多级实时数据库的安全性策略

实时数据库根本目标就是使满足截止时间的事物数量为最大，因而，管理和支持优先考虑时间的事务处理是非常重要的。然而，随着实时计算的迅速发展，安全成了许多实时应用另一个必须考虑的问题。因此，在多级实时数据库系统中，提出一种结合实时性和安全性的方法是非常必要的。本文陈述了实时系统设计者应该考虑的实时性和安全性，描述了一种规范语言允许设计者在适当的级别设定数据库的重要属性以支持部分安全并探讨了一种自适应方法以达此目的。

SECURITY POLICY OF MULTILEVEL REAL-TIME DATABASES

The decisive performance objective of real-time database systems is maximized the number of the transactions that complete before their deadlines,then management and transaction processing for real-time systems are essential in supporting time-critical applications.However,as real-time systems continue to evolve,security is another problem must be considered in many real-time application.So it is clear that an approach must be presented to support both timeliness and security of multilevel real-time database systems.This paper address issues that systems designer of real-time systems should consider for supporting both requirements of timeliness and security,also describe a specification language that allow the designer to specify important property of the database at an appropriate level to support partial security and demonstrate an adaptive policy to achieve it.