调整优化数据库，删除多余数据。
为使应用程序高效运行，您不希望它携带多余数据——应用程序不需要的数据。
To enable your application to run efficiently, you do not want it to carry around excessive data - data that your application does not need.
利用该算法，通过预处理、数据约减等步骤从商场营销数据库中收集顾客属性数据，消去多余数据属性。
Using the algorithm, system can collect customers' attributes data and eliminate redundant data attributes from emporium marketing database by pretreatment, data reduction and other steps.
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