How to reduce Costing

I have following query but the query takes too high costing, how should i reduce the cost.
TRANCHE_BALANCE table having partition.
query is
SELECT /* + NO_USE_HASH(tbb) index(tbb XIE3TRANCHE_BALANCE) index (tbb XIE4TRANCHE_BALANCE) */
tbb.project_id, tbb.tranche_nbr,
tbb.summary_date,
tbb.product_sub_type_code,
tbb.product_type_code,
CAST (tbb.crmcmt_usd_amt AS NUMBER) crmcmt_usd_amt,
CAST (tbb.crmdout_usd_amt AS NUMBER) crmdout_usd_amt,
CAST (tbb.crmmtm_usd_amt AS NUMBER) crmmtm_usd_amt,
CAST (tbb.crmoleq_usd_amt AS NUMBER) crmoleq_usd_amt,
CAST (tbb.crmunds_usd_amt AS NUMBER) crmunds_usd_amt,
CAST (tbb.crmamtm_usd_amt AS NUMBER) crmamtm_usd_amt
FROM mis.tranche_balance tbb,
mis.product_categorization pc
Where tbb.product_type_code = pc.product_type_code
AND tbb.product_sub_type_code = pc.product_sub_type_code;
PLAN SHOWS
SELECT STATEMENT CHOOSE
Cost :18,846 Bytes 97,768,6-368 Cardinality: 2,036,841
# HASH JOIN
Cost:18,846 Bytes :252 Cardinality : 2,036,841
INDEX FULL SCAN UNIQUE MIS.XPKPRODUCT_CATGORIZATION
Cost : 2 Bytes:252 Cardinality :36
PARTITION RANGE ALL
Partition #:3 Partition acessed #1 - #122
TABLE ACCESS FULL MIS.TRANCHE_BALANCE
Cost :18,789 Bytes : 83,510,481 Cardinality:2,036,841
Partition #:3 Partition acessed #1 - #122
Thanks for advance

debasishghosh wrote:
I have following query but the query takes too high costing, how should i reduce the cost.
TRANCHE_BALANCE table having partition.Firstly, regardless of the "cost", is the query performant? If not, take a read of the following thread...
When your query takes too long ...
Secondly, it would be helpful, when you post code or data, if you put {noformat}{noformat} tags before and after it so that the formatting is retained on the forum. I'll do that here for you for now...SELECT /* + NO_USE_HASH(tbb) index(tbb XIE3TRANCHE_BALANCE) index (tbb XIE4TRANCHE_BALANCE) */
tbb.project_id, tbb.tranche_nbr,
tbb.summary_date,
tbb.product_sub_type_code,
tbb.product_type_code,
CAST (tbb.crmcmt_usd_amt AS NUMBER) crmcmt_usd_amt,
CAST (tbb.crmdout_usd_amt AS NUMBER) crmdout_usd_amt,
CAST (tbb.crmmtm_usd_amt AS NUMBER) crmmtm_usd_amt,
CAST (tbb.crmoleq_usd_amt AS NUMBER) crmoleq_usd_amt,
CAST (tbb.crmunds_usd_amt AS NUMBER) crmunds_usd_amt,
CAST (tbb.crmamtm_usd_amt AS NUMBER) crmamtm_usd_amt
FROM mis.tranche_balance tbb,
mis.product_categorization pc
Where tbb.product_type_code = pc.product_type_code
AND tbb.product_sub_type_code = pc.product_sub_type_code;
SELECT STATEMENT CHOOSE
Cost :18,846 Bytes 97,768,6-368 Cardinality: 2,036,841
# HASH JOIN
Cost:18,846 Bytes :252 Cardinality : 2,036,841
INDEX FULL SCAN UNIQUE MIS.XPKPRODUCT_CATGORIZATION
Cost : 2 Bytes:252 Cardinality :36
PARTITION RANGE ALL
Partition #:3 Partition acessed #1 - #122
TABLE ACCESS FULL MIS.TRANCHE_BALANCE
Cost :18,789 Bytes : 83,510,481 Cardinality:2,036,841
Partition #:3 Partition acessed #1 - #122
Without knowing your tables and what indexes you have defined on them and without knowing the number of rows of data as well as the cardinality and selectivity of the data, we're not going to be able to give any real advice.
What happens if you leave out the Hints? (Index and Optimiser Hints shouldn't be used in production code, they should only be used for debugging - with the exception of the APPEND hints for inserts)

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