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Oracle® OLAP Reference 10g Release 2 (10.2) Part Number B14350-01 |
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# Understanding Hierarchies

A hierarchy is an OLAP Catalog metadata entity. This means that it is a logical object, identified by name and owner, within the OLAP Catalog.

Hierarchies define parent-child relationships between sets of levels in a dimension. There can be multiple hierarchies associated with a single dimension, and the same level can be used in multiple hierarchies. Hierarchies are fully described in.

Use the procedures in the `CWM2_OLAP_HIERARCHY` package to create, drop, and lock hierarchies and to specify descriptive information for display purposes.

The parent dimension must already exist in the OLAP Catalog before you can create hierarchies for it.

See Also: Chapter 15, "CWM2_OLAP_LEVEL" Oracle OLAP Application Developer's Guide for more information about hierarchies and the OLAP Catalog metadata model