Saturday, March 15, 2008

What are slowly changing dimensions?

7 comments:

  1. SCD stands for Slowly changing dimensions. Slowly changing dimensions are of three types
    SCD1: only maintained updated values.
    Ex: a customer address modified we update existing record with new address.
    SCD2: maintaining historical information and current information by using
    A) Effective Date
    B) Versions
    C) Flags
    or combination of these
    scd3: by adding new columns to target table we maintain historical information and current information

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