MIRROR swMATH ID: 2280 Software Authors: Xiong, Ming; Ramamritham, Krithi; Haritsa, Jayant R.; Stankovic, John A. Description: MIRROR: A state-conscious concurrency control protocol for replicated real-time databases. Data replication can help database systems meet the stringent temporal constraints of current real-time applications, especially Web-based directory and electronic commerce services. A prerequisite for realizing the benefits of replication, however, is the development of high-performance concurrency control mechanisms. In this paper, we present Managing Isolation in Replicated Real-time Object Repositories (MIRROR), a concurrency control protocol specifically designed for firm-deadline applications operating on replicated real-time databases. MIRROR augments the classical O2PL concurrency control protocol with a novel state-based real-time conflict resolution mechanism. In this scheme, the choice of conflict resolution method is a dynamic function of the states of the distributed transactions involved in the conflict. A feature of the design is that acquiring the state knowledge does not require inter-site communication or synchronization, nor does it require modifications to the two-phase commit protocol. Using a detailed simulation model, we compare MIRROR’s performance against the real-time versions of a representative set of classical replica concurrency control protocols for a range of transaction workloads and system configurations. Our performance studies show that (a) the relative performance characteristics of these protocols in the real-time environment can be significantly different from their performance in a traditional (non-real-time) database system, (b) MIRROR provides the best performance in both fully and partially replicated environments for real-time applications with low to moderate update frequencies, and (c) MIRROR’s simple to implement conflict resolution mechanism works almost as well as more sophisticated strategies. Homepage: http://www.sciencedirect.com/science/article/pii/S0306437901000539 Keywords: optimistic concurrency control; data replication; concurrency control; MIRROR Related Software: SimDVS Cited in: 3 Publications Standard Articles 1 Publication describing the Software, including 1 Publication in zbMATH Year MIRROR: A state-conscious concurrency control protocol for replicated real-time databases. Zbl 1015.68065Xiong, Ming; Ramamritham, Krithi; Haritsa, Jayant R.; Stankovic, John A. 2002 all top 5 Cited by 8 Authors 1 Haritsa, Jayant R. 1 Lee, Insup 1 Leung, Joseph Y.-T. 1 Pandey, Sarvesh 1 Ramamritham, Krithi 1 Shanker, Udai 1 Stankovic, John A. 1 Xiong, Ming Cited in 3 Serials 1 Information Systems 1 Computer Science Review 1 Chapman & Hall/CRC Computer and Information Science Series Cited in 1 Field 3 Computer science (68-XX) Citations by Year