Dw design 3_surro_keys
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Dw design 3_surro_keys

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Llaves surrogadas

Llaves surrogadas

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    Dw design 3_surro_keys Dw design 3_surro_keys Presentation Transcript

    • 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 (business/natural keys)4
    •  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