Douglas W. Cornell

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In a relational database environment, transaction response time is likely to be affected by the time required to read the necessary data from secondary storage (disk). In cases where segment scans are used to a significant extent, vertical partitioning of the relation can result in a decrease in the number of disk accesses. The issue is how to set up the(More)
In a multisystem database system with a function request shipping approach, the databases are partitioned among the multiple systems and a facility is provided to support the shipping of database requests among the systems. This is in contrast to a data sharing multisystem approach in which all systems have direct access to the shared database. The(More)
The rapid growth in the transaction rate requirement of high volume database systems has forced users and vendors to (a) couple multiple database systems to run against a common database, and (b) to implement each single system with faster processors. Multiple system coupling incurs performance degradation due to inter-system interference: inter-system(More)
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)