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Concurrency Control of Real-Time Transactions with Disconnections in Mobile Computing Environment

机译:移动计算环境中具有断开连接的实时事务的并发控制

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In mobile real-time databases systems, the objects of concurrency control should take saving system resources and supporting disconnection into consideration, besides ensuring database consistency, reducing the number of expired transactions and avoiding "priority inversion". In the paper, a nested transaction model for mobile real-time transactions is discussed first. Then a divergence control lock model based on prudent ordered sharing and a Check-Out/Check-In protocol supporting disconnections are given. DC/POS-PAI-2PL is a two-phase lock strategy integrating these methods for mobile real-time transactions. The performances of DC/POS-PAI-2PL are d analyzed in the end. It is shown that the suggested transaction model and DC/POS-PAI-2PL can improve system performances.
机译:在移动实时数据库系统中,并发控制的对象除了确保数据库的一致性,减少过期事务的数量并避免“优先级倒置”之外,还应考虑节省系统资源和支持断开连接。在本文中,首先讨论了用于移动实时交易的嵌套交易模型。然后给出了基于谨慎有序共享的发散控制锁模型和支持断开连接的签出/签入协议。 DC / POS-PAI-2PL是一种两阶段锁定策略,将这些方法集成在一起用于移动实时交易。最后对DC / POS-PAI-2PL的性能进行了分析。结果表明,建议的事务处理模型和DC / POS-PAI-2PL可以提高系统性能。

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