorablytowardWindowsandother98userinterfacesdeveloperscanchoosefromanabundanceof99orientedtools.PopularexamplesincludeMicrosoftCorp.’sVisualBasicPowersoftCorp.’sPowerBuilderGuptaTechnologyCorp.’sSQLWindowsandsoon. 98
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OriginallyintroducedbyNetscapeCommunications21areageneralmechanismwhichHTTPServersideapplicationssuchasCGI22canusetobothstoreandretrieveinformationontheHTTP23sideoftheconnection.BasicallyCookiescanbeusedtocompensateforthe24natureofHTTP.Theadditionofasimplepersistentclient-sidestatesignificantlyextendsthecapabilitiesofWWW-based25. 24
Thegrowthofswitchinghas135anewgenerationofnetworkmanagementtoolsthathelp136copewiththechallenges137themtocorrelatedevicealarmsinorderto138pinpointrootcausesortomonitorservicelevelswithoutdependingonIPsubnetschemes.Thesenewtoolshavebecomeessentialtocopingwiththeprimary139effectofanytreatmentthatsignificantlyincreasesnetworkflexibility:addedcomplexity. 137
OriginallyintroducedbyNetscapeCommunications21areageneralmechanismwhichHTTPServersideapplicationssuchasCGI22canusetobothstoreandretrieveinformationontheHTTP23sideoftheconnection.BasicallyCookiescanbeusedtocompensateforthe24natureofHTTP.Theadditionofasimplepersistentclient-sidestatesignificantlyextendsthecapabilitiesofWWW-based25. 22
In85softwareonequestionofnear-universalinterestishowrapidlyWindowsNTwhichbeganshippinglastsummerwillbe86inthemarketplaceandforwhatuses.Forthemostpartobserversare87abouttheoperatingsystem’slongtermprospectsbutexpectittoremainon88ratherthandesktopsduring1994sayingthatitwon’tbecomeamainstreamproductuntil89PCstypicallyhave16to24MBofRAMwhichisunlikelytohappennextyear. 88是
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在软件开发过程中常用图作为描述工具如DFD就是面向50分析方法的描述工具在一套分层DFD中如果某一张图中有N个加工process则这张图允许有51张子图在一张DFD图中任意两个加工之间52在画分层DFD时应注意保持53之间的平衡 52
TheRationalUnifiedProcessRUPisasoftwareengineeringprocesswhichcapturesmanyofbestpracticesinmodemsoftwaredevelopment.Thenotionsof36andscenarioshavebeenproventobeanexcellentwaytocapturefunctionrequirements.RUPcanbedescribedintwodimensions-timeandcontent.Inthetimedimensionthesoftwarelifecycleisbrokenintocycles.Eachcycleisdividedintofourconsecutive37whichisconcludedwithawell-defined38andcanbefurtherbrokendowninto39-acompletedevelopmentloopresultinginareleaseofanexecutableproductasubsetofthefinalproductunderdevelopmentwhichgrowsincrementallytobecomethefinalsystem.Thecontentstructurereferstothedisciplineswhichgroup40logicallybynature. 40
Thegrowthofswitchinghas135anewgenerationofnetworkmanagementtoolsthathelp136copewiththechallenges137themtocorrelatedevicealarmsinorderto138pinpointrootcausesortomonitorservicelevelswithoutdependingonIPsubnetschemes.Thesenewtoolshavebecomeessentialtocopingwiththeprimary139effectofanytreatmentthatsignificantlyincreasesnetworkflexibility:addedcomplexity. 135
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ApplicationdevelopmentincreasinglymeansWindowsdevelopmentandthepopularityofvisualdevelopmenttoolshas95intandemwithWindowsitself.Thesetoolscreatebeautifulwindowing96andtheirfastdevelopmentcyclesandeasylearningcurvesmakethemagood97formanytypesofPCdevelopmentprojects.Today’sdevelopersareleveragingthesetoolsandtheabundanceofheappowerfulPCstoshiftthebalanceofpowertothedesktop. AstheworldmovesinexorablytowardWindowsandother98userinterfacesdeveloperscanchoosefromanabundanceof99orientedtools.PopularexamplesincludeMicrosoftCorp.’sVisualBasicPowersoftCorp.’sPowerBuilderGuptaTechnologyCorp.’sSQLWindowsandsoon. 96
OneoftheguidelinesinwritingtheCcodeforasoftwaretoolisasfollows:writecodethatisasclearandassimplea76.TheClanguagecanbedifficulttoreadifyoucombineall77featuresinasinglestatement.Breakcomplicated78intoseveraleasytounderstandstatementsforthe79ofreadability.Thisstylehelpstomakeyourprogramsmore80anderror-free. 78
在测试用例设计中有语句覆盖条件覆盖判定覆盖即分支覆盖路径覆盖等其中43是最强的覆盖准则为了对如图9-2所示的程序段进行覆盖测试必须适当地选取测试数据组若xy是两个变量可供选择的测试数据组共有ⅠⅡⅢⅣ四组如表9-3所示则实现判定覆盖至少应采用的测试数据组是44实现条件覆盖至少应采用的测试数据组是45实现路径覆盖至少应采用的测试数据组是46或47 表9-3测试数据组 z y 测试数据组Ⅰ 0 3 测试数据组Ⅱ 1 2 测试数据组Ⅲ -1 2 测试数据组Ⅳ 3 1 44
OneoftheguidelinesinwritingtheCcodeforasoftwaretoolisasfollows:writecodethatisasclearandassimplea76.TheClanguagecanbedifficulttoreadifyoucombineall77featuresinasinglestatement.Breakcomplicated78intoseveraleasytounderstandstatementsforthe79ofreadability.Thisstylehelpstomakeyourprogramsmore80anderror-free. 80
在软件开发过程中常用图作为描述工具如DFD就是面向50分析方法的描述工具在一套分层DFD中如果某一张图中有N个加工process则这张图允许有51张子图在一张DFD图中任意两个加工之间52在画分层DFD时应注意保持53之间的平衡 50
Withthewidespreaduseofthepersonalcomputermanyauthoritiesinthefieldof56havepointedouttheneedforcomputerliteracy. Unfortunatelythereisno57agreementastowhattheterm"computerliteracy"means.Somefeelthatcomputerliteracymeansknowinghowtomakethecomputer"compute";thatisknowinghowtoprogramcomputersinoneormoreprogramminglanguages. Othersfeelthatknowinghowtoprogramismerelyasmallsegmentofcomputerliteracy.Thesepeople58themajoremphasisinschoolsshouldbeonteachinghowtoeffectivelyusethemanysoftwarepackagesthatareavailable. Stillotherssuggestthatcomputerliteracyeducationisnotrequired.Theysuggestthatcomputersarebeingsorapidlyintegratedintooursocietythatusingacomputerwillbeas59asusingatelephoneoravideotaperecorderandthatspecialeducationwillnotbenecessary.60ofone’sdefinitionofcomputerliteracyitisrecognizedbymostthatlearningtouseacomputerisindeedanimportantskillinmodernsociety. 57
100whethertogowithasharedorswitchedfastLANtechnologyonceyoustarttomaxoutyoursharedEthernetoftoken-ringLANistoughcall.Usersandanalystsinvolvedin101high-speedLANshavelearnedthebenefitsofeach.Howevertherearetrade-offstoeachand102whichfastLANtechnologytochooseiscriticalfor103networkperformanceproblemsand104costlypurchasingmistakes. 103
In85softwareonequestionofnear-universalinterestishowrapidlyWindowsNTwhichbeganshippinglastsummerwillbe86inthemarketplaceandforwhatuses.Forthemostpartobserversare87abouttheoperatingsystem’slongtermprospectsbutexpectittoremainon88ratherthandesktopsduring1994sayingthatitwon’tbecomeamainstreamproductuntil89PCstypicallyhave16to24MBofRAMwhichisunlikelytohappennextyear. 86是
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100whethertogowithasharedorswitchedfastLANtechnologyonceyoustarttomaxoutyoursharedEthernetoftoken-ringLANistoughcall.Usersandanalystsinvolvedin101high-speedLANshavelearnedthebenefitsofeach.Howevertherearetrade-offstoeachand102whichfastLANtechnologytochooseiscriticalfor103networkperformanceproblemsand104costlypurchasingmistakes. 101
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