CONNECT system/manager@ZEN2K7
CREATE USER repadmin IDENTIFIED BY repadmin;
ALTER USER repadmin DEFAULT TABLESPACE POOL_DATA;
ALTER USER repadmin TEMPORARY TABLESPACE TEMP;
GRANT connect, resource TO repadmin;
EXECUTE dbms_repcat_admin.grant_admin_any_schema('repadmin');
GRANT comment any table TO repadmin;
GRANT lock any table TO repadmin;
EXECUTE dbms_defer_sys.register_propagator('repadmin');
GRANT execute any procedure TO repadmin;
CREATE PUBLIC DATABASE LINK DB USING 'test2';

CONNECT repadmin/repadmin@ZEN2K7
CREATE DATABASE LINK DB CONNECT TO repadmin IDENTIFIED BY repadmin;

CONNECT system/manager@DB
CREATE USER repadmin IDENTIFIED BY repadmin;
ALTER USER repadmin DEFAULT TABLESPACE POOL_DATA;
ALTER USER repadmin TEMPORARY TABLESPACE TEMP;
GRANT connect, resource TO repadmin;
EXECUTE dbms_repcat_admin.grant_admin_any_schema('repadmin');
GRANT comment any table TO repadmin;
GRANT lock any table TO repadmin;
EXECUTE dbms_defer_sys.register_propagator('repadmin');
GRANT execute any procedure TO repadmin;
CREATE PUBLIC DATABASE LINK ZEN2K7 USING 'test1';

CONNECT repadmin/repadmin@DB
CREATE DATABASE LINK ZEN2K7 CONNECT TO repadmin IDENTIFIED BY repadmin;

CONNECT repadmin/repadmin@ZEN2K7 
BEGIN
DBMS_REPCAT.CREATE_MASTER_REPGROUP(
gname => '"REPTEST"',
qualifier => '',
group_comment => '');
END;

BEGIN
     DBMS_REPCAT.ADD_MASTER_DATABASE(
     gname => '"REPTEST"',
     master => 'DB',
     use_existing_objects => TRUE ,
     copy_rows => TRUE ,
     propagation_mode =>'SYNCHRONOUS');
END;