Douglas W. Cornell

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The performance of multiple systems sharing a common data base is analyzed for an architecture with concurrency control using a centralized lock engine. The workload is based on traces from large mainframe systems running IBM's IMS database management system. Based on IMS lock traces the lock contention probability and data base buffer invalidation effect(More)
In a multi-query environment, the marginal utilities of allocating additional buffer to the various queries can be vastly different. 'nae conventional approach examines each query in isolation to determine the optimal access plan and the corresponding locality set. This can lead to performance that is far from optimal. As each query can have different(More)