Need help for performance tunning

Question

Hello,
I have 16K records return by query, it takes long time to proceed for 7K it takes 7.5 sec.
Note: I used all seeded tables only.
If possible please help me to tune it.
SELECT       msi.inventory_item_id,msi.segment1,msi.rimary_uom_code , msi.primary_unit_of_measure
FROM  mtl_system_items_b msi, qp_list_lines qpll,qp_pricing_attributes qppr,
          mtl_category_sets_tl mcs,mtl_category_sets_b mcsb,
          mtl_categories_b mc, mtl_item_categories mcb
WHERE     msi.enabled_flag = 'Y'
     AND qpll.list_line_id = qppr.list_line_id
     AND qppr.product_attr_value = TO_CHAR (msi.inventory_item_id(+))
     AND qppr.product_uom_code = msi.primary_uom_code
     AND mc.category_id = mcb.category_id
     AND msi.inventory_item_id = mcb.inventory_item_id
     AND msi.organization_id = mcb.organization_id
     AND TRUNC (SYSDATE) BETWEEN NVL (qpll.start_date_active,TRUNC (SYSDATE)) AND NVL (qpll.end_date_active,TRUNC (SYSDATE))
     AND mcs.category_set_name = 'LSS SALES CATEGORY'
     AND mcs.language = 'US'
     AND mcs.category_set_id = mcsb.category_set_id
     AND mcsb.structure_id = mc.structure_id
     AND msi.organization_id = :p_organization_id
     AND qpll.list_header_id = :p_price_list_id
     AND mcb.category_id = :p_category_id;
Thanks and regards
Akil.

Answer 1

Thanks Helios ,
here is answers
Databse version
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit  
PL/SQL Release 11.1.0.7.0
explain plan
| Id  | Operation                       | Name                     | Rows  | Bytes | Cost (%CPU)|
| 
0 | SELECT STATEMENT              
|                          |   
1 |   149 |  9439 
(1)|
| 
1 |  NESTED LOOPS                   |                          |     1 | 
149 |  9439   (1)|
|*
2 |   HASH JOIN OUTER               |                          |     1 | 
135 |  9437   (1)|
|*
3 |    HASH JOIN                    |                          |     1 |  
71 |  9432   (1)|
| 
4 |     NESTED LOOPS                |                          |     2 |  
76 |    53   (0)|
|*
5 |      TABLE ACCESS BY INDEX
ROWID| QP_LIST_LINES            |     2 |  
44 |    49   (0)|
|*
6 |       INDEX SKIP SCAN           | QP_LIST_LINES_N2         | 
702 |       |    20 
(0)|
|*
7 |      INDEX RANGE SCAN           | QP_PRICING_ATTRIBUTES_N3 |     1 |  
16 |     2   (0)|
|*
8 |     TABLE ACCESS BY INDEX
ROWID | MTL_SYSTEM_ITEMS_B       | 46254
|  1490K|
9378   (1)|
|*
9 |      INDEX RANGE SCAN           | MTL_SYSTEM_ITEMS_B_N9    | 46254 |       | 
174   (1)|
|
10 |    TABLE ACCESS FULL            | XX_WEB_ITEM_IMAGE_TBL    | 
277 | 17728 |     5   (0)|
|* 11 |   INDEX RANGE SCAN              | MTL_ITEM_CATEGORIES_U1   |   
1 |    14 |     2 
(0)|
Predicate Information (identified
by operation id):
2 -
access("XWIIT"."IMAGE_CODE"(+)="MSI"."SEGMENT1")
3 -
access("QPPR"."PRODUCT_ATTR_VALUE"=TO_CHAR("MSI"."INVENTORY_ITEM_ID")
AND
"QPPR"."PRODUCT_UOM_CODE"="MSI"."PRIMARY_UOM_CODE")
5 - filter(NVL("QPLL"."START_DATE_ACTIVE",TRUNC(SYSDATE@!))<=TRUNC(SYSDATE@!)
AND
NVL("QPLL"."END_DATE_ACTIVE",TRUNC(SYSDATE@!))>=TRUNC(SYSDATE@!))
6 -
access("QPLL"."LIST_HEADER_ID"=TO_NUMBER(:P_PRICE_LIST_ID))
filter("QPLL"."LIST_HEADER_ID"=TO_NUMBER(:P_PRICE_LIST_ID))
7 -
access("QPLL"."LIST_LINE_ID"="QPPR"."LIST_LINE_ID")
filter("QPPR"."PRODUCT_UOM_CODE" IS NOT NULL)
8 - filter("MSI"."ENABLED_FLAG"='Y')
9 - access("MSI"."ORGANIZATION_ID"=TO_NUMBER(:P_ORGANIZATION_ID))
11 -
access("MCB"."ORGANIZATION_ID"=TO_NUMBER(:P_ORGANIZATION_ID)
AND
"MSI"."INVENTORY_ITEM_ID"="MCB"."INVENTORY_ITEM_ID"
AND
"MCB"."CATEGORY_ID"=TO_NUMBER(:P_CATEGORY_ID))
       filter("MCB"."CATEGORY_ID"=TO_NUMBER(:P_CATEGORY_ID))
Note
- 'PLAN_TABLE' is old version
TKprof Plan
TKPROF: Release 11.1.0.7.0 - Production on Fri Nov 15 06:12:26 2013
Copyright (c) 1982, 2007, Oracle.  All rights reserved.
Trace file: LSSD_ora_19760.trc
Sort options: default
count    = number of times OCI procedure was executed
cpu      = cpu time in seconds executing
elapsed  = elapsed time in seconds executing
disk     = number of physical reads of buffers from disk
query    = number of buffers gotten for consistent read
current  = number of buffers gotten in current mode (usually for update)
rows     = number of rows processed by the fetch or execute call
SELECT msi.inventory_item_id,
       msi.segment1,
       primary_uom_code,
       primary_unit_of_measure,
       xwiit.image_url
  FROM mtl_system_items_b msi,
       qp_list_lines qpll,
       qp_pricing_attributes qppr,
       mtl_item_categories mcb,
       xx_web_item_image_tbl xwiit
WHERE     msi.enabled_flag = 'Y'
       AND qpll.list_line_id = qppr.list_line_id
       AND qppr.product_attr_value = TO_CHAR (msi.inventory_item_id)
       AND qppr.product_uom_code = msi.primary_uom_code
       AND msi.inventory_item_id = mcb.inventory_item_id
       AND msi.organization_id = mcb.organization_id
       AND TRUNC (SYSDATE) BETWEEN NVL (qpll.start_date_active,
                                        TRUNC (SYSDATE))
                               AND NVL (qpll.end_date_active,
                                        TRUNC (SYSDATE))
       AND xwiit.image_code(+) = msi.segment1
       AND msi.organization_id = :p_organization_id
       AND qpll.list_header_id = :p_price_list_id
       AND mcb.category_id = :p_category_id
call     count       cpu    elapsed       disk      query    current        rows
Parse        2      0.00       0.00          0          0          0           0
Execute      2      0.00       0.00          0          0          0           0
Fetch        2      3.84       3.85          0     432560          0        1002
total        6      3.84       3.85          0     432560          0        1002
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 173 
Rows     Row Source Operation
    501  NESTED LOOPS  (cr=216280 pr=0 pw=0 time=115 us cost=9439 size=149 card=1)
   2616   HASH JOIN OUTER (cr=211012 pr=0 pw=0 time=39 us cost=9437 size=135 card=1)
  78568    HASH JOIN  (cr=210997 pr=0 pw=0 time=3786 us cost=9432 size=71 card=1)
  78571     NESTED LOOPS  (cr=29229 pr=0 pw=0 time=35533 us cost=53 size=76 card=2)
  78571      TABLE ACCESS BY INDEX ROWID QP_LIST_LINES (cr=9943 pr=0 pw=0 time=27533 us cost=49 size=44 card=2)
226733       INDEX SKIP SCAN QP_LIST_LINES_N2 (cr=865 pr=0 pw=0 time=4122 us cost=20 size=0 card=702)(object id 99730)
  78571      INDEX RANGE SCAN QP_PRICING_ATTRIBUTES_N3 (cr=19286 pr=0 pw=0 time=0 us cost=2 size=16 card=1)(object id 99733)
128857     TABLE ACCESS BY INDEX ROWID MTL_SYSTEM_ITEMS_B (cr=181768 pr=0 pw=0 time=9580 us cost=9378 size=1526382 card=46254)
128857      INDEX RANGE SCAN MTL_SYSTEM_ITEMS_B_N9 (cr=450 pr=0 pw=0 time=1657 us cost=174 size=0 card=46254)(object id 199728)
    277    TABLE ACCESS FULL XX_WEB_ITEM_IMAGE_TBL (cr=15 pr=0 pw=0 time=22 us cost=5 size=17728 card=277)
    501   INDEX RANGE SCAN MTL_ITEM_CATEGORIES_U1 (cr=5268 pr=0 pw=0 time=0 us cost=2 size=14 card=1)(object id 99557)
Note: I modified query and it gives good result, now it takes 3 to 4 sec for 16000 records.
If possible can you plz explain what we have to take care while doing performance tunning
I am a fresher so don't have that much idea.
and also Thanks Hussein for your replay