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<p><b>Abstract</b>—While there has been a significant amount of research in real-time concurrency control, little work has been done in logging and recovery for real-time databases. This paper proposes a two-version approach which considers both real-time concurrency control and recovery. We propose a network-server-based architecture and algorithms which can not only reduce the blocking time of higher-priority transactions and improve the response time of client-side read-only transactions, but also provide a diskless runtime logging mechanism and an efficient and predictable recovery procedure. The performance of the algorithms was verified by a series of simulation experiments by comparing the algorithms with the well-known Priority Ceiling Protocol (PCP), the Read/Write PCP, the New PCP, and the 2-version two-phase locking protocol, for which we have very encouraging results. The schedulability of higher-priority transactions and the response time of client-side read-only transactions were all greatly improved.</p>
Real-time database, concurrency control, recovery, read-only transactions, client/server databases, logging, write through procedure.

T. Kuo, C. Kuo and Y. Kao, "Two-Version Based Concurrency Control and Recovery in Real-Time Client/Server Databases," in IEEE Transactions on Computers, vol. 52, no. , pp. 506-524, 2003.
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