通过元数据镜像生成冗余副本，保证了元数据的可靠性；
The reliability of metadata is guaranteed by the redundant copies which are generated by metadata mirroring.
在分析关系数据库中MARC数据存储特点的基础上，给出一种MARC数据镜像系统的设计方案。
On the basis of analyzing the characteristic of the MARC data stored in the relation database, this paper proposes a kind of designing scheme of a MARC data mirror system.
在水库洪水调度系统等数据库应用软件的开发过程中，存在数据镜像、汇总、备份等实时主动的数据处理需求。
In the development of the reservoir flood control system software, there are many requirements about real active data processing, such as data mirroring, summation and coping.
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