Concurrency control and recovery in database systems
Concurrency control and recovery in database systems
MPEG: a video compression standard for multimedia applications
Communications of the ACM - Special issue on digital multimedia systems
A quality of service architecture
ACM SIGCOMM Computer Communication Review
Time, clocks, and the ordering of events in a distributed system
Communications of the ACM
Quality-Based Flexibility in Distributed Objects
ISORC '98 Proceedings of the The 1st IEEE International Symposium on Object-Oriented Real-Time Distributed Computing
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It is critical for applications to obtain enough quality of service (QoS) from multimedia objects. Not only states but also QoS of objects are changed by methods. The objects are manipulated by multiple transactions. Here, the objects are required to be consistent. We discuss new types of consistency of multimedia objects with respect to QoS. Since it takes a longer time to perform a method on multimedia objects, the throughput of the system is decreased if objects are exclusively locked in traditional concurrently control. We separate a concurrency control mechanism to two orthogonal ones, one for serializing transactions and the other for mutually exclusive access to objects. The timestamp ordering protocol is adopted for the former one and the locking protocol for the latter.