Parallel piplelined function not parallelizing with ref cursor

Question

RDBMS 11.2.0.3
I have a function with the following signature
function to_file (
  p_source     in  sys_refcursor
, p_file_name  in  varchar2
, p_directory  in  varchar2 default 'DD_DUMP'
return dd_dump_ntt
pipelined
parallel_enable ( partition p_source by any )
authid current_user;The function works in parallel when I use a cursor expression like this
begin
  for rec in ( select *
               from table(dd_dump.to_file( cursor(select /*+ parallel(i 4) */ c1||chr(9)||c2 from mytable i), 'f.out' ))
  loop
    dbms_output.put_line(rec.file_name || chr(9) || rec.num_records );
  end loop;
end;
f.out_162     276234
f.out_213     280399
f.out_230     286834
f.out_70     289549But when I use a refcursor, it does not run in parallel
declare
  rc sys_refcursor;
begin
  open rc for 'select /*+ parallel(i 4) */ c1||chr(9)||c2 from mytable i';
  for rec in ( select *
               from table(dd_dump.to_file( rc, 'f.out' ))
  loop
    dbms_output.put_line(rec.file_name || chr(9) || rec.num_records );
  end loop;
end;
f.out_914     1133016Is this an expected behavior or am I doing something wrong? How can I use the function when the client returns the SQL statement as a character string
Edited by: Sanjeev Chauhan on Mar 9, 2012 11:54 AM

Answer 1

Sanjeev Chauhan wrote:
I am not performing any DML in the pipelined function. If you read the note carefuly it shows parallel_enable works only when you use:
table(table_function(<font color=red>CURSOR</font>(select...)))and not when you use
table(table_function(<font color=red>ref-cursor-name</font>))SY.