create db FOO using codeset UTF- 8  territory en_US collate using IDENTITY pagesize  32  K
connect to FOO
create table test(id decimal( 10 ) not null primary key, val vargraphic( 10 ))
insert into test values( 1 , x'28290D')
insert into test values( 2 , x'2829')
commit
select id, hex(val) hval from test order by val, id

ID           HVAL
------------ ----------------------------------------
           1 . 00280029000D
           2 .  00280029 

   2  record(s) selected.

create table test(id int primary key, val varchar2( 10 ))
insert into test values( 1 , chr( 28 ) || chr( 29 ) || chr(0D))
insert into test values( 2 , chr( 28 ) || chr( 29 ))
commit
select id, dump(val,  16 ) hval from test order by val, id

ID	HVAL
---------------------------
 2 	Typ= 1  Len= 2 : 1c,1d
 1 	Typ= 1  Len= 3 : 1c,1d, 0 

select * from nls_session_parameters where parameter = 'NLS_SORT'
PARAMETER                      VALUE                                   
------------------------------ ----------------------------------------
NLS_SORT                       BINARY