A two-version approach for real-time concurrency control and recovery

This paper proposes an integrated mechanism for concurrency control and recovery in real-time databases. A two-version approach is used to adjust the serializability of schedules in favor of higher-priority transactions, and, at the same time, to provide a consistent database image at client sites for local processing of read-only transactions. When the database crashes, a consistent database image is used, in return, to efficiently and predictably recover the database from failure. A two-version network-server-based architecture is proposed to support a diskless run-time logging mechanism and an effective write-through procedure.