Well... i dont need the historical data too be that fast, so it can reside whereever SQL puts it. But i do need the Database holding Realtime data to be as fast as possible. And the point of their idea was to keep Database2 (Realtime only) in RAM and keep it small enough to fit in there easily, and as it will be very active it will stay in their the whole time. So I figure i could move all the old realtime data into the Historical Database (Database1).

I like the idea, but not sure about the pros/cons?