Performance Hit Due to NVL() Function

Question

Hi,
I am from dev project team,we are facing a performance hit due to NVL() function,pls give a solution to resolve this issue.
the below is my function which i created to calculate some efforts.
create or replace function check_function(
v_deal_detail ,
v_tower ,
v_subtower,
v_location ,
v_client_role ,
v_emp_category ,
v_year ,
v_state )
return number
is
v_trans_offshore_efforts number(30,8) default 0;
v_stdy_offshore_efforts number(30,8) default 0;
begin
if v_state =1
or v_state is null
then
begin
select nvl(sum(decode (d.loc_type_id,
crmuat_global_constant_pkg.GLB_OFFSHORE,
s.trans_efforts,
0)),0)
into v_trans_offshore_efforts
from prc_calc_trans_fte_dtls_t s, prc_deal_dtl_loc_dtls_t d
where s.deal_detail_id= d.deal_detail_id
and s.tower_id = d.tower_id
and s.location_id = d.location_id
and s.deal_detail_id = v_deal_detail
and s.client_role_id = nvl(v_client_role,s.client_role_id)
and s.emp_category_id = nvl(v_emp_category,s.emp_category_id)
and s.tower_id = v_tower
and s.subtower_id = nvl(v_subtower,s.subtower_id)
and s.location_id = nvl(v_location,s.location_id)
and s.year_no = v_year;
exception
when no_data_found
then
v_trans_offshore_efforts := 0;
end;
end if;
if v_state = 1
then
return v_trans_offshore_efforts;
end if;
end;
pls give me a solution.
Regards,
shinu

Answer 1

{message:id=9360003}