A nifty feature (a very important logical layer) is provided
with SQL Server 2005, and later versions, is the UDM (Unified Dimensional
Model).
The UDM is used by the AS to access the underlying data to
create OLAP cubes and data mining models. This model combines the best of the
features of Relational and Dimensional models. The UDM will be explained
through examples in the future articles.