Fig. 8.1.23 Sometimes there is a need for an operational data store (ODS).The ODS was a place where online high-performance processing could be done on
corporate data. Not every organization had need of an ODS, but many did.
At about the time that the data warehouse was born, it was recognized that organizations
had need of a place where individual departments could go to and find data for their own
individual analytic needs. Into this analytic environment came the data mart or the
dimensional model.
Fig. 8.1.24 shows the star join, the foundation of the data mart.
Chapter 8.1: A Brief History of Data Architecture