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Evolution of Data Warehouse Conceptual Modeling

Evolution of Data Warehouse Conceptual Modeling. A Visual Tour Dr. Karen C. Davis April 2008. Overview. industry perspective research perspective architectures conceptual models research topics modeling ETL automated creation of schemas schema evolution and versioning.

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Evolution of Data Warehouse Conceptual Modeling

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  1. Evolution of Data WarehouseConceptual Modeling A Visual Tour Dr. Karen C. Davis April 2008

  2. Overview • industry perspective • research perspective • architectures • conceptual models • research topics • modeling ETL • automated creation of schemas • schema evolution and versioning

  3. In the beginning … [O03]

  4. Inmon vs. Kimball

  5. Star Schema [K03]

  6. Snowflake Schema [Z08]

  7. Data Warehouse Architectures

  8. [W95]

  9. [SMKK98]

  10. [CD97]

  11. [H+04]

  12. Conceptual Models based on: • ER: ME/R, StarER • graphs: DFM • UML: YAM2, UML Profile

  13. ME/R [SBHD98]

  14. StarER [TBC99]

  15. Dimensional Fact Model (DFM) [GMR98]

  16. YAM2: upper level [ASS06]

  17. YAM2: intermediate level [ASS06]

  18. YAM2: lower level [ASS06]

  19. A UML profile approach [LST06]

  20. Additional Semantics • explicit hierarchies • symmetric treatment of dimensions and measures • multiple hierarchies • correct aggregation • non-strict • m:n fact and dimension • changes to hierarchy • uncertainty • data at different granularities • unbalanced hierarchies • irregular hierarchies • annotation of dimension values • multidimensional constraints • security • missing data estimation • sequence classification • progressive query answering • modeling metadata • schema evolution [PJ99] [HLSB02]

  21. Extended Hierarchy Semantics [Banerjee and Davis 2007]

  22. Research Topics

  23. Modeling and Optimizing ETL [VSS02]

  24. Automating Schema Design

  25. Using Design Patterns [JS05] • extending DDPs • more expressive target model [Deshpande and Davis 2008]

  26. Using Ontologies [RA07]

  27. CASE Tools

  28. ME/R to Implementation Cognos Powerplay [QAD Business Intelligence] [HSB00]

  29. DFM to SQL [GR01]

  30. UML Profile in Rational Rose to Oracle [LST06]

  31. Conceptual to Logical to PhysicalUsing a Model Gen Approach extend [ACB05] [Nicholson, Vaidyanathan, and Davis 2008]

  32. Shema Evolution and Versioning

  33. Cross Schema Querying... Cross Version Querying…Schema Merging [GMR98, GLRV06]

  34. Future Directions • lack of a standard conceptual model • modeling security • mining-aware design • semantic gap between conceptual and logical models • modeling ETL • design process • interoperability with metadata • emerging applications [RALT06]

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