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1、数据库系统原理填空题(推荐下载)（Principlesofdatabasesystemfillintheblanks(recommendeddownload)）4735databasesystemprinciples,simpleanswer2009/09/19Chapter1basicconceptsofdatabasesystems1.dataindependenceinthefilesystemreferstoindependence.(equipment)2.,inthedatabasemodeof
2、informationprocessing,occupythecentralposition.(data)3.DBMSisalayerofdatamanagementsoftwarebetweenandbetween.(userOS)4.,thedatamodelnotonlydescribesthecharacteristicsofthedataitself,butalsodescribesit.(datalink)In5.DBS,theconversionbetweentheuser'sdataandt
3、hedatainthediskisachieved.(DBMS)6.navigationdataisusedinhierarchicalandmeshmodels,andnavigationdataisusedinrelationalmodels.Pointerkey)Thethreelevelschemastructureofthe7.databaseisthethreeabstractionlevelofthepair.(data)Storingthreelevelstructuredefinition
4、sin8.DBSDBiscalled.(datadictionary)Theglobalstructureof9.DBSembodiesitsstructure.Modulefunction)10.DBMSopensforapplicationruntimeDBsystembuffer,mainlyforand.(datatransfermodeconversion)The11.levelmodelusesatypestructuretorepresentthelinksbetweenentities.(t
5、ree)12.,intheartificialmanagementphaseofdata,therelationbetweenprogramanddatais.One-to-onecorrespondence)13.,thesecurityandintegrityofthedatabaseisdefinedbythecompletionofthework.(DBA)14.,thebenefitsofdataindependenceare.(changesinthewaydatastoragedoesnota
6、ffecttheuseoftheapplication)Thethreetierarchitectureofthe15.databaseenablesuserstoabstractthedatainanabstractway,Noneedtocare.(datarepresentationandstorageinacomputer)SecondchaptersdatabasedesignandERmodel1.ERdatamodelsaregenerallyusedinthephaseofdatadesig
7、n.Conceptualdesign)2."whattables,whatfieldsaretheindexesonwhichfields?"thedesignshouldbelongtothedatabasedesignStage.(physicaldesign)3.,thedatamodelisusedtodescribethestructureandsemanticsofthedatabase.Thedatamodelhastwocategories:conceptualdatamodelandstr
8、uctureddatamodel,TheERmodelis.Conceptualdatamodel)4.,thedataimplementationphaseconsistsoftwoimportanttasks,oneisdata,andtheotherisapplicationcodinganddebugging.(loading)Theproblemthatthe5.ERdiagramtransformsi
