【摘要】 本文讨论了支持实时主动数据库系统的触发器机制，包括触发器的概念、结构与说明及其监视与执行模型．该触发器机制统一了实时应用所要求的定时及其他限制／条件和数据库完整性／一致性限制，统一了它们的语义表示与监视处理，从而大力支持了系统的主动和实时特性更多还原

【Abstract】 This paper presents a trigger mechanism in a real time active database system, including the concepts,structures and specifications, and the monitoring and execution model of triggers This trigger mechanism unifies the semantics and the monitoring of timing and other constraints/conditions required by real time applications and database integrity /consistency constraints And therefore it supports strongly the active and real time properties of the system更多还原