Confirm dimension: It is the dimension that is sharable across the multiple facts or data model. This is also called Role Playing Dimensions.
Junk dimension: A number of very small dimensions might be lumped (a small irregularly shaped) together to form a single dimension, a junk dimension â€“ the attributes are not closely related. Grouping Random flags and text Attributes in a dimension and moving them to a separate sub dimension is known as the junk dimension.
Degenerated dimension: In this degenerate dimension contains their values in the fact table and the dimension is not available in the dimension table. Degenerated Dimension is a dimension key without a corresponding dimension.
Example: In the PointOfSale Transaction Fact table, we have:
Date Key (FK), Product Key (FK), Store Key (FK), Promotion Key (FP), and POS Transaction Number
Date Dimension corresponds to Date Key, Production Dimension corresponds to Production Key. In a traditional parent-child database, POS Transactional Number would be the key to the transaction header record that contains all the info valid for the transaction as a whole, such as the transaction date and store identifier. But in this dimensional model, we have already extracted this info into other dimensions. Therefore, POS Transaction Number looks like a dimension key in the fact table but does not have the corresponding dimension table.
Posted Date:- 2021-09-28 07:43:05
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