鐵路領域中多數(shù)據(jù)庫系統(tǒng)的研究與實現(xiàn).pdf

1、西南交通大學碩士學位論文鐵路領域中多數(shù)據(jù)庫系統(tǒng)的研究與實現(xiàn)姓名：鄧林申請學位級別：碩士專業(yè)：計算機應用技術(shù)指導教師：朱焱20120613西南交通大學碩士研究生學位論文第1I頁—__皇量量——_|量置_奠—_—墨冒I鼉—I——Il_—__—I——I__—_曹奠_—_—_AbstractAtpresent，enterprises’departmentsandpublicinstitutionsproducelarge鋤ountsofdata

2、andchoosedifferentwaystomanagethesedatabasedondifferentdatafeaturesandapplicationrequirementsThiscausesinformationisolationamongvariousdepartmentsItisverydifficulttosharedataamongdepartmentsTosolvethisproblem，weneedtesea

3、rchdataintegrationtechnologyHowevertheinformationintegrationismostlyimplementedattheupperlevelofallapplicationThedataintegrationanddatasharingonentireenterprisearchitecturehavenotbeensolvedMultidatabasesystemtechnologyha

4、sbecomeaneffectiveapproachtosolvetheinformationintegrationanddatasharingamongheterogeneousdatasourcesMultidatabasesystemtechnologiesaimatmultipleheterogeneous，distributiveandexistedlocaldatabasesystemsandprovideuserswith

5、aunifiedmultidatabaseenvironment，includingunifieddatatypedefinition，querylanguage，dataaccessmethodsandSOonwithoutlotofchangestothelocaldatabaseThethesisistosolvetheproblemoftheprofessionaldataintegrationandaccessintherai

6、lwayfieldSOastosupportavarietyofprofessionalapplicationsAchievingtheabovefunctionsthethesisneedstosolvetwoproblems：(1)professionaldataisstoredinheterogeneousdatasources，includingdifferenttypesofcommercialdatabasesorfiles

7、ystemHowtoutilizethemultidatabasetechnologytointegrateheterogeneousdatasourcesisachallenge(2)Fortheintegratedhomogeneousmultidatabasesystems，howtomaintaintheconsistencybetweenthesourcesandtargetisanotherissueInthepaperth

8、eissuesaboveweredeeplystudiedOnehomogeneousMultidatabasesystemwasimplementedThemainresearchworkincludes：Firstlytheintegrationstrategiesofheterogeneousdatabasewerestudied，homogeneousmlll廿一data：basearchitecturewasdesigned，

9、andonehomogeneousmulti—databasesystemWasimplementedSecondlyfordifferentdatasources，differentintegrationstrategiesweretakenAnaccessinterfaceofhomogeneousmultidatabasewasdesi霉ledforavarietyofapplicationsThirdlyaccordingtoc

10、haracteristicsofheterogeneousdata，updatingschemesamongstructureddata，betweentheuns仃ucl=11】陀dandstructureddataweredesignedrespectivelyformaintainingthedataconsistencyfinallythetechnicalsolutionsimplementedinthispaperwerev