What is the role of DBD (Database Descriptor) in IMS DB?

In IMS DB (Information Management System Database), the Database Descriptor (DBD) plays a crucial role in defining the structure of the database and providing information necessary for accessing and manipulating database resources.

The DBD serves as a blueprint or metadata repository that contains detailed descriptions of the database schema, including segment definitions, relationships, access paths, and other relevant attributes.

Here's a breakdown of the role of DBD in IMS DB :

* Defines Database Structure
* Segment Definitions
* Relationships
* Access Paths
* Data Validation
* Generated Code