How to optimize query in oracle??

Question

hello all,
i want to question this forum. How i can optimize query sql in oracle where i have data > 100.000 record in my table.. This is my query:
select avg(
select /*+ NO_USE_NL(B) */ (SUM(A.QTY_INSTORE) + SUM(A.QTY_DELIVERED)) TOTAL_DUMMY
            from daily_distribution_pop a,
                 ref_toko b
           where substr(a.svm_id, 1, 10) = b.id
             and b.segment_type = 'A'
             and b.enable_flag = 'Y'
             and substr(a.pom_id, 1, 2) in ('PO')
             and substr(a.svm_id, 1, 4) = '1203'
             and to_char(a.tgl_visit, 'iw') = '09'
             AND A.TGL_VISIT = (SELECT MAX(A.TGL_VISIT)
                                  FROM daily_distribution_pop A
                                 WHERE SUBSTR(SVM_ID, 1, 10) = B.ID
                                   and to_char(A.tgl_visit, 'iw') = '09')
             AND (A.QTY_INSTORE <> 0
                   OR A.QTY_DELIVERED <> 0)
select COUNT(DISTINCT B.ID)
  from daily_distribution_pop A1,
       ref_toko b
where b.id = substr(A1.svm_id, 1, 10)
   AND b.segment_type = 'A'
   AND b.enable_flag  = 'Y'
   AND substr(A1.pom_id, 1, 2) in ('PO')
   AND '1203' = substr(A1.svm_id, 1, 4)
   AND '09' = to_char(A1.tgl_visit, 'iw')
   AND A1.TGL_VISIT = (SELECT /*+ NO_PUSH_SUBQ */ MAX(A2.TGL_VISIT)
                          FROM daily_distribution_pop A2
                         WHERE B.ID = SUBSTR(SVM_ID, 1, 10)
                           AND to_char(A2.tgl_visit, 'iw') = to_char(A1.tgl_visit, 'iw'))
   AND (0 <> A1.QTY_INSTORE
         OR 0 <> A1.QTY_DELIVERED)) total from duall;this query is work but when i upload to my application program (asp.net) this query very slowly when i access from my internet. I try in local not slowly. May be in this forum i can find answer from my problem..I'm stuck. Thanks for your answer
Edited by: xoops on Mar 26, 2010 2:07 AM
Edited by: xoops on Mar 26, 2010 2:07 AM
Edited by: xoops on Mar 26, 2010 2:08 AM

Answer 1

xoops wrote:
sorry i not understand whta do you mean. Sory i newbie in oracle; THanksAlex was asking (i believe) why you have the hints on the SQL statements. Hints are typically a last resort, and if you are a newbie as you say, they are very likely NOT the route you should be investigating.
I notice you are having to do A LOT of data manipulation in order to join your tables, this suggests a bad data model (like when you have to join a table to another one based on the first 4 characters in a string). Is there any chance you can change that? If not, you can at least hope to allow access paths by using things like LIKE instead of SUBSTR.
I've made a couple changes to your first query, removing the double access to the daily_distribution_pop table, and replacing the substr's with LIKE conditions (no idea what if any indexes you have on these tables).
If this is any better, you should be able to make the same sort of changes to your second query. If it's no better than what you have now, you'll have to follow the links provided by Alex and give us a lot more information. And my suggestion would be to fix the data model as a starting point.
select
   avg(the_sums)
from
   select
      (sum(a.qty_instore) + sum(a.qty_delivered)) as the_sums
   from
      select
         a.qty_instore,
         a.qty_delivered,
         a.tgl_visit,
         max(a.tgl_visit) over (partition by b.id) as max_tgl_visit
      from
         daily_distribution_pop  a,
         ref_toko                b
      where substr(a.svm_id, 1, 10) = b.id
      and   b.segment_type          = 'A'
      and   b.enable_flag           = 'Y'
      --and   substr(a.pom_id, 1, 2) in ('PO')
      and   a.pom_id like 'PO%'
      --and   substr(a.svm_id, 1, 4)     = '1203'
      and   a.svm_id like '1203%'
      and   to_char(a.tgl_visit, 'iw') = '09'
      and   (a.qty_instore  0 or a.qty_delivered  0)
   where max_tgl_visit = tgl_visit
);