小区物业综合管理系统的设计与实现外文翻译.doc

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1、.（学校名字）本科毕业设计（外文翻译）题目小区物业综合管理系统的设计与实现学生姓名专业班级学号院（系）指导教师(职称)完成时间Word文档.DatabasespaceorganizationSpatialdatamanagementhasbeenanactiveareaofresearchinthedatabasefieldfortwodecades，withmuchoftheresearchbeingfocusedondevelop-ingdatastructuresforstoringandindexingspatialda

2、ta.However,nocommercialdatabasesystempro-videsfacilitiesfordirectlydefiningandstoringspa-tialdata,andforniulatingqueriesbasedonresearchconditionsonspatialdata.Webelievethefollowingaretherelevantissuesonwhichnear-termresearchshouldbefocused(intheorderofdecreasingimpor

3、-tanceandurgency)．  　　First,relationalqueryoptimizationtechniquesneedtobeextendedtodealwithspatialqueries，thatis，queriesthatcontainsearchconditionsonspatialpredicatestobedeveloped.   　　Second,moreworkneedstobedoneonexperi-mentalvalidationoftherelativeperformanceofsom

4、eofthemorepromisingdatastructuresandindexingstructuresproposedthusfar,withconsiderationofamuchbroadersetofoperationsthanjustafewopera-tionsthathavetypicallybeenusedinthelimitedper-formancestudiesconductedthusfar.   　　Third,itisdifficulttobuildintoasingledata-basesyst

5、emmultipledatastructuresforspatialindex-ing,andallspatialoperatorsthatareusefulforawidevarietyofspatialapplications，assuch,itisdesirabletobuildadatabasesystemsothatitwillbeaseasyaspossibletoextendthesystemwithaddi-tionaldatastructuresandspatialoperators．IftheDBMSprov

6、idesawaytointeractivelyandupdatethedatabase,aswellasinterrogateitcapabilityallowsformanagingpersonaldata-Aceshowever,itdoesnotautomaticallyleaveanaudittrailofactionsanddoesnotprovidethekindsofcontrolanecessaryinamultiuserorganization.These-controlsareonlyavailablewhe

7、nasetofapplicationprogramsarecustomizedforeachdataentryandupdatingfunction.   Word文档.　　SoftwareforpersonalcomputerswhichperformmeoftheDBMSfunctionshavebeenverypopular  arsenalcomputerswereintendedforusebyindividualsforpersonalinformationstorageandprocess-Thesemachine

8、shavealsobeenusedextensivelysmallenterprises,professionalslikedoctors,acrylics,engineers,lawyersandsoon．Bythenatureof.intendedusage