Data Warehouse Architecture Inmon or Kimball

A presentation that considers the approach to creating a
data warehouse, Inmon or Kimball. Which approach to use
and how do they compare ?

Transcript

1. Data Warehouse Architecture Inmon or Kimball • DW Architecture • How do we choose ? • Bill Inmon • Ralph Kimball • Or some variant ?
2. Data Requirements • What do your users need ?
3. Data Requirements • What do your users need ? • Can the the various groups agree ?
4. Data Requirements • What do your users need ? • Can the the various groups agree ? • Do they have a time scale in mind ?
5. 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
6. What does Bill Inmon say ? • One large integrated warehouse schema
7. What does Bill Inmon say ? • One large integrated warehouse schema • Longer to deliver and more expensive
8. What does Bill Inmon say ? • One large integrated warehouse schema • Longer to deliver and more expensive • No big bang, iterative approach
9. 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
10. 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
11. 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
12. What does Ralph Kimball say ? • Based on data marts, small subject based schemas
13. What does Ralph Kimball say ? • Based on data marts, small subject based schemas • Based on what user communities want
14. What does Ralph Kimball say ? • Based on data marts, small subject based schemas • Based on what user communities want • Quicker to deliver
15. 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
16. 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
17. 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
18. What does Ralph Kimball say ? • Kimball data bus move data to staging and clean then populate data marts from staging must have conformed dimensions
19. 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
20. 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
21. 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 ?
22. 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.nz www.semtech-solutions.co.nz Email info@semtech-solutions.co.nz