Dimension Types
This feature is available in Enterprise and Ultimate editions.
Type 1
In a Type 1 dimension, each row in the table contains the latest information from the operational system.
| Key | BusinessKey | Name |
| 1 | 1 | Foo |
If the asset identified with BusinessKey 1 changed names in the operational system, the data mart loader would update the existing row in the dimension with the new name. The previous name is not retained.
| Key | BusinessKey | Name |
| 1 | 1 | New Name |
Type 2
In a Type 2 dimension, a new row is inserted into the table when data changes in the operational system.
| Key | BusinessKey | Name | Version |
| 1 | 1 | Foo | (Null) |
If the asset identified with BusinessKey 1 changed names in the operational system, the data mart loader would add a new row to this dimension with the new name. The previous row remains the same.
| Key | BusinessKey | Name | Version |
| 1 | 1 | Foo | 0 |
| 2 | 1 | New Name | 1 |
Type 3
In a Type 3 dimension, a separate column is used to represents old values.
| Key | BusinessKey | Name | Old_Name |
| 1 | 1 | Foo | (Null) |
If the asset identified with BusinessKey 1 changed names in the operational system, the data mart loader would update the existing row in the dimension with the new name. The old name is moved to a separate column and the Name column holds the current name
| Key | BusinessKey | Name | Old_Name |
| 1 | 1 | New Name | Foo |