本文从并行数据库系统的体系结构、并行数据库的查询，聚集，排序及数据可靠性等方面入手，阐述了对并行数据库的认识和看法。
This paper discusses the understanding on the parallel database from the architecture of parallel database systems, parallel database query, aggregation, sorting, and data reliability.
指出了在桥梁CAD中采用数据库技术的必要性，叙述了以核心数据库系统为支撑的桥梁CAD系统的组成和体系结构。
This paper discusses the necessity of applying Database System to Bridge CAD. The constitution and system architecture of bridge CAD based on core database system has been studied.
由于分布式数据库系统不能满足PK I安全体系结构的要求，我们采用目录服务技术来为其实现证书、证书作废列表的存储管理。
Because the DBS cannot meet the requirement of PKI, we use the Directory Service technology to implement the administration of Certificate and Certificate Revocation List for PKI system.
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