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Lock Downgrading: An Approach to Increase Inter-transaction Parallelism in Advanced Database Applications

机译:锁降级:一种提高高级数据库应用程序中事务交互并行性的方法

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In this paper, we propose a concurrency control protocol, denoted Cooperative Locking, which extends the two-phase locking protocol by introducing the notion of downgrading of locks proposed in [9]. The basic idea of the proposed protocol is to provide the following functionality: after using an object in a transaction, the user can downgrade a lock on an object to a less restrictive mode before the transaction ends its execution. The prime goal of our proposal is to provide a high degree of inter-transaction parallelism while ensuring serializability of schedules.
机译:在本文中,我们提出了一种并发控制协议,称为协作锁定,它通过引入[9]中提出的锁降级的概念扩展了两阶段锁定协议。提议的协议的基本思想是提供以下功能:在事务中使用对象之后,用户可以在事务结束执行之前将对象上的锁降级为限制较少的模式。我们建议的主要目标是在确保时间表的可序列化性的同时,提供高度的事务间并行性。

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