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Scheduling issues in multimedia query optimization

This paper examines the scheduling of concurrent requests on multimedia storage servers consisting of multiple resources, which is a central issue in processing and optimization of complex queries in multimedia database systems [Chaudhuri 1994]. It introduces a formal model for the demands imposed by multimedia requests on the server resources, described a heuristic algorithm for scheduling the requests that is based on the formal model, and presents a formal result that bounds the performance of the schedule produced by the algorithm compared to the optimal schedule. Scheduling requests that involve continuous media data types, for example, audio and video objects, is a challenging problem due to the following distinguishing characteristics of multimedia environments: