摘要
数据存储设计会直接影响数据的存取效率、系统实现效率和系统的运行效率。以关系模型为例,一般认为数据存储设计达到第三范式就可以了,但同是第三范式关系的不同方案仍然有存储空间的使用、检索效率的巨大差异,所以必须深入考虑第三范式条件下系统中数据存储设计的问题。并通过对几种第三范式设计方案的对比分析,给出优化设计的计算公式。
The data storage design can affect directly the data deposit and withdrawal efficiency,the system realization efficiency and the system operating efficiency.Take the relational model as an example.Generally,it will do that the data storage design can achieve the third normal form.However,different plans of the third normal form relations still have the problems such as the use of storage space and the difference of the retrieval efficiency.So it is worthy to have a deep study of data storage design in the system under the third normal form conditions.And by contrast and analysis of the third normal form the optismum design is given.
出处
《学术问题研究》
2007年第2期44-48,共5页
Academic Research(Integrated Edition)