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Extending HCL OneDB™Beyond standard relational database objects, HCL OneDB™ can be extended to handle specialized data types, access methods, routines, and other objects. HCL OneDB™ includes many built-in extensions that are fully integrated in the database server. HCL OneDB™ also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for HCL OneDB™.
HCL OneDB™ extensions and DataBlade® modulesThese topics describe how to use built-in database extensions and separately installed DataBlade® modules.
Database Extensions User's GuideThe HCL OneDB™ Database Extensions User's Guide explains how to use the database extensions that come with HCL OneDB™: Large Object Locator, MQ messaging, binary data types, basic text search, node data type, HCL OneDB™ web feature service for Geospatial Data, and SQL packages.
Hierarchical data typeThe node data type helps to resolve a difficult relational database problem–transitive closure.

Hierarchical data type

The node data type helps to resolve a difficult relational database problem–transitive closure.

This transitive closure problem is endemic to data management problems, and not particularly well addressed by the relational model. The same basic problem is found modeling organizational hierarchies, networks, manufacturing and process control databases.

You can use the node data type to improve query performance for many recursive queries. Using the node data type can also ease the burden of transitive dependency in the relational database model. Transitive dependency occurs when a non-key attribute is dependent on another non-key attribute. This relationship frequently has multiple levels of attribute dependency. The problem usually is seen when you model organizational hierarchies, networks, and databases for manufacturing and process control.