Amelioration method of SNM based on flexible window and ranking adjusting

This paper introduced the basic SNM and analyzed its deficiency,and put forward a amelioration method of SNM.To avoid missing comparison and reduce excrescent comparison,adopting changing flexible window method,which changed the size of window dynamically.Solved the problem of subjectivity and inaccurate with fixed field weight offer by man-made by using dynamic adjusting ranking method,and according the record similarity to adjust the rank of field.And it transferred the ranking of field to weight by rank-based weights method.The experiments on the data from the information system show the effectiveness and advantage of the proposed method.At the same time,these two methods are the same with other approximately duplicate records examine methods which based on sorted-merge,advancing the efficiency and accuracy.