DAte comparison hampering query??

Question

Hi,
I have the following query which is taking 17 seconds to retreive 10 records if date range spans more than 12 months. The explain plan is given below:
SELECT trunc(calendar_date,'MM'),sum(man_days_demand)
FROM (
SELECT TRUNC(cal.calendar_date) calendar_date,
(-- in line column qry to count the service reqs falling on that specific day
SELECT nvl(sum(count(ssrj.assigned_field_service_rep)),0)
FROM sop_service_request_job ssrj, sop_service_request ssr
WHERE (((cal.calendar_date between ssrj.scheduled_start_date AND
get_end_date(ssrj.scheduled_start_date,
ssrj.expected_service_hours,
ssrj.weekend)))
OR
(cal.calendar_date < ssrj.scheduled_start_date and
cal.calendar_date > get_end_date(ssrj.scheduled_start_date,
ssrj.expected_service_hours,
ssrj.weekend)))
and ssrj.service_request_id = ssr.service_request_id
and ssrj.assigned_field_service_rep is not null
and trunc(calendar_date,'MM') = trunc(cal.calendar_date,'MM')
group by cal.calendar_date
) Man_Days_demand
FROM sop_fiscal_calendar_v cal, sop_service_user ssu, sop_service_request ssr,
sop_service_request_job ssrj, CSA_PLATFORM_MASTER cpm
WHERE
trunc(calendar_date,'MM') between trunc(to_date('&date_range_start_date','mm/dd/yyyy'),'MM')
AND trunc(to_date('&date_range_end_date','mm/dd/yyyy'),'MM')
and ssu.sso_id = ssrj.assigned_field_service_rep
and ssrj.service_request_id = ssr.service_request_id
GROUP BY calendar_date
GROUP BY trunc(calendar_date,'MM')
SELECT STATEMENT, GOAL = CHOOSE
SORT GROUP BY
  VIEW
   SORT GROUP BY
    FILTER
     NESTED LOOPS
      HASH JOIN
       TABLE ACCESS FULL
       MERGE JOIN CARTESIAN
        MERGE JOIN CARTESIAN
         INDEX FAST FULL SCAN
         BUFFER SORT
          INDEX FULL SCAN
        BUFFER SORT
         INDEX FULL SCAN
      INDEX UNIQUE SCANThe above query returns sum of demand for each month.
How can i tune this query to perform faster?
Thanks,
JP

Answer 1

Maybe rethink your TRUNC statements?
One condition in your SELECT statement is:
trunc(calendar_date,'MM') between trunc(to_date('&date_range_start_date','mm/dd/yyyy'),'MM')
AND trunc(to_date('&date_range_end_date','mm/dd/yyyy'),'MM')
You could change that to_
calendar_date BETWEEN TRUNC(TO_DATE('&date_range_start_date', 'mm/dd/yyyy'), 'MM')
                  AND ADD_MONTHS(TRUNC(TO_DATE('&date_range_end_date','mm/dd/yyyy'), 'MM'), 1)
not tested
C.