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1、DATAWAREHOUSEDatawarehousingprovidesarchitecturesandtoolsforbusinessexecutivestosystematicallyorganize,understand,andusetheirdatatomakestrategicdecisions.Alargenumberoforganizationshavefoundthatdatawarehousesystemsarevaluabletoolsintoday'scompetitive,fa
2、stevolvingworld.Inthelastseveralyears,manyfirmshavespentmillionsofdollarsinbuildingenterprise-widedatawarehouses.Manypeoplefeelthatwithcompetitionmountingineveryindustry,datawarehousingisthelatestmust-havemarketingweapon——awaytokeepcustomersbylearningmo
3、reabouttheirneeds.“So",youmayask,fullofintrigue,“whatexactlyisadatawarehouse?"Datawarehouseshavebeendefinedinmanyways,makingitdifficulttoformulatearigorousdefinition.Looselyspeaking,adatawarehousereferstoadatabasethatismaintainedseparatelyfromanorganiza
4、tion'soperationaldatabases.Datawarehousesystemsallowfortheintegrationofavarietyofapplicationsystems.Theysupportinformationprocessingbyprovidingasolidplatformofconsolidated,historicaldataforanalysis.AccordingtoW.H.Inmon,aleadingarchitectintheconstruction
5、ofdatawarehousesystems,“adatawarehouseisasubject-oriented,integrated,time-variant,andnonvolatilecollectionofdatainsupportofmanagement'sdecisionmakingprocess."Thisshort,butcomprehensivedefinitionpresentsthemajorfeaturesofadatawarehouse.Thefourkeywords,su
6、bject-oriented,integrated,time-variant,andnonvolatile,distinguishdatawarehousesfromotherdatarepositorysystems,suchasrelationaldatabasesystems,transactionprocessingsystems,andfilesystems.Let'stakeacloserlookateachofthesekeyfeatures.(1)Subject-oriented:Ad
7、atawarehouseisorganizedaroundmajorsubjects,suchascustomer,vendor,product,andsales.Ratherthanconcentratingontheday-to-dayoperationsandtransactionprocessingofanorganization,adatawarehousefocusesonthemodelingandanalysisofdatafordecisionmakers.Hence,datawar
8、ehousestypicallyprovideasimpleandconciseviewaroundparticularsubjectissuesbyexcludingdatathatarenotusefulinthedecisionsupportprocess.(2)Integrated:Adatawarehouseisusuallyconstructedbyintegratingmultipleheterogeneoussources,suchasr
