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。
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.
对于添加了空间列的源表，命令是相同的，只是表名(可能还有索引名)不一样。
For the single, integrated table, the command is the same except for the table (and optionally the index) name.
单击显示在该列表下面的命令按钮可以添加或删除空间索引。
You can add or delete spatial indexes by clicking the command buttons that appear under the list.
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。
You can add more than one spatial index to each spatial column, but you must create them one at a time.
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