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针对偏斜数据广播系统,提出两层移动实时事务模型,允许把移动实时事务分解为多个事务帧,以便以帧为粒度更精细地管理移动实时事务操作的并发执行.提出可动态调整帧串行化顺序的并发控制协议BCCDSS,避免不必要的帧夭折,尽可能早地在移动客户机端检测帧数据冲突,并减少须夭折的帧操作,让须夭折的移动事务帧尽早夭折,从而大大提高移动实时事务处理效率.对BCC-DSS协议的性能进行了评价,结果表明BCC-DSS协议能显著改进无线移动实时事务的平均响应时间、重启率和超期率.
Aiming at skewed data broadcasting system, a two-layer mobile real-time transaction model is proposed, which can resolve mobile real-time transaction into multiple transaction frames so as to manage the concurrent execution of mobile real-time transaction operations more granularly with frame granularity. The concurrency-based concurrency control protocol, BCCDSS, avoids unnecessary frame premature death detection of frame data collisions at the mobile client as early as possible and reduces the number of frame operations that need to be aborted, resulting in the premature death of moving frame frames that must be aborted Improve the efficiency of mobile real-time transaction.The performance of BCC-DSS protocol was evaluated and the results show that BCC-DSS protocol can significantly improve the average response time, restart rate and overrun rate of wireless mobile real-time transactions.