Optimize the following update on per_all_assignments_F

Question

Hi
I am trying to optimize this sql which is taking a long time to complete.
declare
cursor c1 is
select person_id, annual_rt from xxdl.xxdl_papf_scrambling_view;
begin
for i in c1
loop
update PER_ALL_ASSIGNMENTS_F
set as_attribute4 = i.annual_rt
where person_id = i.person_id
end loop;
end;
There are indexes on ass_attribute4, i.annual_rt, person_id, i.person_id.
per_all_assignments_f is a standard oracle apps table.
xxdl.xxdl_papf_scrambling_View is a custom table that I created by joining some columns in per_all_people_f and some other views and tables in peoplesoft database. Basically the objective is to scramble the data in oracle based on already scrambled data in peoplesoft. So I create xxdl_papf_scrambling_view using info from psft database (over a db link) and then try to use the information in the custom table to update the ebusiness tables on oracle financials. The updates appears to be working except that some of them like the one above are slow.
I tried using a corelated update (but it does not work because single row subquery returns more than one row and I was not sure how to join these tables to make it return one row based on how I created the above tables)
and I used bulk collect and forall but the performance is not any better.
Any ideas or suggestions.
Thank you
Kumar
Edited by: Kumar Madduri on Nov 2, 2009 6:55 AM

Answer 1

Hi
I tried that approach already but the subquery returns more than one row.
ERROR at line 2:
ORA-01427: single-row subquery returns more than one row
and this one runs in roughly one hour which I am trying to further reduce
declare
cursor c1 is
select person_id, annual_rt from xxdl.xxdl_papf_scrambling_view;
type pid_tab is table of xxdl.xxdl_papf_scrambling_view.person_id%type;
type art_tab is table of xxdl.xxdl_papf_scrambling_view.annual_rt%type;
pid_tab1 pid_tab;
art_tab1 art_tab;
begin
open c1;
loop
fetch c1 bulk collect into pid_tab1, art_tab1;
forall i in 1..pid_tab1.count
update PER_ALL_ASSIGNMENTS_F
set ass_attribute4 = art_tab1(i)
where person_id = pid_tab1(i);
exit when c1%notfound;
end loop;
close c1;
end;
Edited by: Kumar Madduri on Nov 2, 2009 7:09 AM