Linked Dimension: This dimension joins different fact tables from two or more cubes
Conformed Dimension: This dimension joins multiple fact tables with in a cube
Tuesday, January 18, 2011
What is Self-referencing dimensions?
This occurs when a dimension references itself by a primary and a foreign-key relationship in the same dimension.
Example: Dim_A -> Dim_A
Example: Dim_A -> Dim_A
Friday, January 14, 2011
What is Fact Dimension?
Sometimes we need to analyze our data based on the some specific value which are available only at fact table. In this case, the particular data will act as a dimension. This dimension is called as Fact Dimension.
Fact Dimension also known as Degenerated Dimension
Fact Dimension will be more helpful, when we need to categorize the data based on similar kinds of data.
Example: Invoice Number, Purchase Order No, Etc.,
Of course, we can maintain separate dimension table instead of using Fact Dimensions, but no benefit, because the dimension table grow in the same ratio of fact table growth. So by creating Fact dimension, we can avoid duplicate data and reducing memory consumption. Also it helps to improve the performance during data retrieval time.
Fact Dimension also known as Degenerated Dimension
Fact Dimension will be more helpful, when we need to categorize the data based on similar kinds of data.
Example: Invoice Number, Purchase Order No, Etc.,
Of course, we can maintain separate dimension table instead of using Fact Dimensions, but no benefit, because the dimension table grow in the same ratio of fact table growth. So by creating Fact dimension, we can avoid duplicate data and reducing memory consumption. Also it helps to improve the performance during data retrieval time.
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