Now that the spatial table is populated, it is time to add a spatial index to support spatial queries; in DB2 that is a grid index.
既然已经填充了空间表，就应该添加空间索引来支持空间查询了；在DB 2中这是一个网格索引。
You can add more than one spatial index to each spatial column, but you must create them one at a time.
可以为每个空间列添加多个空间索引，但必须一次创建一个。
You can add more than one spatial index to each spatial column, but you must create them one at a time.
可以为每个空间列添加多个空间索引，但必须一次创建一个。
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