Query tuning for fast retrivel of data.

Question

Hi,
I am having a main function which returns a ref cursor.
1.Inside this function we are using a cursor which fetches 400 record of data.Inside the same function we are using an another function which return data in tab type.
2.the logic inside the main function is based on the condition the in the cusor loop a branch value is compared with the one branch column in tab type if both are equal then we are inserting data into another tab type.
3.In the main function only we are calling another function,were we send one of the parameter as tab type.
the below is code..
FUNCTION get_wb_for_rte(p_rte_id NUMBER,
                              p_br_id NUMBER,
                              p_mod_id NUMBER,
                              p_part_data NUMBER)
RETURN OPS_SAFEX_UTL.CURSORTYP as
CURSOR c_wb_unld_hub is
SELECT DISTINCT ow.id id,'N' excs
FROM ops_waybl ow,
     ops_wb_mfst owm,
     ops_prov_ult opu,
     ops_pult_wb_dtls opwd,
     ops_uult_wb_dtls ouuwd
WHERE ow.id =owm. waybl_id
AND owm.id=opwd.wb_mfst_id
AND opwd.id=ouuwd.pult_wb_dtls_id
AND opwd.prov_ult_id=opu.id
AND opu.from_br_mast_id=p_br_id
AND ops_hub_utl.get_avlpkgs_ld(ow.id)>0
UNION
SELECT DISTINCT ouer.waybl_id id, 'Y' excs
FROM ops_uult_excess_recd ouer
WHERE ops_hub_utl.get_avl_xs_pkgs_ld(ouer.waybl_id)>0
ORDER BY id;
BEGIN
track_flag:=1;
     v_wb_dtls(1):=null;
     v_dest_br := ops_safex_utl.get_dest_br_for_rte(p_rte_id,p_br_id);
     If (v_dest_br(1)=2) then
     track_flag:=2;
          for rec_wb_unld_hub in c_wb_unld_hub loop
          v_br_id := ops_safex_utl.get_wb_dest_id (rec_wb_unld_hub.id);
          for v_dest_ptr in v_dest_br.first+1..v_dest_br.last loop
          IF v_br_id=v_dest_br(v_dest_ptr) THEN
          v_wb_ptr:=v_wb_ptr+1;
          dbms_output.put_line(rec_wb_unld_hub.id);
          v_wb_dtls(v_wb_ptr).id:=rec_wb_unld_hub.id;
          v_wb_dtls(v_wb_ptr).excs:=rec_wb_unld_hub.excs;
          end if;
          end loop;
          end loop;
track_flag:=3;
     v_qry_str := ops_hub_utl.get_wb_dtls(v_wb_dtls,p_part_data,p_rte_id,p_br_id);
     end if;
open cur1 for v_qry_str;
     RETURN cur1;
END get_wb_for_rte;
this function is taking nealry 12 min ..in the mean while the application is getting timed out.
we are having one more idea of using temporary tables instead of cursors..please advice which will be good in performance point of aspect.
Please advice .
Thanks & Regards
sudhir

Answer 1

3.Actually the major performance issue is comming up at cusor loop where i am comparing the curosr data with the data in tab type.(i.e) i need to compare each row with all the rows in the tab type..there it is taking much time.Once the Branch value is matched why bother to iterate though the rest of the records from the inner loop. The EXIT will come out of the inner loop when matched and continue with the rest of the records from the cursor – Outer loop
for v_dest_ptr in v_dest_br.first+1..v_dest_br.last loop
IF v_br_id=v_dest_br(v_dest_ptr) THEN
v_wb_ptr:=v_wb_ptr+1;
dbms_output.put_line(rec_wb_unld_hub.id);
v_wb_dtls(v_wb_ptr).id := rec_wb_unld_hub.id;
v_wb_dtls(v_wb_ptr).excs := rec_wb_unld_hub.excs;
EXIT;
end if;
end loop;
end loop;
Shailender Mehta