Data warehouse inmon versus kimball 2
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Data warehouse inmon versus kimball 2

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A presentation to describe two possible approaches to data warehouse creation, inmon and kimball.

A presentation to describe two possible approaches to data warehouse creation, inmon and kimball.

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    Data warehouse inmon versus kimball 2 Data warehouse inmon versus kimball 2 Presentation Transcript

    • Data Warehouse Architecture Inmon or Kimball ● DW Architecture ● How do we choose ? ● Bill Inmon ● Ralph Kimball ● Or some variant ?
    • Data Requirements ● What do your users need ?
    • Data Requirements ● What do your users need ? ● Can the the various groups agree ?
    • Data Requirements ● What do your users need ? ● Can the the various groups agree ? ● Do they have a time scale in mind ?
    • Data Requirements ● What do your users need ? ● Can the the various groups agree ? ● Do they have a time scale in mind ? ● Does your chief information officer have a time scale and budget set ? These points will influence your approach
    • What does Bill Inmon say ? ● One large integrated warehouse schema
    • What does Bill Inmon say ? ● One large integrated warehouse schema ● Longer to deliver and more expensive
    • What does Bill Inmon say ? ● One large integrated warehouse schema ● Longer to deliver and more expensive ● No big bang, iterative approach
    • What does Bill Inmon say ? ● One large integrated warehouse schema ● Longer to deliver and more expensive ● No big bang, iterative approach ● Top down approach based upon organisation
    • What does Bill Inmon say ? ● One large integrated warehouse schema ● Longer to deliver and more expensive ● No big bang, iterative approach ● Top down approach based upon organisation ● Could feed departmental data marts
    • What does Bill Inmon say ? ● One large integrated warehouse schema ● Longer to deliver and more expensive ● No big bang, iterative approach ● Top down approach based upon organisation ● Could feed departmental data marts ● More complex
    • What does Ralph Kimball say ? ● Based on data marts, small subject based schemas
    • What does Ralph Kimball say ? ● Based on data marts, small subject based schemas ● Based on what user communities want
    • What does Ralph Kimball say ? ● Based on data marts, small subject based schemas ● Based on what user communities want ● Quicker to deliver
    • What does Ralph Kimball say ? ● Based on data marts, small subject based schemas ● Based on what user communities want ● Quicker to deliver ● Later combine datamarts into warehouse
    • What does Ralph Kimball say ? ● Based on data marts, small subject based schemas ● Based on what user communities want ● Quicker to deliver ● Later combine datamarts into warehouse ● Dimensional modelling
    • What does Ralph Kimball say ? ● Based on data marts, small subject based schemas ● Based on what user communities want ● Quicker to deliver ● Later combine datamarts into warehouse ● Dimensional modelling ● Based upon star schema's
    • What does Ralph Kimball say ? ● Kimball data bus move data to staging and clean then populate data marts from staging must have conformed dimensions
    • What does Ralph Kimball say ? ● Kimball data bus move data to staging and clean then populate data marts from staging must have conformed dimensions ● Approach select business process determine the granularity choose dimensions identify facts
    • Ralph Kimball versus Bill Inmon Comparison Kimball Need Immediate Longer time scale Drive Business areas Enterprise Budget Smaller budget Larger budget Requirements Volatile More stable and growing Customer User base Corporate Sources Stable Changeable Lower Higher Projects Same cost as start up Cheaper than start up Inmon Startup cost
    • User Involvement ● Keep your users informed ● Make them a part of the process ● Under stand their needs ● Consider setting up user forums ● Consider having power users ● Consider sending out news letters and updates ● Your project could fail if the users drift away ! Periodically ask the users, does the solution meet your needs ?
    • Want to know more ? ● Thank you for taking the time to check this presentation ● Please check our web site below ● Please feel free to ask any question that you might have Semtech Solutions Ltd www.semtech-solutions.co.nzwww.semtech-solutions.co.nz Email info@semtech-solutions.co.nz