Dw design 3_surro_keys

441 views

Published on

Llaves surrogadas

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
441
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
5
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

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

×