通过对视图维护过程中的更新异常进行分析，发现并发更新是导致视图维护异常的主要原因。
Based on the analysis of view maintenance anomaly, the concurrent updates are found to be one of the main reasons that cause view maintenance anomaly.
本系统采用E -R图法进行规范化设计使得数据冗余最小，数据一致性好，更新异常问题不易发生。
This system used E-R chart method to design in order to minimum data redundancy and optimize data consistency and reduce updating abnormity.
关系数据库的世界是以防止错误为根基的；以正规化(normalization)为工具消除重复和防止更新异常。
Relational world is based on error prevention; and normalization is used as a tool to remove duplication and prevent update anomalies.
但是，对于系统的整体或者局部软件的维护，都非常的费时费力，且常常由于人为的疏忽导致更新异常，使得系统不能正常运行。
But it costs much more time and work to finish the holistic or partial maintenance, and a mistake may cause the system working abnormally.
XML保持语义下的冗余检测问题对于防止XML文档的更新异常和减少XML冗余信息的存储具有很大意义，是XML规范化理论的关键问题之一。
The problem of XML redundancy detection with semantics is very meaningful to prevent update anomalies and the key problem of XML normalization theory.
XML保持语义下的冗余检测问题对于防止XML文档的更新异常和减少XML冗余信息的存储具有很大意义，是XML规范化理论的关键问题之一。
The problem of XML redundancy detection with semantics is very meaningful to prevent update anomalies and the key problem of XML normalization theory.
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