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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.Alargenumberoforganizationshavefoundthatdatawarehousesystemsarevaluabletoolsintoday'scompetiti
2、ve,fastevolvingworld.Inthelastseveralyears,manyfirmshavespentmillionsofdollarsinbuildingenterprise-widedatawarehouses.Manypeoplefeelthatwithcompetitionmountingineveryindustry,datawarehousingisthelatestmust-havemarketingweapon——awaytokeepcustomersbylearningmoreabouttheirneeds.“So",y
3、oumayask,fullofintrigue,“whatexactlyisadatawarehouse?"Datawarehouseshavebeendefinedinmanyways,makingitdifficulttoformulatearigorousdefinition.Looselyspeaking,adatawarehousereferstoadatabasethatismaintainedseparatelyfromanorganization'soperationaldatabases.Datawarehousesystemsallowf
4、ortheintegrationofavarietyofapplicationsystems.Theysupportinformationprocessingbyprovidingasolidplatformofconsolidated,historicaldataforanalysis.AccordingtoW.H.Inmon,aleadingarchitectintheconstructionofdatawarehousesystems,“adatawarehouseisasubject-oriented,integrated,time-variant,
5、andnonvolatilecollectionofdatainsupportofmanagement'sdecisionmakingprocess."Thisshort,butcomprehensivedefinitionpresentsthemajorfeaturesofadatawarehouse.Thefourkeywords,subject-oriented,integrated,time-variant,andnonvolatile,distinguishdatawarehousesfromotherdatarepositorysystems,s
6、uchasrelationaldatabasesystems,transactionprocessingsystems,andfilesystems.Let'stakeacloserlookateachofthesekeyfeatures.(1)Subject-oriented:Adatawarehouseisorganizedaroundmajorsubjects,suchascustomer,vendor,product,andsales.Ratherthanconcentratingontheday-to-dayoperationsandtransac
7、tionprocessingofanorganization,adatawarehousefocusesonthemodelingandanalysisofdatafordecisionmakers.Hence,datawarehousestypicallyprovideasimpleandconciseviewaroundparticularsubjectissuesbyexcludingdatathatarenotusefulinthedecisionsupportprocess.(2)Integrated:Adatawarehouseisusually
8、constructedbyintegratingmu
