【摘要】 本文提出了一种新的基于资源预报的并发控制机制,该机制充分考虑了实时事务的功能替代性,将并发控制分为替代级控制和事务级控制,允许多个替代并发执行。每个替代代表一条执行路径,只要其中一个替代成功则该实时事务可以提交;一个替代夭折,不表示该事务夭折,甚至并发执行的所有替代夭折,也不一定表示该实时事务夭折,该事务有可能会从另外的替代重启,这就大大提高了实时事务的成功率,降低了由于硬实时事务超过截止期对系统带来损失的可能性。更多还原

【Abstract】 In this paper,multi-class concurrency control based on resource prediction is discussed.This mechanism considers function alternative of real-time transaction,it divides concurrency control to alternative control and transaction control,also,multi-alternative is allowed to concurrency execute.Every alternative expresses an executed route,.If only an alternative is succeed,then the real-time transaction can be put in.But an alternative is aborted,indeed all the concurrency executed alternatives are aborted,the real-time transaction isn’t aborted.It may start up other alternatives.This mechanism advances the real-time transaction success rate and depresses feasibility of system loss due to hard real-time transaction exceeds the deadline.更多还原