Big Business Server lists Memory and System Resource settings under Preferences in the Server's Edit menu.
This Solution describes setting the memory usage for Server. (5508)
Big Business Server for Windows lets you assign memory settings by choosing Preferences from the Edit menu and clicking on Database, Data Management.
The default Cache setting is dynamic (Adaptive) meaning it will take some portion of available memory up to the specified Maximum Size. To change the Cache used, change the Maximum Size (to 128 for a small Data File, or 1024 for a very large one).