A serverdb, i.e. a database instance, consists of the catalog and the user data.
The catalog comprises metadata which stores the definitions of database objects such as
base tables,
view tables,
synonyms,
value ranges,
indexes,
users and usergroups. The catalog consists of several parts. One part comprises information on the installed database system and the metadata with the user and usergroup definitions. This part is not assigned to a user or usergroup. The catalog contains a part for each user or usergroup with the metadata for the objects created by the user or usergroup in question. This includes metadata on base tables, view tables, etc. Users can only access the metadata of other users or usergroups if they have been granted the necessary privileges.
The user data is all of the rows in all of the base tables.
