Query Tune - Expensive Window sort.

Question

I want some advise to tune this query.
My database version:
SQL> SELECT * FROM v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bi
PL/SQL Release 10.2.0.5.0 - Production
CORE    10.2.0.5.0      Production
TNS for IBM/AIX RISC System/6000: Version 10.2.0.5.0 - Productio
NLSRTL Version 10.2.0.5.0 - Production
SQL> The query
SQL> EXPLAIN PLAN FOR
  2   WITH INN AS
  3    (
  4           SELECT /*+ PARALLEL(log,8)  */
  5                  item_no,
  6                  item_type,
  7                  bu_code_send,
  8                  bu_type_send,
  9                  bu_code_rcv,
10                  bu_type_rcv,
11                  from_date_rcv,
12                  to_date_rcv,
13                  lt_val,
14                  lt_val_uom_code,
15                  upd_dtime,
16                  delete_dtime,
17                  ROW_NUMBER() OVER(PARTITION BY item_no,     item_type,   bu_code_send, bu_type_send,
18                                                 bu_code_rcv, bu_type_rcv, from_date_rcv
19                                        ORDER BY upd_dtime DESC) AS nr
20             FROM log.CEM_TOTAL_LEADTIME_T_LOG log
21            WHERE UPD_DTIME      <  TO_DATE ('13-11-2012','DD-MM-YYYY')
22                   )
23   SELECT
24         item_no,
25         item_type,
26         bu_code_send,
27         bu_type_send,
28         bu_code_rcv,
29         bu_type_rcv,
30         from_date_rcv,
31         to_date_rcv,
32         lt_val,
33         lt_val_uom_code,
34         SYSDATE
35    FROM  inn
36   WHERE DELETE_DTIME IS NULL
37     AND NR=1
38     AND to_DATE ('13-11-2012','DD-MM-YYYY') BETWEEN from_date_rcv AND NVL(to_date_rcv, '31-DEC-9999')
39     ;
Explained.The Plan
PLAN_TABLE_OUTPUT
Plan hash value: 3866412310
| Id  | Operation                      | Name                     | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     | Pstart| Pstop |    TQ  |IN-OUT| PQ Distrib |
|   0 | SELECT STATEMENT               |                          |   331M|    26G|       |   374K  (4)| 00:50:30 |       |       |        |      |            |
|   1 |  PX COORDINATOR                |                          |       |       |       |            |          |       |       |        |      |            |
|   2 |   PX SEND QC (RANDOM)          | :TQ10001                 |   331M|    26G|       |   374K  (4)| 00:50:30 |       |       |  Q1,01 | P->S | QC (RAND)  |
|*  3 |    VIEW                        |                          |   331M|    26G|       |   374K  (4)| 00:50:30 |       |       |  Q1,01 | PCWP |            |
|*  4 |     WINDOW SORT PUSHED RANK    |                          |   331M|    20G|    29G|   374K  (4)| 00:50:30 |       |       |  Q1,01 | PCWP |            |
|   5 |      PX RECEIVE                |                          |   331M|    20G|       |   374K  (4)| 00:50:30 |       |       |  Q1,01 | PCWP |            |
|   6 |       PX SEND HASH             | :TQ10000                 |   331M|    20G|       |   374K  (4)| 00:50:30 |       |       |  Q1,00 | P->P | HASH       |
|*  7 |        WINDOW CHILD PUSHED RANK|                          |   331M|    20G|       |   374K  (4)| 00:50:30 |       |       |  Q1,00 | PCWP |            |
|   8 |         PX BLOCK ITERATOR      |                          |   331M|    20G|       |  7123  (44)| 00:00:58 |     1 |   167 |  Q1,00 | PCWC |            |
|*  9 |          TABLE ACCESS FULL     | CEM_TOTAL_LEADTIME_T_LOG |   331M|    20G|       |  7123  (44)| 00:00:58 |     1 |   167 |  Q1,00 | PCWP |            |
Predicate Information (identified by operation id):
   3 - filter("DELETE_DTIME" IS NULL AND "NR"=1 AND NVL("TO_DATE_RCV",TO_DATE(' 9999-12-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))>=TO_DATE(' 2012-11-13
PLAN_TABLE_OUTPUT
              00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
   4 - filter(ROW_NUMBER() OVER ( PARTITION BY "ITEM_NO","ITEM_TYPE","BU_CODE_SEND","BU_TYPE_SEND","BU_CODE_RCV","BU_TYPE_RCV","FROM_DATE_RCV" ORDER BY
              INTERNAL_FUNCTION("UPD_DTIME") DESC )<=1)
   7 - filter(ROW_NUMBER() OVER ( PARTITION BY "ITEM_NO","ITEM_TYPE","BU_CODE_SEND","BU_TYPE_SEND","BU_CODE_RCV","BU_TYPE_RCV","FROM_DATE_RCV" ORDER BY
              INTERNAL_FUNCTION("UPD_DTIME") DESC )<=1)
   9 - filter("FROM_DATE_RCV"<=TO_DATE(' 2012-11-13 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "UPD_DTIME"<TO_DATE(' 2012-11-13 00:00:00', 'syyyy-mm-dd
              hh24:mi:ss'))Some more thoughts/inputs:
1. The table CEM_TOTAL_LEADTIME_T_LOG has 333 million rows, It is a partition table but the range partition is on LOG_DATE column (not used in this query).
2. The window sort is taking huge temp space (wrong cardinality estimate ? How to correct ?)
3. Actually it is taking around 56 min to complete.

Answer 1

Not tested,
Just trying to eliminate the analytic function here. (I cannot check this --can do only syntax check)..
Firstly check if this is similar to your query and if yes, check if this improves the performance.
WITH t AS
        (SELECT item_no,
                item_type,
                bu_code_send,
                bu_type_send,
                bu_code_rcv,
                bu_type_rcv,
                from_date_rcv,
                to_date_rcv,
                lt_val,
                lt_val_uom_code,
                upd_dtime,
                delete_dtime
           FROM LOG.CEM_TOTAL_LEADTIME_T_LOG LOG
          WHERE UPD_DTIME < TO_DATE ('13-11-2012', 'DD-MM-YYYY')),
     t1 AS
        (  SELECT item_no,
                  item_type,
                  bu_code_send,
                  bu_type_send,
                  bu_code_rcv,
                  bu_type_rcv,
                  from_date_rcv,
                  to_date_rcv,
                  MAX (upd_dtime) upd_dtime
             FROM t
         GROUP BY item_no,
                  item_type,
                  bu_code_send,
                  bu_type_send,
                  bu_code_rcv,
                  bu_type_rcv,
                  from_date_rcv,
                  to_date_rcv)
SELECT a.item_no,
       a.item_type,
       a.bu_code_send,
       a.bu_type_send,
       a.bu_code_rcv,
       a.bu_type_rcv,
       a.from_date_rcv,
       a.to_date_rcv,
       a.lt_val,
       a.lt_val_uom_code,
       SYSDATE,
       a.upd_dtime
  FROM t1 a, t b
WHERE     a.item_no = b.item_no
       AND a.item_type = b.item_type
       AND a.bu_code_send = b.bu_code_send
       AND a.bu_type_send = b.bu_type_send
       AND a.bu_code_rcv = b.bu_code_rcv
       AND a.bu_type_rcv = b.bu_type_rcv
       AND a.from_date_rcv = b.from_date_rcv
       AND a.to_date_rcv = b.to_date_rcv
       AND a.upd_dtime = b.upd_dtime
       AND DELETE_DTIME IS NULL
       AND TO_DATE ('13-11-2012', 'DD-MM-YYYY') BETWEEN from_date_rcv
                                                    AND NVL (to_date_rcv,
                                                             '31-DEC-9999');Cheers,
Manik
Edited by: Manik on Nov 15, 2012 3:13 PM