The reliability of data base system is its important function guideline. Data base fault tolerance and breakdown recover are the necessary function in large data base.

数据库系统的可靠性是数据库系统的重要性能指标，数据库容错和故障恢复是大型数据库必备的功能。

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This paper introduces the design, realization and application of the first national large industry data base system in China, which is now being operated.

木文介绍中国第一个大型全国性工业数据库系统的设计、实现和应用。本系统已经运行、使用。

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But as to the large of knowledge data base, it becomes more and more difficult for the organization and management of knowledge, so the reasoning efficiency of the system is also lower.

但具有大规模规则库的产生式系统，其知识的组织与管理越来越困难，推理效率也越低。

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With a great data system and assessments in place along with a large user base, the platform will be able to start to do A-B testing between different videos to be able to personalize learning for each student.

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