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DATA WAREHOUSINGMulti DimensionalData Modeling.Surrogate Keys.
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   A surrogate key is a unique identifier for data        warehouse records that replaces source primary keys        (bus...
   Protect against changes in source systems5
   Allow integration from multiple sources6
   Enable rows that do not exist in source data7
   Track changes over time (e.g. new customer instances        when addresses change)8
   Replace text keys with integers for efficiency9
   Higher performance with numeric keys than with     long, alphanumeric keys10
   The Data Warehouse Toolkit.Second    Edition.The Complete Guide to Dimensional    Modeling.Ralph Kimball.Margy Ross
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Dw design 3_surro_keys

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Llaves surrogadas

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Transcript of "Dw design 3_surro_keys"

  1. 1. DATA WAREHOUSINGMulti DimensionalData Modeling.Surrogate Keys.
  2. 2. 2
  3. 3. 3
  4. 4.  A surrogate key is a unique identifier for data warehouse records that replaces source primary keys (business/natural keys)4
  5. 5.  Protect against changes in source systems5
  6. 6.  Allow integration from multiple sources6
  7. 7.  Enable rows that do not exist in source data7
  8. 8.  Track changes over time (e.g. new customer instances when addresses change)8
  9. 9.  Replace text keys with integers for efficiency9
  10. 10.  Higher performance with numeric keys than with long, alphanumeric keys10
  11. 11.  The Data Warehouse Toolkit.Second Edition.The Complete Guide to Dimensional Modeling.Ralph Kimball.Margy Ross
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