Data marts are created to answer specific
business needs.
The data
is expressed as a star schema. At the center of the schema is a fact
table
containing measures or factual data about a business. To the fact
table are
linked in a star pattern the dimensions that reflect dimensions or
attributes
of a business. This topic is an overview of the data marts built
through the sample catalog.
The extract, transform, and load (ETL) builds deliver
data from the operational
data store area in the data warehouse to the data marts. Data marts
can be
configured to have access restrictions for specific groups of people.