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。
Selected Spatial Index list displays any spatial indexes that have been defined for the table.
“已选空间索引”列表显示为表定义的所有空间索引。
Selected Spatial Index list displays any spatial indexes that have been defined for the table.
“已选空间索引”列表显示为表定义的所有空间索引。
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