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This paper describes a multistep technique that can be applied to improve system structure and to improve performance when necessary. The technique begins with the analysis of system structure via the structured design guidelines of coupling and cohesion. Next, manual system structure improvement transformations am applied. The effect of the transformations on execution time is then determined. Finally, vertical migration is used on the restructured system to improve its performance. Using the results of this paper, system programmers can identify specific cases where both good system structure and good performance are attainable, and others where tradeoffs must be made. The technique is most applicable during the maintenance phase of the software life cycle. [ABSTRACT FROM AUTHOR]

This paper, presents a modified priority based probe algorithm for deadlock detection and resolution in distributed database systems. The original priority based probe algorithm was presented by Sinha and Natarajan based on work by Chandy, Misra, and Haas. Various examples are used to show that the original priority based algorithm either fails to detect deadlocks or reports deadlocks which do not exist in many situations. A modified algorithm which eliminates these problems is proposed. This algorithm has been tested through simulation and appears to be error free. Finally, the performance of the modified algorithm is briefly discussed. [ABSTRACT FROM AUTHOR]

Presents a correction to a publishing error in the paper "A Modified Priority Based Probe Algorithm for Distributed Deadlock Detection and Resolution," by Alok N. Choudhary et al.