An OLAP query often needs read-only access of data records for summarization and aggregation.

通常，OLAP查询只需要对数据记录进行只读访问，以进行汇总和聚集。

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Therefore, improving the OLAP query performance becomes the key issue in the field of data warehouse.

因此，提高联机分析处理的查询性能就成为了数据仓库领域的关键问题。

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JOLAP's query model deals with OLAP query management, and its source model facilitates the implementation of vendor-specific primitive OLAP extensions.

JOLAP的查询模型处理OLAP查询管理，它的源模型方便了特定于供应商的OLAP原语扩展的实现。

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