And it is applied to the fuzzy transitivity - relation , and then gets the map between the relation graph and the transitivity - relation . the system of formal 3 - transitivity is classified and analyzed again by the new method . the result of literature is improved , and the inclusion between them is clearer 在给出广义模糊传递性概念的基础上，用逆序导出集确定传递阵之间的层次关系，并将关系图体系下得到的结果运用到形式三传递模糊矩阵体系中，对形式三传递模糊矩阵重新进行了归类和分析，运用新的方法，将文献中分为17类的结果推进至12类，并进一步理清了它们之间的包含关系。
In a quick test on a table with 100 , 000 rows loaded using a sequence , a normal index was used for most queries returning up to 30 rows , as was the reverse key index , however , when the number of rows went up to 1 , 000 , 000 the reverse key index was never used and a full table scan was used every time 在一个用一个序列载入并含100 , 000行的表上做一个快速的测试，分别用普通索引和逆序索引查询并返回30行数据，当行数增长到1 , 000 , 000 ，将不再使用逆序索引而是每次使用全表扫描。
