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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DatabasespaceorganizationSpatialdatamanagementhasbeenanactiveareaofresearchinthedatabasefieldfortwodecades,withmuchoftheresearchbeingfocusedondevelop-ingdatastructuresforstoringandindexingspatialdata.Ho
2、wever,nocommercialdatabasesystempro-videsfacilitiesfordirectlydefiningandstoringspa-tialdata,andforniulatingqueriesbasedonresearchconditionsonspatialdata.Webelievethefollowingaretherelevantissuesonwhichnear-termresearchshouldbefocused(intheorderofdecreasingimporta
3、nceandurgency).First,relationalqueryoptimizationtechniquesneedtobeextendedtodealwithspatialqueries,thatis,queriesthatcontainsearchconditionsonspatialpredicatestobedeveloped・Second,moreworkneedstobedoneonexperi-mentalvalidationoftherelativeperformanceofsomeofthemor
4、epromisingdatastructuresandindexingstructuresproposedthusfar,withconsiderationofamuchbroadersetofoperationsthanjustafewopera-tionsthathavetypicallybeenusedinthelimitedper-formancestudiesconductedthusfar.Third,itisdifficulttobuildintoasingledata-basesystemmultipled
5、atastructuresforspatialindex-ing,andallspatialoperatorsthatareusefulforawidevarietyofspatialapplications,assuch,itisdesirabletobuildadatabasesystemsothatitwillbeaseasyaspossibletoextendthesystemwithaddi-tionaldatastructuresandspatialoperators.IftheDBMSprovidesaway
6、tointeractivelyandupdatethedatabase,aswellasinterrogateitcapabilityallowsformanagingpersonaldata-Aceshowever,itdoesnotautomaticallyleaveanaudittrailofactionsanddoesnotprovidethekindsofcontrolanecessaryinamultiuserorganization.These-controlsareonlyavailablewhenaset
7、ofapplicationprogramsarecustomizedforeachdataentryandupdatingfunction.SoftwareforpersonalcomputerswhichperformmeoftheDBMSfunctionshavebeenverypopulararsenalcomputerswereintendedforusebyindividualsforpersonalinformationstorageandprocess-Thesemachineshavealsobeenuse
8、dextensivelysmallenterprises,professionalslikedoctors,acrylics,engineers,lawyersandsoon.Bythenatureof.intendedusage,databasesystemsonthesemachinesexcept
