Observations on optimistic concurrency control schemes
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In data broadcast environments, the limited bandwidth of the upstream communication channel from the mobile clients to the server bars the application of conventional concurrency control protocols. In this paper, we propose a new variant of the optimistic concurrency control protocol that is suitable for the broadcast environments. In this protocol, read-only mobile transactions can be processed locally at the mobile clients. Only update transactions are sent to the server for final validation. These update transactions will have a better chance of commitment because they have gone through partial validation at the mobile clients. This protocol, while using less control information to process transactions at the mobile clients, provides autonomy between the mobile clients and the server with minimum upstream communication, which are desirable features to the scalability of applications running in broadcast environments.