Same query returns differenent result sets in oracle 9i and 10g

Question

Could anyone please clarify the issue i am having on a query. I have query that is returning around 2000 records in oracle db 9.2.0.8.0, at the same time with same data if run on 10.2.0.1.0 is returning only 12 records.
what might be the reason for this descrepancy, is something in 9i is considered differently in 10g?
Here is the query.
SELECT
0
,ot_req_head.rh_sys_id
,ot_req_head.rh_comp_code
,ot_req_head.rh_txn_code
,ot_req_head.rh_no
,ot_req_head.rh_appr_uid
,'Action to be taken' action
,ot_req_head.rh_appr_dt
,NULL AUTH_TO_UID
,NULL
,NULL
,NULL from_remarks
,NULL
,NULL
,'REQ'
,ot_req_head.rh_amd_no
,ot_req_head.rh_amd_dt
,ot_req_head.rh_cr_uid
,DECODE(ot_req_head.rh_charge_area_num,6,ot_req_head.rh_locn_code,1,ot_req_head.rh_charge_code,NULL)
,ot_req_head.rh_cr_dt
,NULL
FROM
orioni.om_txn_setup,
orioni.ot_req_head,
iscoit.isco_txn_auth,
SELECT DISTINCT rh_sys_id
FROM orioni.pending_mr
)pending_mr
WHERE
ot_req_head.rh_txn_code=txns_txn_code
AND
auth_comp_code(+)=ot_req_head.rh_comp_code
AND
auth_action_to_type(+) IS NULL
AND
auth_head_sys_id(+)=ot_req_head.rh_sys_id
AND
auth_txn_code(+)=ot_req_head.rh_txn_code
AND
ot_req_head.rh_clo_status IS NULL
AND
ot_req_head.rh_comp_code='001'
AND
txns_txnp_code='PURREQ'
AND
txns_values='N'
AND
ot_req_head.rh_appr_status=3
AND
ot_req_head.rh_sys_id = pending_mr.rh_sys_id
AND NOT EXISTS
SELECT 'X'
FROM
iscoit.isco_txn_auth A
WHERE
a.auth_head_sys_id = isco_txn_auth.auth_head_sys_id
AND
a.auth_action_from_uid = ot_req_head.rh_appr_uid
AND
a.auth_action_from_type = 'Action to be taken'
AND
a.auth_action_from_dt = ot_req_head.rh_appr_dt
AND
NVL(a.auth_txn_amend_no,0) = NVL(ot_req_head.rh_amd_no,0)
AND
a.auth_action_to_type = 'REJECT'
AND
ot_req_head.rh_cr_dt > TO_DATE('16-MAR-2008','DD-MON-YYYY')
Edited by: unus on Oct 19, 2009 3:56 AM
Edited by: unus on Oct 19, 2009 4:18 AM

Answer 1

Here's what I got on 9i and 10G:
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.8.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.8.0 - Production
SQL> CREATE TABLE T_1(VAL1 NUMBER,VAL2 VARCHAR2(10));
Table created.
SQL> CREATE TABLE T_2(VAL1 NUMBER,VAL2 VARCHAR2(10));
Table created.
SQL> INSERT INTO T_1 VALUES(1,'FIRST');
1 row created.
SQL> INSERT INTO T_1 VALUES(2,'SECOND');
1 row created.
SQL> INSERT INTO T_2 VALUES(1,'FIRST');
1 row created.
SQL> INSERT INTO T_2 VALUES(2,'SECOND');
1 row created.
SQL> INSERT INTO T_1 VALUES(3,'THIRD');
1 row created.
SQL> INSERT INTO T_1 VALUES(4,'FOURTH');
1 row created.
SQL> INSERT INTO T_1 VALUES(5,'FIFTH');
1 row created.
SQL> commit;
Commit complete.
SQL> SELECT A.VAL1,B.VAL1 FROM
  2  T_1 A,T_2 B
  3  WHERE A.VAL1=B.VAL1;
     VAL1      VAL1
        1         1
        2         2
SQL> SELECT A.VAL1,B.VAL1 FROM
  2  T_1 A,T_2 B
  3  WHERE A.VAL1=B.VAL1(+);
     VAL1      VAL1
        1         1
        2         2
        3
        4
        5
SQL> SELECT A.VAL1,B.VAL1 FROM
  2  T_1 A,T_2 B
  3  WHERE A.VAL1=B.VAL1(+)
  4  AND
  5  NOT EXISTS (SELECT 'X' FROM t_2 C WHERE c.val1=b.val1);
     VAL1      VAL1
        3
        4
        5
SQL> select name, value from v$parameter where name like '%optimizer%' or name like '%cursor_sharing
NAME                                                             VALUE
cursor_sharing                                                   EXACT
optimizer_features_enable                                        9.2.0
optimizer_mode                                                   CHOOSE
optimizer_max_permutations                                       2000
optimizer_index_cost_adj                                         100
optimizer_index_caching                                          0
optimizer_dynamic_sampling                                       1
-- 10G
Verbonden met:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
SQL> SELECT A.VAL1,B.VAL1 FROM
  2  T_1 A,T_2 B
  3  WHERE A.VAL1=B.VAL1;
      VAL1       VAL1
         1          1
         2          2
SQL> SELECT A.VAL1,B.VAL1 FROM
  2  T_1 A,T_2 B
  3  WHERE A.VAL1=B.VAL1(+);
      VAL1       VAL1
         1          1
         2          2
         5
         4
         3
SQL> SELECT A.VAL1,B.VAL1 FROM
  2  T_1 A,T_2 B
  3  WHERE A.VAL1=B.VAL1(+)
  4  AND
  5  NOT EXISTS (SELECT 'X' FROM t_2 C WHERE c.val1=b.val1);
      VAL1       VAL1
         3
         4
         5( Please use the tag before and after your example, so we're sure we're looking at your complete example )