ora-01489: result of string concatenation is too long

select
c.obj_name , obj_childs, obj_parents,d.Obj_type ,d.description,d.sub_system
from
(select  obj_name, LISTAGG(obj_child, ',') WITHIN GROUP (ORDER BY obj_child)  obj_childs
 from
 (select distinct c.obj_name,
          oc.obj_name obj_child
   from cal_obj c,
   cal_erd_link ec,
   cal_obj oc
   where ec.obj_parent(+) = c.obj_name  
   and   ec.obj_child  = oc.obj_name(+) 
 )
 group by obj_name
 ) c
,
(select obj_name, LISTAGG(obj_parent, ',') WITHIN GROUP (ORDER BY obj_parent)  obj_parents
 from
 (select distinct c.obj_name,
         op.obj_name obj_parent
   from cal_obj c,
   cal_erd_link ep ,
   cal_obj op
   where ep.obj_child(+)  = c.obj_name  
   and   ep.obj_parent = op.obj_name(+)
 )
 group by obj_name
 ) p
, cal_obj d
where c.obj_name = p.obj_name
and   d.obj_name = c.obj_name

how can i immpelent this functions in my sql
xmlagg
or this

select owner, type_name, coll_type, elem_type_name, upper_bound, length 
 from all_coll_types
 where elem_type_name = 'VARCHAR2';
e.g. on my db, I can use sys.DBMSOUTPUT_LINESARRAY which is a varray of considerable size.

or to_clob
select department, 
       cast(collect(name) as sys.DBMSOUTPUT_LINESARRAY) 
  from emp 
 group by department;

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