The commands to do list all the tables contained within the system catalog is ALL_TABLES.
ALL_TABLES is a command from Oracle database for list all tables that can be access by current user it include the tables that not owned by current user.
ALL_TABLES doesn't required user to have access to dba_tables which DBA_TABLES need the user (usually the user is a system) have access to dba_tables.
USER_TABLES is different too from ALL_TABLES. The USER_TABLES is only for tables that owned by current user.
So, to list all tables within system catalog, use command ALL_TABLES.
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