一个真正的关系型数据库管理系统，既在逻辑层考虑到完全规范化的数据库，又提供数据的物理存储，这些数据为了高性能而被调整。

A true relational DBMS would allow for a fully normalized database at the logical level, while providing physical storage of data that is tuned for high performance.

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数据库层采用了基于关系型存储的数据仓库。

In the database layer, a data warehouse based on relational storage mechanism is used.

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数据库层采用了基于关系型存储的数据仓库。

In the database layer, a data warehouse based on relational storage mechanism is used.

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