The Data Dictionary is composed of tables and views primarily in database DBC. The dictionary also includes tables and views from other system databases (for example, Sys_Calendar, TD_SYSFNLIB, SYSUDTLIB, SystemFE, and SYSUIF), and from other databases (for example, TDMaps and SQLJ).
Dictionary tables contain metadata about system objects, privileges, events, and usage. These tables are reserved for system use, and must not be accessed directly. Users can retrieve data from tables indirectly, by accessing predefined Data Dictionary views. The database administrator can limit user access to dictionary views on a user-by-user or role-by-role basis.
Data Dictionary tables only change in major Analytics Database releases, but Data Dictionary views can change in minor releases.
The system databases, tables and associated views and macros are created at system initialization (sysinit) time.
You can use Teradata Studio or Teradata Studio Express to list the Data Dictionary system views and view details about each column.