Performance tuning on a query

Question

I am working on fine tuning below query.
SELECT SEGMENT1
FROM MTL_SYSTEM_ITEMS
WHERE ORGANIZATION_ID = 100
AND INVENTORY_ITEM_ID = :a
MTL_SYSTEM_ITEMS have 8 million records. This query is in a function that gets called probably a million times a day.
What I am thinking to do is to create a view on mtl_system_items table where organization_id = 100. Now if I use the below view, do you think the query will execute faster?
SELECT SEGMENT1
FROM MTL_SYSTEM_ITEMS_VIEW
WHERE INVENTORY_ITEM_ID = :a

Answer 1

Check your numbers of parsing for these particular query after each execution.
e.g,
SQL>SELECT * FROM(
  2  SELECT parse_calls*executions Product, parse_calls Parses
  3     ,executions Execs, sql_text FROM v$sqlarea ORDER BY 1 DESC)
  4  WHERE ROWNUM <= 50
  5* ORDER BY parses DESC
SQL> /
   PRODUCT     PARSES      EXECS SQL_TEXT
   2608960        155      16832 SELECT  apl_dnum ,COUNT(*)  "Numbers" ,SUM(q3d_amount) "Amount" ,ddate FRO
   7661664        111      69024 SELECT COUNT(*)   FROM Q3_LODGMENT_DTL  WHERE APL_DNUM = :b1
   1412853         51      27703 SELECT ZONE_DESC_SHORT   FROM ZONE_STP  WHERE ZONE_CODE = :b1
50 rows selected.If yours session_cached_cursors parameter have the capibilty to caching more SQL statements per session then it will reduce re-parsing.Though bind variables in
SQL code reduce parsing.
Check yours index exist,check out yours network flow,yours DBA gave you very nice job but there is no hard and fast thumb role to identify exactly what causes to degrade this specific query.
Khurram