通过节点数据类型以及它所支持的函数，可以在关系数据库中表示分层数据。
The node data type, with its supporting functions, gives you the ability to represent hierarchical data within the relational database.
它提供了很多面向应用程序开发人员的新特性、分层数据结构支持和改进的跨多个数据库实例的查询能力。
It offers many new features for application developers, hierarchical data structure support, and improved query capabilities across multiple instances of the database.
监测数据分层处理和存储，下层数据库为其上层的数据处理服务。
Monitoring data are stored layer by layer, and the database in the lower layer serves data processing in the upper layer.
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