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ID:39413153
大小:6.47 MB
页数:364页
时间:2019-07-02
《DW 2.0 The Architecture for the Next Generation of Data Warehousing英文文献资料》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、DedicationforLynnInmon,mywifeandpartnerPPRELIMS-P374319.inddvRELIMS-P374319.inddv55/27/20085:55:30PM/27/20085:55:30PMPrefaceDatawarehousinghasbeenaroundforabout2decadesnowandhasbecomeanessen-tialpartoftheinformationtechnologyinfrastructure.Datawarehousin
2、goriginallygrewinresponsetothecorporateneedforinformationnotdata.Adatawarehouseisacon-structthatsuppliesintegrated,granular,andhistoricaldatatothecorporation.Butthereisaproblemwithdatawarehousing.Theproblemisthattherearemanydiffer-entrenditionsofwhatadat
3、awarehouseistoday.Thereisthefederateddatawarehouse.Thereistheactivedatawarehouse.Thereisthestarschemadatawarehouse.Thereisthedatamartdatawarehouse.Infactthereareaboutasmanyrenditionsofthedataware-houseastherearesoftwareandhardwarevendors.Theproblemisthat
4、therearemanydifferentrenditionsofwhattheproperstructureofadatawarehouseshouldlooklike.Andeachoftheserenditionsisarchitecturallyverydifferentfromtheothers.Ifyouweretoenteraroominwhichaproponentofthefeder-ateddatawarehousewastalkingtoaproponentoftheactived
5、atawarehouse,youwouldbehearingthesamewords,butthesewordswouldbemeaningverydifferentthings.Eventhoughthewordswerethesame,youwouldnotbehearingmeaningfulcommuni-cation.Whentwopeoplefromverydifferentcontextsaretalking,eventhoughtheyareusingthesamewords,there
6、isnoassurancethattheyareunderstandingeachother.Andthusitiswithfirst-generationdatawarehousingtoday.IntothismorassofconfusionastowhatadatawarehouseisorisnotcomesDW2.0.DW2.0isadefinitionofthenextgenerationofdatawarehousing.Unlikethetermdatawarehouse,DW2.0has
7、acrisp,well-definedmeaning.Thatmeaningisidentifiedanddefinedinthisbook.TherearemanyimportantarchitecturalfeaturesofDW2.0.Thesearchitecturalfeaturesrepresentanadvanceintechnologyandarchitecturebeyondfirst-generationdataware-houses.Thefollowingaresomeoftheimpo
8、rtantfeaturesofDW2.0discussedinthisbook:■Thelifecycleofdatawithinthedatawarehouseisrecognized.First-generationdatawarehousesmerelyplaceddataondiskstorageandcalleditawarehouse.Thetruthofthematteristhatdataonceplacedinadataw
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