A data warehouse is a storage facility for read-only, historical and aggregated data.
数据仓库是用于只读、历史和聚合数据的存储设施。
It not only saves the storage space, but also is more convenient to retrieve an spatial object and quarry over a historical event.
它不仅节省了存贮空间,而且对空间对象的检索和历史事件的查询带来了方便。
According to the structural characteristic of multidimensional data model and OLAP's needs, a various granularity storage method has been presented to store historical data.
文中根据多维数据模型的结构特点以及OLAP需求提出了一种变粒度存储策略。
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