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The key objective of this project is to design and implement a distributed database management system called SDD-1 (System for Distributed Databases). SDD-1 is being designed as a cooperating set of processors called datamodules. Each datamodule stores a portion of the database and a given data item may be stored redundantly at several datamodules. A user accessing SDD-1 at any datamodule can retrieve or update data stored anywhere in the network. In fact, the user need not be aware of the distribution at all. A database system with this distributed architecture is important for command and control because it supports access to an integrated database while offering the following key operational advantages: Reliability/survivability; Tunable efficiency; and Modular upward scaling.