Abstract
Database sharing (DB-sharing) refers to a loosely or closely coupled multiprocessor architecture where all processors share a common database at the disk level. Such systems primarily aim at high availability and high performance demanded by large applications in online transaction processing. To achieve these goals a synchronization technique is required that efficiently coordinates the processors’ database accesses and that also works properly after a processor crash. The described primary copy algorithm seems to be a good candidate to meet these requirements since it permits flexible adaption to changing working conditions. Besides of the basic protocol we specify the recovery actions after a processor crash. Mechanisms are proposed that allow to continue synchronization after a crash with little interference to transaction processing. Furthermore, the required redundancy is provided with nearly no extra costs during normal operation.
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Rahm, E. (1987). A Reliable and Efficient Synchronization Protocol for Database Sharing Systems. In: Belli, F., Görke, W. (eds) Fehlertolerierende Rechensysteme / Fault-Tolerant Computing Systems. Informatik-Fachberichte, vol 147. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-45628-2_30
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DOI: https://doi.org/10.1007/978-3-642-45628-2_30
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