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1、课程名班级姓名学号信息管理英语DATAWAREHOUSEDatawarehousingprovidesarchitecturesandtoolsforbusinessexecutivestosystematicallyorganize,understand,andusetheirdatatomakestrategicdecisions.Alargenumberoforganizationshavefoundthatdatawarehousesystemsarevaluabletoolsintoday'sc
2、ompetitive,fastevolvingworld.Inthelastseveralyears,manyfirmshavespentmillionsofdollarsinbuildingenterprise-widedatawarehouses.Manypeoplefeelthatwithcompetitionmountingineveryindustry,datawarehousingisthelatestmust-havemarketingweapon——awaytokeepcustomersb
3、ylearningmoreabouttheirneeds.“So",youmayask,fullofintrigue,“whatexactlyisadatawarehouse?"Datawarehouseshavebeendefinedinmanyways,makingitdifficulttoformulatearigorousdefinition.Looselyspeaking,adatawarehousereferstoadatabasethatismaintainedseparatelyfroma
4、norganization'soperationaldatabases.Datawarehousesystemsallowfortheintegrationofavarietyofapplicationsystems.Theysupportinformationprocessingbyprovidingasolidplatformofconsolidated,historicaldataforanalysis.AccordingtoW.H.Inmon,aleadingarchitectintheconst
5、ructionofdatawarehousesystems,“adatawarehouseisasubject-oriented,integrated,time-variant,andnonvolatilecollectionofdatainsupportofmanagement'sdecisionmakingprocess."Thisshort,butcomprehensivedefinitionpresentsthemajorfeaturesofadatawarehouse.Thefourkeywor
6、ds,subject-oriented,integrated,time-variant,andnonvolatile,distinguishdatawarehousesfromotherdatarepositorysystems,suchasrelationaldatabasesystems,transactionprocessingsystems,andfilesystems.Let'stakeacloserlookateachofthesekeyfeatures.(1)Subject-oriented
7、:Adatawarehouseisorganizedaroundmajorsubjects,suchascustomer,vendor,product,andsales.Ratherthanconcentratingontheday-to-dayoperationsandtransactionprocessingofanorganization,adatawarehousefocusesonthemodelingandanalysisofdatafordecisionmakers.Hence,datawa
8、rehousestypicallyprovideasimpleandconciseviewaroundparticularsubjectissuesbyexcludingdatathatarenotusefulinthedecisionsupportprocess.(2)Integrated:Adatawarehouseisusuallyconstructedbyintegratingmultipleheterogeneous
