Because this is a topic that interests me I have done some digging.
MonetDB <http://www.monetdb.com/Home>is a proper column-store DBMS. It is used on some decent sized projects, several of which are EU-funded.
Digging a bit deeper I have discovered that a PostgreSQL Foreign Data Wrapper for MonetDB has been created - monetdb_fdw.
The fdw is written up here <http://pgsnaga.blogspot.co.uk/2013/07/monetdbfdw-postgresql-meets-column.html>
There is a video that shows what happens when a query is executed in PostgreSQL and MonetDB
The video shows an analytical query being processed 1. Using PostgreSQL - 177 seconds 2. Using MonetDB - 8 seconds 3. Using a remote MonetDB server through MonetDB FDW - 1 second I think its worth investigating further Robin St.Clair
