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Embedded Real-time Database System Concurrency Control Protocol AC-Based OCC-FV

机译：嵌入式实时数据库系统并发控制协议基于AC的OCC-FV

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摘要

Alternative and compensation are not only two basic characteristics of the real-time transaction but also the body of the concurrency control. At the same time, new problems are brought. AC-Based OCC-FV protocol associates alternative and compensation with optimistic concurrency control protocol OCC-FV. For each transaction in accepted queue, an alternative which causes no conflict can be chosen to join the ready queue as soon as possible. This is just a kind of ideal circumstance. If the conflict is inevitable, it is necessary to choose a suitable alternative to join the concurrency control, but also ensures the system to be in a safe state when conflicts take place. In conflict resolution, the optimistic concurrency control protocol OCC-FV is extended in combination with the compensation characteristic, when the transaction failed, immediate dispatch of corresponding compensation transactions is taken to prevent the system from disaster.
机译：替代和补偿不仅是实时交易的两个基本特征，而且是并发控制的主体。同时，带来了新的问题。基于交流的OCC-FV协议将替代和补偿与乐观的并发控制协议OCC-FV相关联。对于接受队列中的每项事务，可以选择导致任何不冲突的替代方法以尽快加入就绪队列。这只是一种理想情况。如果冲突是不可避免的，有必要选择合适的替代方案来加入并发控制，而且还可以确保在冲突发生冲突时处于安全状态。在冲突解决中，乐观的并发控制协议OCC-FV与补偿特性结合延伸，当事务失败时，采取立即调度相应的补偿事务以防止系统免于灾难。

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