Abstract

In this paper, we focus on aspects of an experimental distributed database system design intended for support of applications with limits on the response time for set requests. A set request is one in which several data items are needed but in no particular order. One application where set requests with specific response time requirements occur routinely is in Advanced Tactical Battle Management (ATBM). In the ATBM system transactions must be able to meet specific time constraints and deadlines. Standard concurrency control techniques in distributed database system designs involve blocking to control interference. Blocking transactions until concurrent updates complete can cause performance delays which are unacceptable. Queries may need to be answered immediately using available information and extrapolation techniques to compensate for missing values. To meet these needs, we have developed several nonblocking concurrency control methods.

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