[
From SQL Server Magazine]
The Performance Data Warehouse (PDW) isn't a new idea; however, it's rarely implemented. A PDW is the idea or concept of applying business intelligence (BI) solution architectures to a DBAs informational requirements. A DBA needs information, such as query statistics, server activity, and disk usage that's relevant to his or her database systems.
The article continues at
http://www.sqlmag.com/Articles/Index.cfm?ArticleID=99420