QUERY CLARIFICATION RQD : gurus, experts pls help

Question

Hai,
I am facing problem in performance of the query. sample scenario i have created here pls help me to solve
**VEH_MAIN* TABLE (MASTER TABLE)*
CREATE TABLE VEH_MAIN
   (     VIP_MOT_IND VARCHAR2(10 BYTE),
     VIP_IND NUMBER(10,0)
Insert into VEH_MAIN (VIP_MOT_IND,VIP_IND) values ('MOT01',1);
Insert into VEH_MAIN (VIP_MOT_IND,VIP_IND) values ('MOT02',5);
Insert into VEH_MAIN (VIP_MOT_IND,VIP_IND) values ('M0T03',1);
Insert into VEH_MAIN (VIP_MOT_IND,VIP_IND) values ('MOT01',2);
Insert into VEH_MAIN (VIP_MOT_IND,VIP_IND) values ('MOT02',6);
Insert into VEH_MAIN (VIP_MOT_IND,VIP_IND) values ('MOT01',3);
Insert into VEH_MAIN (VIP_MOT_IND,VIP_IND) values ('MOT01',4);
**VEH_ENGINE_SUB* (table for engine subclass)*
  CREATE TABLE VEH_ENG_SUB
   (     ENG_SUBCLASS VARCHAR2(50 BYTE),
     ENG_MOT_IND VARCHAR2(10 BYTE)
Insert into VEH_ENG_SUB (ENG_SUBCLASS,ENG_MOT_IND) values ('ENGSUB001','MOT01');
Insert into VEH_ENG_SUB (ENG_SUBCLASS,ENG_MOT_IND) values ('ENGSUB001','MOT02');
*VEH_ENG_IND( Detail table for engine subclass)*
  CREATE TABLE VEH_ENG_IND
   (     "ENG_SUBCLASS" VARCHAR2(50 BYTE),
     "ENG_IND" VARCHAR2(10 BYTE)
Insert into VEH_ENG_IND (ENG_SUBCLASS,ENG_IND) values ('ENGSUB001','1');
Insert into VEH_ENG_IND (ENG_SUBCLASS,ENG_IND) values ('ENGSUB001','2');
*VEH_AXIS( Master table for Engine Axis)*
CREATE TABLE VEH_AXIS
   (     ENG_AXIS VARCHAR2(50 BYTE),
     AXIS_MOT_IND VARCHAR2(10 BYTE)
Insert into VEH_AXIS (ENG_AXIS,AXIS_MOT_IND) values ('ENGAXIS001','MOT01');
Insert into VEH_AXIS (ENG_AXIS,AXIS_MOT_IND) values ('ENGAXIS002','MOT02');
*VEH_AXIS_IND( Details table for engine axis)*
CREATE TABLE VEH_AXIS_IND
   (     ENG_AXIS VARCHAR2(50 BYTE),
     ENG_IND VARCHAR2(10 BYTE)
Insert into VEH_AXIS_IND (ENG_AXIS,ENG_IND) values ('ENGAXIS001','1');
Insert into VEH_AXIS_IND (ENG_AXIS,ENG_IND) values ('ENGAXIS001','2');
Insert into VEH_AXIS_IND (ENG_AXIS,ENG_IND) values ('ENGAXIS001','3');
Insert into VEH_AXIS_IND (ENG_AXIS,ENG_IND) values ('ENGAXIS001','4');
Insert into VEH_AXIS_IND (ENG_AXIS,ENG_IND) values ('ENGAXIS002','5');
Insert into VEH_AXIS_IND (ENG_AXIS,ENG_IND) values ('ENGAXIS002','6');
Condition 1
if i select only ENGINE_SUBCLASS='ENGSUB001' then
SELECT  vip_mot_ind,vip_ind
FROM veh_main V,
veh_eng_sub vsub,
veh_eng_ind  vind
WHERE (v.vip_mot_ind= vsub.eng_mot_ind
and   v.vip_ind=vind.eng_ind
and    vsub.eng_subclass= vind.eng_subclass
AND vsub.eng_subclass='ENGSUB001' )output is
MOT01     1
MOT01     2
Condition 2:if i select only the Engine Axis='ENGAXIS002' then the
SELECT  vip_mot_ind,vip_ind
FROM veh_main V,
veh_axis  vaxis,
veh_axis_ind vaind
WHERE  v.vip_mot_ind= vaxis.axis_mot_ind
and   v.vip_ind= vaind.eng_ind
and   vaind.eng_axis= vaxis.eng_axis
and   vaxis.eng_axis='ENGAXIS002';MOT02     5
MOT02     6
Condition 3:
BOTH ENGINE AXIS AND ENGINE SUBCLASS
SELECT  vip_mot_ind,vip_ind
FROM veh_main V,
veh_eng_sub vsub,
veh_eng_ind  vind,
veh_axis  vaxis,
veh_axis_ind vaind
WHERE (v.vip_mot_ind= vsub.eng_mot_ind
and   v.vip_ind=vind.eng_ind
and    vsub.eng_subclass= vind.eng_subclass
AND vsub.eng_subclass='ENGSUB001' )
AND  ( v.vip_mot_ind= vaxis.axis_mot_ind
and   v.vip_ind= vaind.eng_ind
and   vaind.eng_axis= vaxis.eng_axis
and   vaxis.eng_axis='ENGAXIS002');Null values returned. this is correct.
But the query PERFORMANCE fails in OR CONDITON as below
Condition 4;
SELECT  vip_mot_ind,vip_ind
FROM veh_main V,
veh_eng_sub vsub,
veh_eng_ind  vind,
veh_axis  vaxis,
veh_axis_ind vaind
WHERE (v.vip_mot_ind= vsub.eng_mot_ind
and   v.vip_ind=vind.eng_ind
and    vsub.eng_subclass= vind.eng_subclass
AND vsub.eng_subclass='ENGSUB001' )
OR  ( v.vip_mot_ind= vaxis.axis_mot_ind
and   v.vip_ind= vaind.eng_ind
and   vaind.eng_axis= vaxis.eng_axis
and   vaxis.eng_axis='ENGAXIS002');output
MOT02     5
MOT02     5
MOT02     5
MOT02     5
MOT02     6
MOT02     6
MOT02     6
MOT02     6
MOT01     1
MOT01     1
MOT01     1
MOT01     1
MOT01     1
MOT01     1
MOT01     1
MOT01     1
MOT01     1
MOT01     1
MOT01     1
MOT01     1
MOT01     2
MOT01     2
MOT01     2
MOT01     2
MOT01     2
MOT01     2
MOT01     2
MOT01     2
MOT01     2
MOT01     2
MOT01     2
MOT01     2
This is sample example. when i implement in huge table with partition this scennario takes much time even 2 hours to run.
i want the output must be as below if i use OR condition like condition 4
MOT01     1
MOT01     2
MOT02     5
MOT02     6
Gurus and experts pls help me to solve this problem. Dont give any suggestion like
SELECT  vip_mot_ind,vip_ind
FROM veh_main V,
veh_axis  vaxis,
veh_axis_ind vaind
WHERE  v.vip_mot_ind= vaxis.axis_mot_ind
and   v.vip_ind= vaind.eng_ind
and   vaind.eng_axis= vaxis.eng_axis
and   vaxis.eng_axis='ENGAXIS002'
union
SELECT  vip_mot_ind,vip_ind
FROM veh_main V,
veh_eng_sub vsub,
veh_eng_ind  vind
WHERE (v.vip_mot_ind= vsub.eng_mot_ind
and   v.vip_ind=vind.eng_ind
and    vsub.eng_subclass= vind.eng_subclass
AND vsub.eng_subclass='ENGSUB001' )
}this will give correct result...
MOT01     1
MOT01     2
MOT02     5
MOT02     6
but the problem is we cannot implement this in query. because query get framed at runtime there will be so many implement has to be done. other than UNION pls give me more suggesion
waiting..
S
Edited by: A Beginner on Sep 11, 2010 12:51 AM

Answer 1

create a view v1 with all the joins
select * from v1 where eng_subclass='ENGSUB001'
union
select * from v1 where eng_axis='ENGAXIS002'
If you really do not like the direct access with union, try this
select * from v1
where vsub_PK in (select vsub_PK from v1 where eng_subclass='ENGSUB001' )
OR vsub_PK in (select vsub_PK from v1 where eng_axis='ENGAXIS002')
--vsub_PK is the primary key of table vsub