数据仓库的注意事项(PartI)

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Introduction
Identifyingandunderstandingthebusinessandoperationalrequirementsthatdriveanydatawarehousingprojectareessentialtotheproject抯successfulcompletion.Youcannotmeetyourclients?needsifyouhavenotassessedandanalyzedwhatthoseneedsareandhowyoucanaddressthem.

WhoKnows?

Themostimportantpartofthebusinessrequirementsprocessisfindingoutwhoknowswhattherequirementsshouldbe.Inmostcases,theanswerto"Whoknowswhatweneedtoknow?"isthatnobodyknowsitall,buteveryoneknowsapart.

AndWhatDoTheyKnow?

Theanswertothisquestionistheyknowfarmorethantheyimagine.Inmostcasesyoursourcesdonotknowtheyhavevaluableinformationandtowhatextenttheyaretheonlypossiblesourceforvitalinformationthatwillhelpinsuretheproject抯success.

TheBiologicalKnowledgeBase

Systemsaredesigned,created,maintainedandoperatedbypeoplewhohavefirsthandsysteminformation.Thisgroupofexpertsiscollectivelyidentifiedasthebiologicalknowledgebasethatyoumusttapeffectivelyinordertoextracttheinformationyourequire.

PlaybytheRules

Yourorganization抯businessrules(functionalrequirements)andoperationalcharacteristics(non-functionalrequirements)aretheessenceofthedesignrequirementsforyourproject.Theymustbecarefullycatalogedandanalyzedtoinsureinternalconsistency.Wheninconsistenciesarefound,youneedtoidentifythecauseoftheinconsistencies(youwillfindthatinsomecasestheinconsistenciesareperfectlyvalidandreasonable)anddeterminethepropermethod(s)foradjustingtheproject.

HowItHastoWorkandWhy

Foreachcomponentofyourproject,youwillneedtoidentifytheoperationalandbusinessrequirements.Forexample,therewillbetimeswhentheneedfor24X7availabilitywillsupercedetheneedfortotalaccuracy.Situationssuchasthismustbetakenintoconsiderationandincludedinyourdevelopmentplan.

Cultural/PoliticalConstraints

Culturalandpoliticalconstraintswillhaveaseriousimpactonyoursuccess,sotheymustbeaddressedwhilecollectingthebusinessrequirementsthatdefinetheproject.Eveninthosecaseswherethepoliticalenvironmentisopposedtotheneedsoftheprojectteam,youcanusepoliticalrelationshipstoincreasethevisibilityandacceptanceofyourproject,butonlyifyouhaveaclearunderstandingofthedynamicsinvolved.

Assessing/AddressingRisks

Everyprojectfacesrisks,someareminor,somesevere.Thesuccessfulprojectisbasedonidentifyingwhatthoserisksare,howlikelytheyaretooccur,howserioustheyareandwhatactionsarebesttopreventtheissuesfromarising.Identifythetacticstobeusedindealingwiththeissueswhentheydoarise,because,despiteyourbestefforts,somewillstilloccur.
MinetheBiologicalKnowledgeBase
Thebiologicalknowledgebaseisthecompletebodyofhumanknowledgeandintelligenceavailable.Thereadilyaccessiblebiologicalknowledgebaseprimarilyconsistsof:designersanddevelopers,knowledgeworkers,endusers,management,systemstaff,securitystaffandphysicalmaintenancestaff.共4页  第1页   
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