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1、课程名班级姓名学号信息管理英语07信息本（1）班张瑛70912030DATAWAREHOUSEDatawarehousingprovidesarchitecturesandtoolsforbusinessexecutivestosystematicallyorganize,understand,andusetheirdatatomakestrategicdecisions.Alargenumberoforganizationshavefoundthatdatawarehousesystemsarevaluabletoo
2、lsintoday'scompetitive,fastevolvingworld.Inthelastseveralyears,manyfirmshavespentmillionsofdollarsinbuildingenterprise-widedatawarehouses.Manypeoplefeelthatwithcompetitionmountingineveryindustry,datawarehousingisthelatestmust-havemarketingweapon——awaytokeepcusto
3、mersbylearningmoreabouttheirneeds.“So",youmayask,fullofintrigue,“whatexactlyisadatawarehouse?"Datawarehouseshavebeendefinedinmanyways,makingitdifficulttoformulatearigorousdefinition.Looselyspeaking,adatawarehousereferstoadatabasethatismaintainedseparatelyfromano
4、rganization'soperationaldatabases.Datawarehousesystemsallowfortheintegrationofavarietyofapplicationsystems.Theysupportinformationprocessingbyprovidingasolidplatformofconsolidated,historicaldataforanalysis.AccordingtoW.H.Inmon,aleadingarchitectintheconstructionof
5、datawarehousesystems,“adatawarehouseisasubject-oriented,integrated,time-variant,andnonvolatilecollectionofdatainsupportofmanagement'sdecisionmakingprocess."Thisshort,butcomprehensivedefinitionpresentsthemajorfeaturesofadatawarehouse.Thefourkeywords,subject-orien
6、ted,integrated,time-variant,andnonvolatile,distinguishdatawarehousesfromotherdatarepositorysystems,suchasrelationaldatabasesystems,transactionprocessingsystems,andfilesystems.Let'stakeacloserlookateachofthesekeyfeatures.(1)Subject-oriented:Adatawarehouseisorgani
7、zedaroundmajorsubjects,suchascustomer,vendor,product,andsales.Ratherthanconcentratingontheday-to-dayoperationsandtransactionprocessingofanorganization,adatawarehousefocusesonthemodelingandanalysisofdatafordecisionmakers.Hence,datawarehousestypicallyprovideasimpl
8、eandconciseviewaroundparticularsubjectissuesbyexcludingdatathatarenotusefulinthedecisionsupportprocess.(2)Integrated:Adatawarehouseisusuallyconstructedbyintegratingmu
