A multilevel real-time database system must have security constrains in addition to timing constrains.

一个多级安全实时数据库系统不仅需要有安全限制，同时也要有时间约束。

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This paper suggests a trigger mechanism supporting advanced application in active real-time database system.

提出了一种支持现代应用的主动实时数据库系统的触发器机制。

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And nowadays, in the industrial field, real-time database system is being used more and more, so it is so valuable to study and apply it.

并且，现今实时数据库体系在工业范畴得到了越来越普遍的应用，所以它具有主要的研讨和适用价值。

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The prototype system can match prints taken in custody suites with those in the database 85% of the time, said Professor Allinson.

BBC: NEWS | Technology | Shoeprint analysis to fight crime