...务计算；嵌套事务模型 [gap=1701]Key words：databases；concurrency control；service computation；nested transaction model ...
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Trigger execution models include Multiple tigger model and nested transaction model.
触发器的执行模型包括多触发器模型和嵌套事务模型。
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触发器的执行模型包括多触发器模型和嵌套事务模型。
Trigger execution models include Multiple tigger model and nested transaction model.
本文分析了PDM中设计事务的特点，研究了PDM的嵌套事务模型以提高两段锁系统的并发性。
This paper analyzes the property of PDM and a nested transaction model which can improve concurrency of two phase locking mechanism.
首先，通过分析移动分布环境中实时事务的特点给出了一个基于功能替代的移动实时嵌套事务模型。
First, a nested transaction model based on functional alterative tasks is given by analyzing the characteristics of real-time transactions in mobile distributed environment.
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