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下列不属于并行数据库的系统结构的是()。
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关于并行数据库系统的叙述中错误的是
无共享的结构是支持并行数据库系统的最好的并行结构
在并行处理中,许多操作是同时执行的,而不是串行处理的
共享主存储器系统有时又称作群机
并行系统通过并行的使用多个CPU和磁盘来提高处理速度
关于并行数据库下列说法错误的是______
层次结构可以分为两层,顶层是无共享结构,底层是共享内存或共享磁盘结构
无共享结构通过最小化共享资源来降低资源竞争,因此具有很高的可扩展性,适合于OLTP应用
并行数据库系统经常通过负载均衡的方法来提高数据库系统的业务吞吐率
并行数据库系统的主要目的是实现场地自治和数据全局透明共享
并行数据库的体系结构中的______结构是支持数据库系统最好的结构
并行数据库有多种体系结构比较适用于银行出纳民航售票等OLTP之类应用的并行数据库系统结构是_____
共享内存
共享磁盘
无共享结构
层次结构
数据划分对于并行数据库系统的性能有很大的影Ⅱ向下列哪种方法不属于一维数据划分
轮转法
散列划分
BERD划分
范围划分
下列______不属于数据库设计的内容
数据库管理系统
数据库概念结构
数据库逻辑结构
数据库物理结构
并行数据库有多种体系结构比较适用于中小型系统的并行数据库系统结构是______
共享内存
共享磁盘
无共享结构
层次结构
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Inlookingattheclassstructureofanentiresystemwemayfindthatitsinheritance1iseitherwideandshallownarrowanddeeporbalanced.Classstructuresthatarewideandshallowusuallyrepresentforestsof2classesthatcanbemixedandmatched.Classstructuresthatarenarrowanddeeprepresenttreesofclassesthatarerelatedbyacommonancestor.Thereareadvantagesanddisadvantagestoeachapproach.Forestsofclassesaremoreloosely3buttheymaynotexploitallthecommonalitythatexists.Treesofclassesexploitthiscommonalitysothatindividualclassesaresmallerthaninforests.Howevertounderstandaparticularclassitisusuallynecessarytounderstandthemeaningofalltheclassesitinheritsfromoruses.Thepropershapeofaclassstructureishighlyproblem-dependent.Wemustmakesimilartrade-offsamonginheritanceaggregationandusingrelation-ships.ForexampleshouldtheclassCarinheritcontainorusetheclassesnamedEngineandWheelInthiscasewesuggestthatan4relationshipismoreappropriatethaninheritancerelationship.MeyerstatesthatbetweentheclassAandB5isappropriateifeveryinstanceofBmayalsobeviewedasaninstanceofA.TheclientrelationshipisappropriatewheneveryinstanceofBsimplypossessesoneormoreattributesofA.Fromanotherperspectiveifthebehaviorofanobjectismorethanthesumofitsindividualpartsthencreatinganaggregationrelationshipratherthananinheritancerelationshipbetweentheappropriateclassesisprobablysuperior.4
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DOMisaplatform-andlanguage-1APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented2DOMisa3-basedAPItodocumentswhichrequiresthewholedocumenttoberepresentedin4whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge5documentsthatdonotfitintothememoryavailableforprocessing.1
IS09000:2000标准是_____系列标准
已经发布实施的标准包括已确认或修改补充的标准经过实施一定时期后对其内容再次审查以确保其有效性先进性和适用性其周期一般不超过______年
甲将其一篇短文心灵的呼唤投递给杂志社未经甲的许可杂志社便委托乙对甲的短文进行修改然后杂志社将署名为乙和甲的短文发表在其刊物上则______
多媒体应用需要对庞大的数据进行压缩常见的压缩编码方法可分为两大类一类是无损压缩法另一类是有损压缩法也称12属于无损压缩法2
人耳能听得到的音频信号的频率范围是20Hz~20kHz包括语音音乐和其它声音其中语音频率范围通常为______
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软件著作权受法律保护的期限是______一旦保护期限届满权利自行终止成为社会公众可以自由使用的知识
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我国著作权法中______系指同一概念
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