A recent release of Qlikview [www.qlikview.com] added a new feature called "Direct Discovery" [http://bi-review.blogspot.co.uk/2013/04/first-look-at-qlikview-direct-discovery.html] ,  that allows Qlikview reports to directly access a database datasource on-demand . Qlikview, by default, loads all required data up-front into its own in-memory column-store