Abstract
In the design environment, the concurrency control mechanisms of conventional database systems are frequently clumsy and inadequate. In this paper, some unconventional concurrency control mechanisms, soft locks and version resolution, are described and evaluated. Both mechanisms require that certain classes of conflict be resolved by interaction of designers. This paper explains these mechanisms, constructs performance analysis models for them, and derives formulas for performance measures, such as throughput and percentage of transaction time spent for conflict resolution. The formulas are then numerically evaluated for a range of parameter values that are sensible within a design environment. Some graphs of results are presented to show the performance of the mechanisms. The mechanisms are shown to perform much better than conventional locking mechanisms within design environments.
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