Fig. 15.1.8 The system of record changes location as data ages.

In the application environment are found the current value data. In current value data,
data are accurate as of the moment of access. Only a limited amount of history is found
in the application environment.

In the data warehouse are found early historic data. For most organizations, early historic
data are data that are from 1 to 5 years old.

In the data mart environment is found departmental customized system of record data. In
the departmental customized data are found data that are customized for each
department, such as marketing, sales, and finance.

In the big data environment are found deep historic data. Deep historic data are system of
record data that is 6 years and older data.

A Simple Example

Chapter 15.1: The System of Record