Tunning Required! One more one for the Challengers!

Question

Hi all,
This is one more to challenge!
SELECT COUNT(1) FROM WHSE_LOC WHERE ((AREA_C,WKSTN_C) IN (SELECT AREA_C, WKSTN_C FROM WHSE_LOC WHERE AISLE_I = :B3 AND BIN_I = :B2 AND LVL_I = :B1 ) ) AND (AISLE_I,BIN_I,LVL_I) NOT IN (SELECT AISLE_I, BIN_I, LVL_I FROM WHSE_LOC WHERE AISLE_I = :B3 AND BIN_I = :B2 AND LVL_I = :B1 );
I have the above query in one among the packages. My DBA reports that this query is the longest running in our database from : 7.22PM to 8.15PM IST.
The record size currently is around 38500. This works when the records size is less than 5000 but when gone beyond that this fails. Can anybody help in this reg.?
The following is the description of the table:
desc whse_loc
Name Null? Type
AISLE_I NOT NULL NUMBER(3)
BIN_I NOT NULL NUMBER(3)
LVL_I NOT NULL NUMBER(2)
AREA_C NOT NULL CHAR(4)
WKSTN_C NOT NULL CHAR(4)
STRG_ZONE_I NOT NULL NUMBER(2)
SIZE_C NOT NULL CHAR(2)
PULL_SEQ_I NOT NULL NUMBER(6)
PUTAWAY_SEQ_I NOT NULL NUMBER(5)
STRG_LOC_STAT_C NOT NULL CHAR(3)
PALT_ID_CT_Q NOT NULL NUMBER(3)
PULL_PALT_ID_CT_Q NOT NULL NUMBER(3)
FLR_AIR_C NOT NULL CHAR(1)
PALT_PULL_ALLOW_F NOT NULL CHAR(1)
CTN_PULL_ALLOW_F NOT NULL CHAR(1)
SSP_PULL_ALLOW_F NOT NULL CHAR(1)
HOLD_STAT_C NOT NULL VARCHAR2(4)
HOLD_REAS_T VARCHAR2(32)
STRG_LOC_HOLD_TS DATE
HOLD_USER_ID CHAR(7)
MODF_USER_ID NOT NULL CHAR(7)
MODF_PGM_N NOT NULL CHAR(8)
MODF_TS NOT NULL DATE
DPT_Q NUMBER(1)
Pls. help me reg. optimizing the same!

Answer 1

You are accessing the table three times, and you can reduce that to one:
SQL> create table whse_loc (aisle_i, bin_i, lvl_i, area_c, wkstn_c)
  2  as
  3  select 1, 1, 1, 'A', 'A' from dual union all
  4  select 1, 1, 1, 'A', 'B' from dual union all
  5  select 1, 1, 2, 'A', 'A' from dual union all
  6  select 1, 1, 2, 'A', 'B' from dual union all
  7  select 1, 1, 2, 'A', 'C' from dual union all
  8  select 1, 1, 3, 'A', 'A' from dual union all
  9  select 1, 1, 3, 'A', 'B' from dual union all
10  select 1, 1, 3, 'A', 'C' from dual union all
11  select 1, 1, 3, 'A', 'D' from dual
12  /
Table created.
SQL> var B1 number
SQL> var B2 number
SQL> var B3 number
SQL> exec :B1 := 1; :B2 := 1; :B3 := 1
PL/SQL procedure successfully completed.
SQL> SELECT COUNT(1)
  2    FROM WHSE_LOC
  3   WHERE ( (AREA_C,WKSTN_C) IN
  4           ( SELECT AREA_C
  5                  , WKSTN_C
  6               FROM WHSE_LOC
  7              WHERE AISLE_I = :B3
  8                AND BIN_I = :B2
  9                AND LVL_I = :B1
10           )
11         )
12     AND (AISLE_I,BIN_I,LVL_I) NOT IN
13         (SELECT AISLE_I
14               , BIN_I
15               , LVL_I
16            FROM WHSE_LOC
17           WHERE AISLE_I = :B3
18             AND BIN_I = :B2
19             AND LVL_I = :B1
20         )
21  /
  COUNT(1)
         4
1 row selected.That is your current query. The last predicate can be simplified like this:
SQL> SELECT COUNT(1)
  2    FROM WHSE_LOC
  3   WHERE (AREA_C,WKSTN_C) IN
  4         ( SELECT AREA_C
  5                , WKSTN_C
  6             FROM WHSE_LOC
  7            WHERE AISLE_I = :B3
  8              AND BIN_I = :B2
  9              AND LVL_I = :B1
10         )
11     AND (  aisle_i != :B3
12         OR bin_i != :B2
13         OR lvl_i != :B1
14         )
15  /
  COUNT(1)
         4
1 row selected.Note that the query below doesn't give the right result:
SQL> SELECT COUNT(*)
  2  FROM  (SELECT DISTINCT AREA_C, WKSTN_C
  3         FROM   WHSE_LOC
  4         WHERE  AISLE_I = :B3 AND
  5                BIN_I   = :B2 AND
  6                LVL_I   = :B1)
  7  /
  COUNT(*)
         2
1 row selected.By using an analytic function, the table scans are reduced to one:
SQL> select sum(count_area_wkstn-1)
  2    from ( select whse_loc.*
  3                , count(*) over (partition by area_c, wkstn_c) count_area_wkstn
  4             from whse_loc
  5         )
  6   where aisle_i = :b3
  7     and bin_i = :b2
  8     and lvl_i = :b1
  9  /
SUM(COUNT_AREA_WKSTN-1)
                      4
1 row selected.Doing the same with other parameters:
SQL> exec :B1 := 2; :B2 := 1; :B3 := 1
PL/SQL procedure successfully completed.
SQL> SELECT COUNT(1)
  2    FROM WHSE_LOC
  3   WHERE ( (AREA_C,WKSTN_C) IN
  4           ( SELECT AREA_C
  5                  , WKSTN_C
  6               FROM WHSE_LOC
  7              WHERE AISLE_I = :B3
  8                AND BIN_I = :B2
  9                AND LVL_I = :B1
10           )
11         )
12     AND (AISLE_I,BIN_I,LVL_I) NOT IN
13         (SELECT AISLE_I
14               , BIN_I
15               , LVL_I
16            FROM WHSE_LOC
17           WHERE AISLE_I = :B3
18             AND BIN_I = :B2
19             AND LVL_I = :B1
20         )
21  /
  COUNT(1)
         5
1 row selected.
SQL> SELECT COUNT(1)
  2    FROM WHSE_LOC
  3   WHERE (AREA_C,WKSTN_C) IN
  4         ( SELECT AREA_C
  5                , WKSTN_C
  6             FROM WHSE_LOC
  7            WHERE AISLE_I = :B3
  8              AND BIN_I = :B2
  9              AND LVL_I = :B1
10         )
11     AND (  aisle_i != :B3
12         OR bin_i != :B2
13         OR lvl_i != :B1
14         )
15  /
  COUNT(1)
         5
1 row selected.
SQL> select sum(count_area_wkstn-1)
  2    from ( select whse_loc.*
  3                , count(*) over (partition by area_c, wkstn_c) count_area_wkstn
  4             from whse_loc
  5         )
  6   where aisle_i = :b3
  7     and bin_i = :b2
  8     and lvl_i = :b1
  9  /
SUM(COUNT_AREA_WKSTN-1)
                      5
1 row selected.And yet another combination, with the explain plans so you can see the number of table scans.
SQL> exec :B1 := 3; :B2 := 1; :B3 := 1
PL/SQL procedure successfully completed.
SQL> set autotrace on explain
SQL> SELECT COUNT(1)
  2    FROM WHSE_LOC
  3   WHERE ( (AREA_C,WKSTN_C) IN
  4           ( SELECT AREA_C
  5                  , WKSTN_C
  6               FROM WHSE_LOC
  7              WHERE AISLE_I = :B3
  8                AND BIN_I = :B2
  9                AND LVL_I = :B1
10           )
11         )
12     AND (AISLE_I,BIN_I,LVL_I) NOT IN
13         (SELECT AISLE_I
14               , BIN_I
15               , LVL_I
16            FROM WHSE_LOC
17           WHERE AISLE_I = :B3
18             AND BIN_I = :B2
19             AND LVL_I = :B1
20         )
21  /
  COUNT(1)
         5
1 row selected.
Execution Plan
Plan hash value: 2315582378
| Id  | Operation            | Name     | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT     |          |     1 |    90 |    13   (8)| 00:00:01 |
|   1 |  SORT AGGREGATE      |          |     1 |    90 |            |          |
|*  2 |   FILTER             |          |       |       |            |          |
|*  3 |    HASH JOIN SEMI    |          |     1 |    90 |     9  (12)| 00:00:01 |
|   4 |     TABLE ACCESS FULL| WHSE_LOC |     9 |   405 |     4   (0)| 00:00:01 |
|*  5 |     TABLE ACCESS FULL| WHSE_LOC |     1 |    45 |     4   (0)| 00:00:01 |
|*  6 |    TABLE ACCESS FULL | WHSE_LOC |     1 |    39 |     4   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - filter( NOT EXISTS (SELECT /*+ */ 0 FROM "WHSE_LOC" "WHSE_LOC"
              WHERE "AISLE_I"=TO_NUMBER(:B3) AND "BIN_I"=TO_NUMBER(:B2) AND
              "LVL_I"=TO_NUMBER(:B1) AND LNNVL("AISLE_I"<>:B1) AND LNNVL("BIN_I"<>:B2)
              AND LNNVL("LVL_I"<>:B3)))
   3 - access("AREA_C"="AREA_C" AND "WKSTN_C"="WKSTN_C")
   5 - filter("AISLE_I"=TO_NUMBER(:B3) AND "BIN_I"=TO_NUMBER(:B2) AND
              "LVL_I"=TO_NUMBER(:B1))
   6 - filter("AISLE_I"=TO_NUMBER(:B3) AND "BIN_I"=TO_NUMBER(:B2) AND
              "LVL_I"=TO_NUMBER(:B1) AND LNNVL("AISLE_I"<>:B1) AND LNNVL("BIN_I"<>:B2)
              AND LNNVL("LVL_I"<>:B3))
Note
   - dynamic sampling used for this statement
SQL> SELECT COUNT(1)
  2    FROM WHSE_LOC
  3   WHERE (AREA_C,WKSTN_C) IN
  4         ( SELECT AREA_C
  5                , WKSTN_C
  6             FROM WHSE_LOC
  7            WHERE AISLE_I = :B3
  8              AND BIN_I = :B2
  9              AND LVL_I = :B1
10         )
11     AND (  aisle_i != :B3
12         OR bin_i != :B2
13         OR lvl_i != :B1
14         )
15  /
  COUNT(1)
         5
1 row selected.
Execution Plan
Plan hash value: 3820410662
| Id  | Operation           | Name     | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT    |          |     1 |    90 |     9  (12)| 00:00:01 |
|   1 |  SORT AGGREGATE     |          |     1 |    90 |            |          |
|*  2 |   HASH JOIN SEMI    |          |     1 |    90 |     9  (12)| 00:00:01 |
|*  3 |    TABLE ACCESS FULL| WHSE_LOC |     1 |    45 |     4   (0)| 00:00:01 |
|*  4 |    TABLE ACCESS FULL| WHSE_LOC |     1 |    45 |     4   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - access("AREA_C"="AREA_C" AND "WKSTN_C"="WKSTN_C")
   3 - filter("AISLE_I"<>TO_NUMBER(:B3) OR "BIN_I"<>TO_NUMBER(:B2) OR
              "LVL_I"<>TO_NUMBER(:B1))
   4 - filter("AISLE_I"=TO_NUMBER(:B3) AND "BIN_I"=TO_NUMBER(:B2) AND
              "LVL_I"=TO_NUMBER(:B1))
Note
   - dynamic sampling used for this statement
SQL> select sum(count_area_wkstn-1)
  2    from ( select whse_loc.*
  3                , count(*) over (partition by area_c, wkstn_c) count_area_wkstn
  4             from whse_loc
  5         )
  6   where aisle_i = :b3
  7     and bin_i = :b2
  8     and lvl_i = :b1
  9  /
SUM(COUNT_AREA_WKSTN-1)
                      5
1 row selected.
Execution Plan
Plan hash value: 1194892149
| Id  | Operation            | Name     | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT     |          |     1 |    52 |     5  (20)| 00:00:01 |
|   1 |  SORT AGGREGATE      |          |     1 |    52 |            |          |
|*  2 |   VIEW               |          |     9 |   468 |     5  (20)| 00:00:01 |
|   3 |    WINDOW SORT       |          |     9 |   405 |     5  (20)| 00:00:01 |
|   4 |     TABLE ACCESS FULL| WHSE_LOC |     9 |   405 |     4   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - filter("AISLE_I"=TO_NUMBER(:B3) AND "BIN_I"=TO_NUMBER(:B2) AND
              "LVL_I"=TO_NUMBER(:B1))
Note
   - dynamic sampling used for this statementRegards,
Rob.