The main purpose of allocating free space is to keep the data rows in the same physical sequence as the clustering index, thus reducing the need to frequently reorganize the data.
分配空余空间的主要目的是使数据行的物理顺序与群集索引一致，以减少频繁重组数据的需要。
2
The degree of clustering of an index; that is, the extent to which the physical sequenceof rows in a table follows an index.
一个索引的群集程度；即，表中行的物理顺序与索引的符合程度。
3
For column 1, the calculated position is the index into the sequenceof seeds; for the other columns, the calculated position is the position of the appropriate element.