Redesign of Optimistic Methods : Improving Performance and Applicability

Unland, Rainer GND; Schlageter, Gunter GND; Prädel, Ulrich

The original approach of optimistic concurrency control /2/ has some serious weaknesses with respect to validation, long transactions and starvation. This paper first discusses design alternatives which avoid these disadvantages. Essential improvements can be reached by a new validation scheme which is called snapshot validation. The paper then discusses a validation scheme which especially supports read transactions, so that the number of backups decreases substantially. Finally a very simple solution for the starvation problem is presented. The proposal is perfectly consistent with the underlying optimistic approach.

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Unland, Rainer / Schlageter, Gunter / Prädel, Ulrich: Redesign of Optimistic Methods. Improving Performance and Applicability. Hagen 1986. FernUniversität in Hagen.

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