Query driven simulation is an approach to simulation modeling and analysis that attempts to automate the storage and retrieval of simulation data and simulation models. Object-oriented database systems provide sufficient data and behavioral structuring mechanisms to support demanding applications like query driven simulation. This paper represents a preliminary modeling study of some of the design choices related to the operation of active objects in an object-oriented database system. The authors select a collection of database and simulation protocols that will support a highly concurrent, high performance query driven simulation system. >