Tuning SQL Query for base tables

Question

Hi,
Can any please help me to tune the below query...... there is full table scan for po_action_history table
SELECT DISTINCT
     DECODE(hr.full_name,'Default Buyer, Purchasing','PCH',
'Default Buyer, Travel','TRV',
'Purchase Order, Rapid','RPO',
'Data Interchange, Electronic','EDI',fuser1.user_name) BUYER_ID,
poa.attribute1 BUYER_GROUP,
     poa.attribute2 BUYER_SUBGROUP
FROM      po.po_action_history ac1,
     po.po_headers_all ph,
     po.po_agents poa,
     hr.per_all_people_f hr,
     applsys.fnd_user fuser1
WHERE ph.po_header_id = ac1.object_id
AND      ac1.object_type_code = 'PO'
AND      ac1.action_code = 'APPROVE'
AND      sequence_num =(SELECT MIN(ac2.sequence_num)
               FROM po.po_action_history ac2,
                    applsys.fnd_user fuser2
WHERE ph.po_header_id = ac2.object_id
AND      ac2.object_type_code = 'PO'
AND      ac2.action_code = 'APPROVE'
AND      ac2.last_updated_by = fuser2.user_id)
--AND  ac1.last_updated_by = fuser1.user_id
AND      ph.agent_id = poa.agent_id
AND      ph.agent_id = hr.person_id
AND      hr.person_id = fuser1.employee_id
AND      hr.effective_end_date > sysdate
AND trunc(ac1.last_update_date) between '01-JAN-08' and '07-JAN-08'
ORDER BY poa.attribute1
Explain Plan
PLAN_TABLE_OUTPUT
Plan hash value: 3325319312
Id Operation Name Rows
Bytes Cost (%CPU) Time
PLAN_TABLE_OUTPUT
| 0 | SELECT STATEMENT | | 27 |
2754 | 38963 (3) | 00:07:48 |
| 1 | SORT UNIQUE | | 27 |
2754 | 38962 (3) | 00:07:48 |
|* 2 | FILTER | | |
| | |
|* 3 | HASH JOIN | | 37 |
3774 | 36308 (3) | 00:07:16 |
PLAN_TABLE_OUTPUT
| 4 | TABLE ACCESS BY INDEX ROWID | FND_USER | 1 |
13 | 2 (0) | 00:00:01 |
| 5 | NESTED LOOPS | | 37 |
3293 | 36303 (3) | 00:07:16 |
| 6 | NESTED LOOPS | | 88 |
6688 | 36180 (3) | 00:07:15 |
| 7 | NESTED LOOPS | | 88 |
PLAN_TABLE_OUTPUT
3960 | 35916 (3) | 00:07:11 |
|* 8 | TABLE ACCESS FULL | PO_ACTION_HISTORY | 2110 |
71740 | 32478 (3) | 00:06:30 |
| 9 | TABLE ACCESS BY INDEX ROWID | PO_HEADERS_ALL | 1 |
11 | 2 (0) | 00:00:01 |
|* 10 | INDEX UNIQUE SCAN | PO_HEADERS_U1 | 1 |
| 1 (0) | 00:00:01 |
PLAN_TABLE_OUTPUT
| 11 | SORT AGGREGATE | | 1 |
36 | | |
| 12 | NESTED LOOPS | | 1 |
36 | 6 (0) | 00:00:01 |
|* 13 | TABLE ACCESS BY INDEX ROWID| PO_ACTION_HISTORY | 1 |
31 | 6 (0) | 00:00:01 |
|* 14 | INDEX RANGE SCAN | PO_ACTION_HISTORY_N1 | 5 |
| 3 (0) | 00:00:01 |
PLAN_TABLE_OUTPUT
|* 15 | INDEX UNIQUE SCAN | FND_USER_U1 | 1 |
5 | 0 (0) | 00:00:01 |
| 16 | TABLE ACCESS BY INDEX ROWID | PER_ALL_PEOPLE_F | 1 |
31 | 3 (0) | 00:00:01 |
|* 17 | INDEX RANGE SCAN | PER_PEOPLE_F_PK | 1 |
| 2 (0) | 00:00:01 |
|* 18 | INDEX RANGE SCAN | FND_USER_N1 | 1 |
PLAN_TABLE_OUTPUT
| 1 (0) | 00:00:01 |
| 19 | TABLE ACCESS FULL | PO_AGENTS | 183 |
2379 | 4 (0) | 00:00:01 |
Predicate Information (identified by operation id):
PLAN_TABLE_OUTPUT
2 - filter(TO_DATE('01-JAN-08')<=TO_DATE('07-JAN-08'))
3 - access("PH"."AGENT_ID"="POA"."AGENT_ID")
8 - filter("AC1"."ACTION_CODE"='APPROVE' AND "AC1"."OBJECT_TYPE_CODE"='PO'AND
TRUNC(INTERNAL_FUNCTION("AC1"."LAST_UPDATE_DATE"))>='01-JAN-08' AND
TRUNC(INTERNAL_FUNCTION("AC1"."LAST_UPDATE_DATE"))<='07-JAN-08')
10 - access("PH"."PO_HEADER_ID"="AC1"."OBJECT_ID")
PLAN_TABLE_OUTPUT
filter("SEQUENCE_NUM"= (SELECT MIN("AC2"."SEQUENCE_NUM") FROM "APPLSYS"."FND_USER"
"FUSER2","PO"."PO_ACTION_HISTORY" "AC2" WHERE "AC2"."OBJECT_ID"=:B1 AND "AC2"."ACTION_CODE"='APPROVE'
AND "AC2"."OBJECT_TYPE_CODE"='PO' AND "AC2"."LAST_UPDATED_BY"="FUSER2"."USER_ID"))
13 - filter("AC2"."ACTION_CODE"='APPROVE' AND "AC2"."OBJECT_TYPE_CODE"='PO')
14 - access("AC2"."OBJECT_ID"=:B1)
PLAN_TABLE_OUTPUT
15 - access("AC2"."LAST_UPDATED_BY"="FUSER2"."USER_ID")
17 - access("PH"."AGENT_ID"="PERSON_ID" AND "EFFECTIVE_END_DATE">SYSDATE@!)
filter("EFFECTIVE_END_DATE">SYSDATE@!)
18 - access("PERSON_ID"="FUSER1"."EMPLOYEE_ID")
Thanks

Answer 1

Hi,
any help for the above issue.