Overview of Concurrency Control in Real-time Database Systems

Real-time database system derives its concurrency control mechanisms from traditional ones and results of real-time systems.Classifying real-time concurrency control protocols as either conservative(e.g.,locked-based) or optimistic concurrency control protocols,the research analyses mechanisms of the basic 2PL protocol and the OCC protocol as well as 2PL-HP protocol and the PCP protocol which derive from 2PL protocol and the OCC-BC and the WAIT-50 those extend the OCC protocol.Keeping focus on resent work of RTDB systems makes it clear that protocols mixed with the two types or extended from one become more and more popular.The famous RCP protocol and the OCC-DA protocol both get excellent performance in practice.