移动数据库中数据更新与广播的并发控制

Concurrency Control for Update Transactions and Broadcast of Data Items in Mobile Database

移动数据库系统中数据更新与数据广播并发处理,导致移动客户读取的数据可能不一致,本文分析了在移动数据库中数据更新与数据广播并发处理中可能出现的三类数据冲突,并提出了基于UFBL0原则的并发控制策略来解决上述的问题。该策略具有较好的独立性,对服务器和移动客户机的影响都较小,并且可以较大限度地提高广播给用户的数据项当前性。

The concurrent execution of update transactions and broadcast of data items in mobile database may result in mobile clients access inconsistency of data values.This paper analyzes three kinds of the data conflict in concurrent execution transactions and proposes the strategy to control the data conflict based on UFBLO rule. This strategy has the good independence, which the impact to the severs and the mobile clients is smaller, and the consistency of data values that are broadcasted to users is increased in larger extent.