How do i avoid OR cluase in this query

Question

Can somebody please tell me how i can re-write the query to avoid the OR clause
so that i can use the index on WRKG38_VIN_FULL_C
we have following indexes on fact table.
1. composite index on (WRKG01_ORD_PROD_SRC_C and WRKG01_ORD_PROD_ORD_ID_C)
2. non-unique index on WRKG38_VIN_FULL_C
select fact.* from MWRKG01_GEVEXT_F fact, MWRKG38_DRIVER_ODS driv
where ( fact.WRKG01_ORD_PROD_SRC_C = driv.WRKG38_ORD_PROD_SRC_C) AND
( ( fact.wrkg01_ord_prod_ord_id_c = driv.wrkg38_ord_id_c ) OR
( fact.wrkg01_cnt_vin_full_c = driv.wrkg38_vin_full_c) ) and
driv.WRKG38_ACTION_C <> 'A';
explain plan:--
SELECT STATEMENT Optimizer=CHOOSE (Cost=75 Card=1 Bytes=2520)
SORT (AGGREGATE)
NESTED LOOPS (Cost=75 Card=45 Bytes=2520)
TABLE ACCESS (FULL) OF MWRKG38_DRIVER_ODS (Cost=1 Card=2 Bytes=58)
PARTITION (CONCATENATED)
TABLE ACCESS (BY LOCAL INDEX ROWID) OF MWRKG01_GEVEXT_F (Cost=37
Card=113915 Bytes=3075705)
INDEX (RANGE SCAN) OF MWRKG011 (NON-UNIQUE) (Cost=33 Card=113915)
Thank You

Answer 1

Hi Vijaya
You can try this. But I don't know it will improve the performance or not
select fact.* from MWRKG01_GEVEXT_F fact, MWRKG38_DRIVER_ODS driv
where ( fact.WRKG01_ORD_PROD_SRC_C = driv.WRKG38_ORD_PROD_SRC_C) AND
fact.wrkg01_ord_prod_ord_id_c = driv.wrkg38_ord_id_c
driv.WRKG38_ACTION_C <> 'A'
union
select fact.* from MWRKG01_GEVEXT_F fact, MWRKG38_DRIVER_ODS driv
where fact.WRKG01_ORD_PROD_SRC_C = driv.WRKG38_ORD_PROD_SRC_C) AND
fact.wrkg01_cnt_vin_full_c = driv.wrkg38_vin_full_c and
driv.WRKG38_ACTION_C <> 'A';
Good luck
Murali
Can somebody please tell me how i can re-write the query to avoid the OR clause
so that i can use the index on WRKG38_VIN_FULL_C
we have following indexes on fact table.
1. composite index on (WRKG01_ORD_PROD_SRC_C and WRKG01_ORD_PROD_ORD_ID_C)
2. non-unique index on WRKG38_VIN_FULL_C
select fact.* from MWRKG01_GEVEXT_F fact, MWRKG38_DRIVER_ODS driv
where ( fact.WRKG01_ORD_PROD_SRC_C = driv.WRKG38_ORD_PROD_SRC_C) AND
( ( fact.wrkg01_ord_prod_ord_id_c = driv.wrkg38_ord_id_c ) OR
( fact.wrkg01_cnt_vin_full_c = driv.wrkg38_vin_full_c) ) and
driv.WRKG38_ACTION_C <> 'A';
explain plan:--
SELECT STATEMENT Optimizer=CHOOSE (Cost=75 Card=1 Bytes=2520)
SORT (AGGREGATE)
NESTED LOOPS (Cost=75 Card=45 Bytes=2520)
TABLE ACCESS (FULL) OF MWRKG38_DRIVER_ODS (Cost=1 Card=2 Bytes=58)
PARTITION (CONCATENATED)
TABLE ACCESS (BY LOCAL INDEX ROWID) OF MWRKG01_GEVEXT_F (Cost=37
Card=113915 Bytes=3075705)
INDEX (RANGE SCAN) OF MWRKG011 (NON-UNIQUE) (Cost=33 Card=113915)
Thank You