Earlier in my blog, Slowly Changing Dimensions – Special Attention Needed, I touched upon the need to pay special attention to slowly changing dimensions. Organizations have three variants of implementing solutions for slowly changing dimensions.

Type 1: in these implementations, the latest data is retained. This is implemented when there would be no need to do historic analysis. For example, an online transactional system that needs to display the latest list of values in the pull-down pick lists may use this type.

Type 2: in these implementations the history or the validity period for the changes is persisted.