The database catalog of a database contains the metadata for all database objects. The database catalog is made up of the following sections:
Information about the installation of the database system
Metadata about users and user groups
Metadata about database objects
This includes, among other things, metadata for base tables and view tables.
A user can only access the metadata of another user or user group if this user has been granted the relevant privileges.
Database Studio, Screen Areas of Database Studio, Creating and Using Database Objects: Overview
SQL Reference Manual, Data Definition, Authorization
Loader, Data Description