2012•Computer and ModernizationRequires access

Research on Concurrent Control of Multiversion of Real-time Database in NCS

Wen Xing-xian

Abstract

The real-time database is an important part of NCS system,and it is the data exchange platform of whole control system.Based on the original two phase locking mechanism,the paper puts forward a kind of concurrency control method to apply to multiversion.Adverse effect brought by multiversion for field control is introduced.Analysis is made for on-site transaction serializability on data multiple versions of the cases,and multiversion concurrency control protocols(MV2PL) are used to solve the problem of multiversion concurrency control.The simplified version concurrency protocol(2V2PL) is used to show its correctness,the last example shows that the protocol is feasible.

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Key concepts: Computer science, Serializability, Multiversion concurrency control, Concurrency control, Two-phase locking, Distributed concurrency control, Isolation (microbiology), Optimistic concurrency control