分布式混合实时事务处理

为了提高分布式实时数据库系统事务处理的成功率和可靠性，将分布式实时事务进一步细化，对传统的事务接纳控制协议进一步改进，从而提出了一种含有真实时和非实时两部分的分布式混合实时事务接纳控制机制。定义了分布式混合实时事务模型及系统设计方案。分布式混合实时事务的接纳控制综合考虑分布混合事务的执行需求和价值，有效控制负载，减少被系统接纳执行后而又不能满足截止期的事务，提高分布式实时数据库系统事务处理的成功率和可靠性。通过重点分析混合实时事务的接纳控制模型，对混合实时事务的接纳控制与传统的接纳控制作了分析比较，说明了比传统的接纳控制协议更优。

Treatment Research of Hybrid Real- Time Transactions

In order to enhance transaction processing success and reliability of Distributed Real-time Database System,Distributed real-time transaction is more subdivided and traditional admission control protocol is more improved.Accordingly,a new admission control mechanism,for Distributed hybrid real-time transactions consisting of both genuine real-time and non-real-time parts(ACMDHRTT),is put forward in this paper.ACMDHRTT considers both the executing requirement and the value of hybrid real-time transactions.In order to maximize system profit,it reserves system resources and controls effectively system load,by reducing the number of transactions being accepted for execution but not able to come to its deadline.This paper emphasizes on analyzing ACMDHRTT model.It also compare ACMDHRTT with traditional admission control mechanism,which do not consider sub-transaction admission control,with the result that ACMDHRTT is more excellent than traditional admission control protocol.