本文将详细介绍分布式事务、并发控制和资源请求模型，总结出分布式数据库系统的通用死锁条件。
In this paper, distirbuted transaction, concurrency control and resource request model are introduced in detail. The universal deadlock condition in distirbuted database system is summarized.
基于XML的通用的报表引擎，可用在因特网环境中远程生成各式各样灵活的、专业的企业报表，整个报表引擎也是数据库系统的一个关键部分。
An XML-based generic report engine, which can be used to generate various kinds of enterprise reports on the web, is the key of a whole enterprise system.
利用这些规则对数据库系统返回给普通用户的数据动态地做最小修改，防止推理通道的产生。
According to these relations, rules of inference control are generated and used to modify the data queried by generic users dynamically and most parsimonious ly so as to eliminate inference channels.
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