How to optimize the select query executed in a cursor for loop?

Hi friends,

I run the code below and clocked at the same time for each line of code using DBMS_PROFILER.
CREATE OR REPLACE PROCEDURE TEST
AS
   p_file_id              NUMBER                                   := 151;
   v_shipper_ind          ah_item.shipper_ind%TYPE;
   v_sales_reserve_ind    ah_item.special_sales_reserve_ind%TYPE;
   v_location_indicator   ah_item.exe_location_ind%TYPE;

   CURSOR activity_c
   IS
      SELECT *
        FROM ah_activity_internal
       WHERE status_id = 30
         AND file_id = p_file_id;
BEGIN
   DBMS_PROFILER.start_profiler ('TEST');

   FOR rec IN activity_c
   LOOP
      SELECT DISTINCT shipper_ind, special_sales_reserve_ind, exe_location_ind
                 INTO v_shipper_ind, v_sales_reserve_ind, v_location_indicator
                 FROM ah_item --464000 rows in this table
                WHERE item_id_edw IN (
                         SELECT item_id_edw
                           FROM ah_item_xref --700000 rows in this table
                          WHERE item_code_cust = rec.item_code_cust
                            AND facility_num IN (
                                   SELECT facility_code
                                     FROM ah_chain_div_facility --17 rows in this table
                                    WHERE chain_id = ah_internal_data_pkg.get_chain_id (p_file_id)
                                      AND div_id = (SELECT div_id
                                                      FROM ah_div --8 rows in this table 
                                                     WHERE division = rec.division)));
   END LOOP;

   DBMS_PROFILER.stop_profiler;
EXCEPTION
   WHEN NO_DATA_FOUND
   THEN
      NULL;
   WHEN TOO_MANY_ROWS
   THEN
      NULL;
END TEST;
The SELECT inside the LOOP FOR cursor query took 773 seconds.
I tried to use COLLECT in BULK instead of a cursor for loop, but it did not help.
When I took the select query separately and executed with a value of the sample, and then he gave the results in a Flash of a second.

All tables have primary key index.
Any ideas what can be done to make this code more efficient?

Thank you
Raj. 
DECLARE
  v_chain_id ah_chain_div_facility.chain_id%TYPE := ah_internal_data_pkg.get_chain_id (p_file_id);

  CURSOR cur_loop IS
  SELECT * -- better off explicitly specifying columns
  FROM ah_activity_internal aai,
  (SELECT DISTINCT aix.item_code_cust, ad.division, ai.shipper_ind, ai.special_sales_reserve_ind, ai.exe_location_ind
     INTO v_shipper_ind, v_sales_reserve_ind, v_location_indicator
     FROM ah_item ai, ah_item_xref aix, ah_chain_div_facility acdf, ah_div ad
    WHERE ai.item_id_edw = aix.item_id_edw
      AND aix.facility_num = acdf.facility_code
      AND acdf.chain_id = v_chain_id
      AND acdf.div_id = ad.div_id) d
  WHERE aai.status_id = 30
    AND aai.file_id = p_file_id
    AND d.item_code_cust = aai.item_code_cust
    AND d.division = aai.division;         

BEGIN
  FOR rec IN cur_loop LOOP
    ... DO your stuff ...
  END LOOP;
END;

Published by: Dave hemming on December 4, 2008 09:17

Tags: Database

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