The design of spatial data accessing engine is the key for object RDMBS to memory and query spatial data.
为使对象关系数据库更方便存储和查询空间数据，空间数据访问引擎的设计是关键。
Building a spatial data accessing engine, it can finish majority works of spatial data and manage big range and multi-scale geographic information.
构建空间数据访问引擎，实现对大范围、多尺度地理信息的管理和基本操作。
The effects of clustering the rows by their spatial properties rely on accessing just a subset of the data during query time.
按照空间属性聚集这些行的效果取决于在查询时对一个数据子集的访问。
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