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Dimensional data model
1.
2.
Data Extraction Layer
3.
Staging Area
4.
ETL Layer
5.
Data Storage Layer
6.
Data Logic Layer
7.
Data Presentation Layer
8.
Metadata Layer
9.
10.
Web server logs
with user browsing data.
11.
Internal market research
data.
12.
13.
- This does
not increase the size of the table, since new information is updated.
14.
- This allows
us to keep some part of history.
15.
Disadvantages:
16.
- Type 3
will not be able to keep all history where an attribute is changed more than once. For example, if Christina later moves to Texas on December 15, 2003, the California information will be lost.
17.
Usage:
18.
Type 3 is
rarely used in actual practice.
19.
When to use
Type 3:
20.
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