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首页> 外文会议>East-European Conference on Advances in Databases and Information Systems Held Jointly With International Conference on Databases Systems for Advanced Applications, ADBIS-DASFAA 2000, Sep 5-9, 2000, Prague, Czech Republic >Flexible Integration of Optimistic and Pessimistic Concurrency Control in Mobile Environments
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Flexible Integration of Optimistic and Pessimistic Concurrency Control in Mobile Environments

机译：移动环境中乐观和悲观并发控制的灵活集成

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摘要

Limited execution capability, weak connections with the fixed network, frequent disconnections, and mobility dictate naturally an optimistic mode for transaction execution at mobile hosts (MH): the relevant computation is performed at MHs with cached data to provide quick response to the user, but the execution is validated against concurrent transactions and ACID properties maintained at the fixed network. Some of the proposals in the literature to reduce the likelihood of invalidation and thus increase the meaningfulncss of computation at MH are: (ⅰ) If the validation fails, the transaction could be re-executed and accepted even when the results differ from the original ones but within certain limits; (ⅱ) Validation/re-execution idea can be extended to several intermediate stages and the computation at MH adjusted with respect to changes in the database state at the fixed network. In this paper, we strengthen the computation at. MH further by facilitating partial guarantee against invalidation. This is accomplished by switching the computation to a pessimistic mode. Varying degrees of pessimism are provided. They balance the guarantee against its effect on other transactions' executions.
机译：有限的执行能力，与固定网络的弱连接，频繁的断开连接和移动性自然要求在移动主机（MH）上执行事务的乐观模式：在MH处使用缓存的数据执行相关计算，以向用户提供快速响应，但是对照并发交易和固定网络上维护的ACID属性验证执行情况。文献中的一些建议可以减少无效的可能性，从而增加MH处的有意义的计算。（ⅰ）如果验证失败，即使结果与原始结果不同，也可以重新执行并接受交易。但在一定范围内； （ⅱ）验证/重新执行的想法可以扩展到几个中间阶段，并且可以根据固定网络上数据库状态的变化调整MH处的计算。在本文中，我们加强了计算。 MH通过促进部分保证无效而进一步保证。这可以通过将计算切换到悲观模式来实现。提供了不同程度的悲观情绪。他们在保证对其他交易执行的影响之间取得平衡。

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