Data Dictionary tables only change in major Database Engine 20 releases, but Data Dictionary views can change in minor releases.
Data Dictionary views may be accessible to all users by default or restricted.
During system installation, the database administrator can load the preceding views into the DBC user space.
For information about the privileges for Data Dictionary views, see Access to Data Dictionary Views.
You can query views using SQL requests. For details, see Querying Data Dictionary Views.
Data Dictionary views are used by administrators and by administrative tools. For more about how Data Dictionary views are used, see Tracking Resource Usage.