Llaves surrogadas

1. DATA WAREHOUSING
Multi Dimensional
Data Modeling.
Surrogate Keys.

2. 2

3. 3

4.  A surrogate key is a unique identifier for data
warehouse records that replaces source primary keys
(business/natural keys)
4

5.  Protect against changes in source systems
5

6.  Allow integration from multiple sources
6

7.  Enable rows that do not exist in source data
7

8.  Track changes over time (e.g. new customer instances
when addresses change)
8

9.  Replace text keys with integers for efficiency
9

10.  Higher performance with numeric keys than with
long, alphanumeric keys
10

11.  The Data Warehouse Toolkit.Second
Edition.The Complete Guide to Dimensional
Modeling.Ralph Kimball.Margy Ross