The bigger problem... tunning!!

Hi everyone...
Actually i dont know how to tune a procedure... i am giving u all the data if u can please help me....

Function:
create or replace
function dump_data( p_query in varchar2,
p_dir in varchar2 ,
p_filename in varchar2 )
return number
is
l_output utl_file.file_type;
l_theCursor integer default dbms_sql.open_cursor;
l_columnValue varchar2(2000);
l_status integer;
l_colCnt number default 0;
l_separator varchar2(10) default '';
l_cnt number default 0;
begin
l_output := utl_file.fopen( p_dir, p_filename, 'w' );

dbms_sql.parse( l_theCursor, p_query,
dbms_sql.native );

for i in 1 .. 255 loop
begin
dbms_sql.define_column( l_theCursor, i,
l_columnValue, 2000 );
l_colCnt := i;
exception
when others then
if ( sqlcode = -1007 ) then exit;
else
raise;
end if;
end;
end loop;

dbms_sql.define_column( l_theCursor, 1,
l_columnValue, 2000 );

l_status := dbms_sql.execute(l_theCursor);

loop
exit when ( dbms_sql.fetch_rows(l_theCursor) <= 0 );
l_separator := '';
for i in 1 .. l_colCnt loop
dbms_sql.column_value( l_theCursor, i,
l_columnValue );
utl_file.put( l_output,
l_separator || l_columnValue );

end loop;
utl_file.new_line( l_output );
l_cnt := l_cnt+1;
end loop;
dbms_sql.close_cursor(l_theCursor);

utl_file.fclose( l_output );
return l_cnt;
end dump_data;

Procedure
create or replace
procedure MEXICO_NAFTA_CERTIFICATE_EXT as

l_rows number;
begin
l_rows := dump_data( 'select c1.certificate_nbr, c2.part_nbr as part171, c2.inactive_ind,
c2.hts_cde, c2.originating_ind, c3.iso_country_cde, c2.basis_cde, c2.producer_cde, c2.cert_cde,
c2.regional_value_content_cde, c2.part_nbr, c1.effective_dte
from certificates c1 , certificate_parts c2 ,displayed_countries_of_origin c3 where c1.certificate_nbr=c2.certificate_nbr and c2.certificate_nbr=c3.certificate_nbr',
',' '/d014/oradata/temp',
'MEXICO_NAFTA_CERTIFICATE_EXT.txt' );
dbms_output.put_line( to_char(l_rows) ||
' rows extracted to ascii file' );
end;

Both the function and procedures got executed without errors but its taking really long time to get output... it have to load almost 99842 rows in the text file...

i have to tune that query and i really dont know how to...

explain plan of the query:
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Plan hash value: 1014373765

--------------------------------------------------------------------------------
-----------------------------

| Id | Operation | Name | Rows | Bytes |Tem
pSpc| Cost (%CPU)| Time |

--------------------------------------------------------------------------------
-----------------------------


PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 18M| 813M|
| 7318 (3)| 00:01:43 |

|* 1 | HASH JOIN | | 18M| 813M|
16M| 7318 (3)| 00:01:43 |

| 2 | TABLE ACCESS FULL | DISPLAYED_COUNTRIES_OF_ORIGIN | 884K| 6047K|
| 394 (4)| 00:00:06 |

|* 3 | HASH JOIN | | 733K| 27M| 2
352K| 4554 (1)| 00:01:04 |

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------

| 4 | TABLE ACCESS FULL| CERTIFICATES | 99841 | 1170K|
| 657 (1)| 00:00:10 |

| 5 | TABLE ACCESS FULL| CERTIFICATE_PARTS | 733K| 19M|
| 2592 (2)| 00:00:37 |

--------------------------------------------------------------------------------
-----------------------------



PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------

1 - access("C2"."CERTIFICATE_NBR"="C3"."CERTIFICATE_NBR")
3 - access("C1"."CERTIFICATE_NBR"="C2"."CERTIFICATE_NBR")

18 rows selected.

it should be 99848 rows selected not 18 and i dont know why....

i am really not understaing... please some one help me....

Thanking You

Bhagya

Would you mind reading this ?

I read it.... and i understood it.... i have just started as an developer and i am really unable to figure out... i already had my first warning yesturday form my DB saying that my processes have hang up the database.... thats why i need some help.... plese help me if u can.....day by day i am getting near to losing my job...

I don't think so, read it again some of these points apply to this thread too

Ok.... The actual task is to get few columns(12) form 3 tables and extract them to a text file....i have tried and used the concept of UTIL File.... the above code is about it.... but i dint work properly.... can u help me now...

bhagya

No, you are still deliberately ignoring a few points, some of which are not only "cosmetic" but actually very important for query optimization, here they are