This model decomposes a nested relational schema into a set of atomic schemas, each of them constitutes of a primary key or a primary key plus a non-primary attribute.
此模型将复杂的嵌套关系模式分解为由主键或主键和一个非主属性构成的原子模式集合。
The system determines whether it needs establishing and reserving the non-primary index by the classification of the attribute.
系统依据属性的类型决定是否要基于此属性创建非主键索引、是否要保存此非主键索引。
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