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Oracle9i OLAP User's Guide
Release 2 (

Part Number A95295-02
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Understanding Hierarchies

A hierarchy is an OLAP 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 "OLAP Metadata Model".

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.