August 2017
Beginner to intermediate
426 pages
9h 36m
English
Content preview from Learning Informatica PowerCenter 10.x - Second Edition
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SCD2 - Date range
As you can see in the following table, we are maintaining the full history by adding new records to maintain the history of the previous records:
|
PM_PRIMARYKEY |
EMPLOYEE_ID |
NAME |
LOCATION |
PM_BEGIN_DATE |
PM_END_DATE |
|
100 |
1001 |
STEVE |
INDIA |
01-01-14 |
31-05-14 |
|
101 |
1001 |
STEVE |
USA |
01-06-14 |
99-99-9999 |
We add three new columns in the table: PM_PRIMARYKEY to handle the issues of duplicate records in the primary key in the EMPLOYEE_ID column, and PM_BEGIN_DATE and PM_END_DATE to understand the versions in the data.
The advantage of SCD2 is that you have complete history of the data, which is a must for data warehouse.
The disadvantage of SCD2 is that it consumes a lot of space.
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