Istituto di Scienza e Tecnologie dell'Informazione     
La Manna M., Simoncini L. An implementation of optimistic policy for concurrency control in a computer network for real-time applications. In: Microprocessing and Microprogramming, vol. 14 pp. 9 - 15. North-Holland, 1984.
In the field of real-time control systems, some attempts are in course to apply basic conceptrs of networking, data-base and transaction processing in order to provide a robust and efficient environment. This paper presents a simple implementation of a concurrency mechanism in a computer network for real-time applications. This mechanism insures data-base integrity and consistency and provides a better perfomance with respect to locking in particular situations. The proposed mechanism is based on te detenction of existing conflicts and their resolution before the beginning of the committing phase. Each transaction must verify its commit right before committing by performing a control on the statuses of shared objects. Fast transactions which update few objects are generally privileged over slow transaction which update many objects. Adding additional features to the basic mechanism, slow transactions are guaranteed to commit also in presence of concurrent fast transaction.
Subject Transaction Processing
Atomic Actions
Intention Lists
Optimistic Policy

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