更新异常(Update Anomaly):如果更改表所对应的某 个实体实例或者关系实例的单个属性时,需要将 多行更新,那么就说这个表存在更新异常。
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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.
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