4dcbfdca____Alan_Whitehouse_s_Ramblings__Description_Usage
[Component Item] Column Store [Link] Link [Description/Usage] 
Relational databases traditionally store data in rows on a data page. In a column store, values from a single column, coming from multiple rows are stored together in a compressed form providing better performance. Often used for large data warehouses.
The Microsoft Business Intelligence Stack Cheat Sheet « Alan Whitehouse's Ramblings
Description/Usage