数据仓库存储大量历史数据，OLAP应用涉及到对大面积历史数据的复杂查询，查询优化是提高OLAP响应速度的关键。
Data warehouse stores volumes of historical data, and OLAP applications involve complex queries on these data. Queries optimization is the key of improving the speed of OLAP response.
数据仓库存储大量历史数据，OLAP应用涉及到对大面积历史数据的复杂查询，查询优化是提高OLAP响应速度的关键。
Data warehouses stores volumes of historical data, and OLAP applications involve complex queries on these data. Since response time should be small, query optimization is critical.
数据仓库存储大量历史数据，OLAP应用涉及到对大面积历史数据的复杂查询，查询优化是提高OLAP响应速度的关键。
Data warehouses stores volumes of historical data, and OLAP applications involve complex queries on these data. Since response time should be small, query optimization is critical.
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