Fig. 8.1.22 Transforming application data to corporate data.The data warehouse provided the organization with the “single version of the truth.”
Now, there was a basis for reconciliation of data. With the data warehouse—for the first
time—came a place where historical data could be stored and used. The data warehouse
represented a fundamental step forward for the information processing systems of the
organization.
As important as the data warehouse was, there were other elements of architecture that
were needed. It was soon recognized that something between a data warehouse and a
transactional system was needed. Thus, born was the ODS or operational data store.
Fig. 8.1.23 shows the ODS.
Chapter 8.1: A Brief History of Data Architecture