数据库技术发展的思考-PowerPoint演示文稿.ppt

数据库技术发展的思考,孟小峰中国人民大学信息学院xfmeng,引言,BroadeningtheDatabaseFieldforVLDB2000coredatabasetechnologyinformationsystemsinfrastructuresreportingonmethods,issues,andproblemsfacedduringthedesign,development,anddeploymentofinnovativesolutionsforinformationmanagement,对数据库技术发展的思考（1）,数据库技术从诞生到现在，不到半个世纪的时间里，形成了坚实的理论基础、成熟的商业产品和广泛的应用领域，吸引越来越多的研究者加入关系模型实用的事务处理技术成熟的产品,对数据库技术发展的思考（2）,在成熟的关系DBMS之后，数据库的研究“泛数据”研究的趋势DBMS已经研究的没有问题了？新的处理要求在那里？“泛数据”研究X-data:XMLdata,streamingdata,X-computing:griddata,sensordata,p2pdata,ubiquitous/pervasivedata,对数据库技术发展的思考（3）,过去数据库的研究之所以成功，是因为其研究一直是“问题找人”式的研究，其特点在于：问题明确具体技术简单实用EFCodd提出关系模型JimGray提出的事务处理技术而且是关键的通用技术所形成的产品均是通用产品,对数据库技术发展的思考（4）,反观现在数据库的研究之所以不甚成功，可能在于目前数据库的研究是“人找问题”式的研究，其特点在于：“泛数据”研究的需求不甚明确技术复杂而且是特定数据处理的技术难以形成通用产品,对数据库技术发展的思考（5）,问题找人,成果斐然,人找问题,成果不明显,问题找人,问题在那里?,对数据库技术发展的思考（5）,数据库技术的发展错失了Web带来的机遇如何处理web上众多的数据源-高效数据管理如何构建web上的应用-高效的应用开发如何快速完成查询高效的查询处理IsGoogletheanswer?,对数据库技术发展的思考（6）,泛数据研究的本质问题TheRevolutioninDatabaseArchitectureJimGrayDatabasesareWebServicesPublish-SubscribeSystemSelfManagingandAlwaysUp,DataontheWeb,Differentformats:relational,metadata,documents,textAWebstandardfordataexchange,XML,isfixingitXMLcapturesallkindsofinformationoverawidespectrumXMLcomeswithafamilyofemergingstandards:XMLschema,XSL/T,Xquery,domainspecificschemasDifferentcomputers,platforms,languages,applicationsAstandardforWebservices,SOAP,isfixingitSOAPallowsubiquitouscomputingontheInternetSOAPcomeswithafamilyofemergingstandards:WSDL,UDDIThisprovidesauniformaccesstoinformationthedreamfordistributeddatamanagement,Thankyou.,未来数据库的研究（6）,coredatabasetechnologySelfAdaptation/SystemTuningNewUserInterfacesOne-Hundred-YearStorageinformationsystemsinfrastructuresWebInformationIntegrationIntegrationofText,Data,Code,andStreams,基于WebService的Web信息集成系统（W-DBMS),基于WebServices构建Web数据集成系统是目前较为理想的方法。WDBMS系统的初步目标是实现一个架构于WebService技术之上的Web数据集成系统。在Web应用开发中，它能起到传统DBMS的作用，即提高应用开发效率和提供数据独立性。在这个系统中，用户需要提供数据源信息以用于确定数据源和查找或者生成所需要的wrapper，集成计划，信息发送计划。系统通过符合用户需求的wrapper或者service得到包含用户目标数据的一系列XML文档。然后集成引擎通过查询这些XML文档得到最终所需要的结果。,参考文献,1S.Abiteboul,P.Buneman,andD.Suciu.DataontheWeb-FromRelationstoSemi-StructuredDataandXML,MorganKauffmannPublishers,2000.2A.Y.Levy,A.Rajaraman,andJ.J.Ordille.QueryingHeterogeneousInformationSourcesUsingSourceDescriptions,InProc.oftheVeryLargeDataBases(VLDB),pages251-262Bombay,India,September1996.3R.Bayardo,W.Bohrer,R.Brice,etal.InfoSleuth:Agent-BasedSemanticIntegrationofInformationinOpenandDynamicEnvironments.InProc.ofACMSIGMODInternationalConferenceManagementofData,pages195-206,Tucson,USA,May1997.4S.Bressan,C.Goh,K.Fynn,etal.TheContextInterchangeMediatorPrototype.IntheACMSIGMOD/PODSJointConference,pages525-527，Tucson,USA,May1997.5V.Christophides,S.Cluet,J.Simon.OnWrappingQueryLanguagesandEfficientXMLIntegration.InProc.ofACMSIGMODConferenceonManagementofData,pages141-152,Dallas,USA,May2000.6S.Cluet,C.Delobel,J.Simon,andK.Smaga.YourMediatorsNeedDataConversion!InProc.ofACMSIGMODConferenceonManagementofData,pages177-188,Seattle,USA,June1998.7D.ChamberlinJ.RobieD.Florescu.Quilt:AnXMLLanguageforHeterogeneousDataSources.InInternationalWorkshopontheWebandDatabases(WebDB),Dallas,USA,May2000.8H.Garcia-Molina,Y.Papakonstantinou,etal.TheTSIMMISApproachtoMediation:DataModelsandLanguages,InJournalofIntelligentInformationSystems,8(2):117-132,1997.9D.Florescu,A.Levy,andA.Mendelzon.DatabaseTechniquesfortheWorldWideWeb:ASurvey.ACMSIGMODRecord,27(3):59-74,September1998.10I.Muslea,Extractionpatternsforinformationextractiontasks:Asurvey.InProc.oftheAAAIWorkshoponMachineLearningforInformationExtraction,pages1-6,Orlando,USA,July1999.11B.Chidlovskii.AutomaticrepairingofWebWrappers.In3rdInternationalWorkshoponWebInformationandDataManagement,pages24-30,Atlanta,USA,November2001.12R.Baumgartner,S.Flesca,G.Gottlob.VisualWebinformationextractionwithLixto.InProc.oftheVeryLargeDataBases(VLDB),pages119-128,Roma,Italy,September200113A.SahuguetandF.Azavant.BuildingLight-WeightWrappersforLegacyWebData-SourcesUsingW4F.InProc.oftheVeryLargeDataBases(VLDB),pages738-741,1999.14J.Hammer,M.Brenning,H.Garcia-Molina,etal.Template-basedwrappersintheTSIMMISsystem.InProc.ofACMSIGMODConference,pages532-535,Tucson,USA,May1997.15I.Muslea,S.Minton,andC.A.Knoblock.STALKER:LearningextractionrulesforsemistructuredWeb-basedinformationsources.InProc.ofAAAIWorkshoponAIandInformationIntegration,pages74-81,Madison,USA,July1998.16C.-N.HsuandM.-T.Dung.Generatingfinite-statetransducersforsemi-structureddataextractionfromtheWeb.InformationSystems，23(8):521-538,1998.17N.Kushmerick,D.Weil,andR.Doorenbos.Wrapperinductionforinformationextraction.InProc.ofInternationalJointConferenceonArtificialIntelligence(IJCAI),pages729-735,Nagoya,Japan,August1997.18L.Liu,C.Pu,W.Han.XWRAP:AnXML-enabledWrapperConstructionSystemforWebInformationSources.InProc.ofInternationalConferenceonDataEngineering(ICDE),pages611-621,SanDiego,USA,February2000.19X.F.Meng,H.J.Lu,H.Y.Wang,M.Z.Gu.SG-WRAP:ASchema-GuidedWrapperGenerator.InProc.ofInternationalConferenceonDataEngineering(ICDE),pages331-332,SanJose,USA,February2002.20X.F.Meng,H.J.Lu,H.Y.Wang,M.Z.Gu.Schema-GuidedDataExtractionfromtheWeb.JournalofComputerScienceandTechnology(JCST),17(4),2002.21XFMeng,HYWang,DDHu,MZGu,SG-WRAMSchemaGuidedWrapperMaintenance:ADemonstration,ProceedingsofICDE2003,Mar5-8,2003,Bangalore,India.22N.Kushmerick.Wrapperverification.WorldWideWebJournal,2000,3(2):79-94.23N.Kushmerick.Regressiontestingforwrappermaintenance.InProceedingsofAAAI1999,page74-79,1999。24CAKnoblock,KLerman,SMinton,IMuslea.AccuratelyandReliablyExtractingDatafromtheWeb:AMachineLearningApproach.BulletinoftheIEEEComputerSocietyTechnicalCommitteeonDataEngineering,2000,23(4):33-41.,未来数据库的研究,SeniordatabaseresearcherMeetingSeniordatabaseresearchershavegatheredeveryfewyearstoassessthestateofdatabaseresearchandtorecommendproblemsandproblemareasdeserveadditionalfocus.LagunaBeach,Calif.in19891PaloAlto,Calif.(“Lagunita”)in19902and19953Cambri