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1、DATAWAREHOUSEDatawarehousingprovidesarchitecturesandtoolsforbusinessexecutivestosystematicallyorganize,understand,andusetheirdatatomakestrategicdecisions.Alargenumberoforganizationshavefoundthatdatawarehousesystemsarevaluabletoolsintoday'scompetitive,fastevolvingworld.Inth
2、elastseveralyears,manyfirmshavespentmillionsofdollarsinbuildingenterprise-widedatawarehouses.Manypeoplefeelthatwithcompetitionmountingineveryindustry,datawarehousingisthelatestmust-havemarketingweapon——awaytokeepcustomersbylearningmoreabouttheirneeds.“So",youmayask,fullofi
3、ntrigue,“whatexactlyisadatawarehouse?"Datawarehouseshavebeendefinedinmanyways,makingitdifficulttoformulatearigorousdefinition.Looselyspeaking,adatawarehousereferstoadatabasethatismaintainedseparatelyfromanorganization'soperationaldatabases.Datawarehousesystemsallowforthein
4、tegrationofavarietyofapplicationsystems.Theysupportinformationprocessingbyprovidingasolidplatformofconsolidated,historicaldataforanalysis.AccordingtoW.H.Inmon,aleadingarchitectintheconstructionofdatawarehousesystems,“adatawarehouseisasubject-oriented,integrated,time-varian
5、t,andnonvolatilecollectionofdatainsupportofmanagement'sdecisionmakingprocess."Thisshort,butcomprehensivedefinitionpresentsthemajorfeaturesofadatawarehouse.Thefourkeywords,subject-oriented,integrated,time-variant,andnonvolatile,distinguishdatawarehousesfromotherdatareposito
6、rysystems,suchasrelationaldatabasesystems,transactionprocessingsystems,andfilesystems.Let'stakeacloserlookateachofthesekeyfeatures.(1)Subject-oriented:Adatawarehouseisorganizedaroundmajorsubjects,suchascustomer,vendor,product,andsales.Ratherthanconcentratingontheday-to-day
7、operationsandtransactionprocessingofanorganization,adatawarehousefocusesonthemodelingandanalysisofdatafordecisionmakers.Hence,datawarehousestypicallyprovideasimpleandconciseviewaroundparticularsubjectissuesbyexcludingdatathatarenotusefulinthedecisionsupportprocess.(2)Integ
8、rated:Adatawarehouseisusuallyconstructedbyintegratingmultipleheterogeneoussources,suchasr
