Abstract : the data redundant in relational database is caused by the reduplication of the table , attribute , record , or attribute value 文摘:关系数据库的数据冗余形成的原因有表的重复、属性的重复、元组的重复、属性值的重复。
The thesis thoroughly discusses the design and optimization of dbms and file system , integrality and consistence of the data and data redundancy 文中对数据库与文件系统的设计与优化、数据的完整性与一致性、数据冗余的处理等问题作了详细的论述。
The redundancy resulting from maintaining multiple copies of the same data is crucial during planned and unplanned system maintenance . for more information , see 执行计划系统维护和非计划系统维护期间,应为同一数据维护多个副本以实现数据冗余,这一点至关重要。
Neither one is technically a form of raid at all , since raid stands for " redundant array of inexpensive disks " , and raid - 0 and linear mode don t provide any kind of data redundancy 从技术上讲,二者都不是raid ,因为raid代表“廉价磁盘冗余阵列” ,而raid - 0和线性模式都不提供任何类型的数据冗余。
The replicate of the limited class attribute value may result from the relation of one - to - one or one - to - many but the occasional replicate of the unlimited class attribute value is not data redundancy 无限类属性值偶尔重复不是数据冗余,有限类属性值的重复由一对多或多对多的关系所致,可相机处理之。