My procedure hang and wait long time

Question

i have a procedure that runs only following sql statement when i execute this procedure it take long time!!one day !!how could i improve the speed??
for job in (select r.job_name,r.run_id from
applsys.fnd_sch_job_runs r
where r.start_date< add_months(sysdate,-8))
loop
delete from applsys.fnd_sch_job_run_details
where run_id = job.run_id;
delete from applsys.fnd_sch_job_runs r where r.job_name=job.job_name ;
commit;
end loop;
*************************************************************

Answer 1

Your code...
for job in (select r.job_name,
                   r.run_id
              from applsys.fnd_sch_job_runs r
             where r.start_date < add_months( sysdate, -8 ) )
loop
  delete
    from applsys.fnd_sch_job_run_details
   where run_id = job.run_id;
  delete
    from applsys.fnd_sch_job_runs r
   where r.job_name =j ob.job_name ;
commit;
end loop;I will bet that there is an FK on fnd_sch_job_run_details that references fnd_sch_job_runs.
If that FK is not indexed then you will (in addition to locking fnd_sch_job_run_details) perform a FTS on fnd_sch_job_run_details for each row deleted from fnd_sch_job_runs.
Avoid this by:
1. Make sure that if there is an FK on fnd_sch_job_run_details that references fnd_sch_job_runs, that it is indexed.
2. Replace the cursor loop with something like
delete
  from applsys.fnd_sch_job_run_details
where run_id IN ( select r.run_id
                     from applsys.fnd_sch_job_runs r
                    where r.start_date < add_months( sysdate, -8 ) );
delete
  from applsys.fnd_sch_job_runs r
where r.start_date < add_months( sysdate, -8 );
commit;