Query below lists:

(A) all objects used in views accessible to the current user in Oracle database

(B) all objects used in views in Oracle database

Query was executed under the Oracle9i Database version.

Query

A. Views accessible to the current user

select owner as schema_name,
       name as view_name,
       referenced_owner as referenced_schema_name,
       referenced_name,
       referenced_type
from sys.all_dependencies
where type = 'VIEW'
-- excluding some Oracle maintained schemas
and owner not in ('ANONYMOUS','CTXSYS','DBSNMP','EXFSYS', 'LBACSYS', 
   'MDSYS', 'MGMT_VIEW','OLAPSYS','OWBSYS','ORDPLUGINS', 'ORDSYS','OUTLN', 
   'SI_INFORMTN_SCHEMA','SYS','SYSMAN','SYSTEM','TSMSYS','WK_TEST','WKSYS', 
   'WKPROXY','WMSYS','XDB','APEX_040000', 'APEX_PUBLIC_USER','DIP', 
   'FLOWS_30000','FLOWS_FILES','MDDATA', 'ORACLE_OCM', 'XS$NULL',
   'SPATIAL_CSW_ADMIN_USR', 'SPATIAL_WFS_ADMIN_USR', 'PUBLIC')  
order by owner, name, referenced_name, referenced_owner, referenced_type;

B. If you have privilege on dba_dependencies

select owner as schema_name,
       name as view_name,
       referenced_owner as referenced_schema_name,
       referenced_name,
       referenced_type
from sys.dba_dependencies
where type = 'VIEW'
-- excluding some Oracle maintained schemas
and owner not in ('ANONYMOUS','CTXSYS','DBSNMP','EXFSYS', 'LBACSYS', 
   'MDSYS', 'MGMT_VIEW','OLAPSYS','OWBSYS','ORDPLUGINS', 'ORDSYS','OUTLN', 
   'SI_INFORMTN_SCHEMA','SYS','SYSMAN','SYSTEM','TSMSYS','WK_TEST','WKSYS', 
   'WKPROXY','WMSYS','XDB','APEX_040000', 'APEX_PUBLIC_USER','DIP', 
   'FLOWS_30000','FLOWS_FILES','MDDATA', 'ORACLE_OCM', 'XS$NULL',
   'SPATIAL_CSW_ADMIN_USR', 'SPATIAL_WFS_ADMIN_USR', 'PUBLIC') 
order by owner, name, referenced_name, referenced_owner, referenced_type;

Columns

• schema_name - schema name
• view_name - view name
• referenced_schema_name - schema of the referenced object
• referenced_name - name of the referenced object
• referenced_type - type of the referenced object

Rows

• One row represents one object used in a specific view in a database
• Scope of rows: (A) all objects used by the views accessible to the current user in Oracle database, (B) all objects used by views in Oracle database
• Ordered by schema name, view name, referenced object's name, referendced schema name, type of the referenced object

Sample results