How to tune this smiple SQL (takes long time to come up with results)

Question

the following SQL is very slow as it takes one day to complete...
select A.* from (SELECT a.n_agent_no, a.v_agent_code, a.n_channel_no, v_iden_no, a.n_cust_ref_no, a.v_agent_type, a.v_company_code,
a.v_company_branch, a.v_it_no, bfn_get_agent_name(a.n_agent_no) agentname,
PKG_AGE__TAX.GET_TAX_AMT(:P_FROM_DATE,:P_TO_DATE,:P_LOB_CODE,A.N_AGENT_NO) comm,
c.v_ird_region
FROM agent_master a, agent_lob b, agency_region c
WHERE a.n_agent_no = b.n_agent_no
AND a.v_agency_region = c.v_agency_region
--AND :p_lob_code = DECODE(:p_lob_code,'ALL', 'ALL',b.v_line_of_business)
--AND :p_channel_no = DECODE(:p_channel_no,1000, 1000,a.n_channel_no)
--AND :p_agency_group = DECODE(:p_agency_group,'ALL', 'ALL',c.v_ird_region)
group by a.n_agent_no, a.v_agent_code, a.n_channel_no, v_iden_no, a.n_cust_ref_no, a.v_agent_type, a.v_company_code, a.v_company_branch, a.v_it_no, bfn_get_agent_name(a.n_agent_no) ,
BPG_AGENCY_GEN_ACL_TAX.BFN_GET_TAX_AMOUNT(:P_FROM_DATE,:P_TO_DATE,:P_LOB_CODE,A.N_AGENT_NO),
c.v_ird_region
ORDER BY c.v_ird_region, a.v_agent_code DESC)
A
WHERE (COMM < :P_VAL_IND OR COMM >=:P_VAL_IND1);
. .it should return all the agents with commission based on the date parameter... data is less then 50 K inside all
the tables...
the version is Oracle9i Enterprise Edition Release 9.2.0.5.0
SQL>  explain plan for
  2   select A.* from (SELECT a.n_agent_no, a.v_agent_code, a.n_channel_no, v_iden_no, a.n_cust_ref_
no, a.v_agent_type, a.v_company_code,
  3  a.v_company_branch, a.v_it_no, bfn_get_agent_name(a.n_agent_no) agentname,
  4  BPG_AGENCY_GEN_ACL_TAX.BFN_GET_TAX_AMOUNT(:P_FROM_DATE,:P_TO_DATE,:P_LOB_CODE,A.N_AGENT_NO) com
m,
  5  c.v_ird_region
  6  FROM ammm_agent_master a, ammt_agent_lob b, gnlu_agency_region c
  7  WHERE a.n_agent_no = b.n_agent_no
  8  AND a.v_agency_region = c.v_agency_region
  9  --AND :p_lob_code = DECODE(:p_lob_code,'ALL', 'ALL',b.v_line_of_business)
10  --AND :p_channel_no = DECODE(:p_channel_no,1000, 1000,a.n_channel_no)
11  --AND :p_agency_group = DECODE(:p_agency_group,'ALL', 'ALL',c.v_ird_region)
12  group by a.n_agent_no, a.v_agent_code, a.n_channel_no, v_iden_no, a.n_cust_ref_no, a.v_agent_ty
pe, a.v_company_code, a.v_company_branch, a.v_it_no, bfn_get_agent_name(a.n_agent_no) ,
13  BPG_AGENCY_GEN_ACL_TAX.BFN_GET_TAX_AMOUNT(:P_FROM_DATE,:P_TO_DATE,:P_LOB_CODE,A.N_AGENT_NO),
14  c.v_ird_region
15  ORDER BY c.v_ird_region, a.v_agent_code DESC)
16  A
17  WHERE (COMM < :P_VAL_IND OR COMM >=:P_VAL_IND1);
Explained.
SQL>  select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
| Id  | Operation                       |  Name               | Rows  | Bytes |TempSpc| Cost (%CPU)|
|   0 | SELECT STATEMENT                |                     | 13315 |    27M|       |   859  (63)|
|   1 |  VIEW                           |                     | 13315 |    27M|       |            |
|   2 |   SORT GROUP BY                 |                     | 13315 |   936K|  2104K|   859  (63)|
|   3 |    HASH JOIN                    |                     | 13315 |   936K|       |   641  (81)|
|   4 |     MERGE JOIN                  |                     |  3118 |   204K|       |   512  (86)|
|   5 |      TABLE ACCESS BY INDEX ROWID| AGENCY_REGION  |     8 |   152 |       |     3  (34)|
|   6 |       INDEX FULL SCAN           | SYS_C004994         |     8 |       |       |     2  (50)|
|   7 |      SORT JOIN                  |                     |  3142 |   147K|       |   510  (86)|
|   8 |       TABLE ACCESS FULL         | AGENT_MASTER   |  3142 |   147K|       |   506  (86)|
|   9 |     TABLE ACCESS FULL           | AGENT_LOB      |   127K|   623K|       |   102  (50)|
Note: PLAN_TABLE' is old version
17 rows selected.
..This is the only information i can get as i cannot access over database server (user security limitation)...
Thank You

Answer 1

Try to remove this:
ORDER BY c.v_ird_region, a.v_agent_code DESCOr move it to the end of entire query.
Edited by: Random on Jun 19, 2009 1:01 PM