Sql statement is taking more then excepted time

Hi All,
below query is generating report ,but problem is when this query is execute it is taking more then 10 minutes.
can any one please help me how to increase the performance.
please tell me the steps plzzz...
SELECT /*+ parallel(itgmm,4) parallel(cigs,4) */DISTINCT itgmm.product_code_ato product_code,
itgmm.model_name_sales model_name,
itgmm.code_name_design code_name,
itgmm.on_sales_date on_sale_date,
itgmm.destination destination,
NVL (cigs.year, itgmm.year) year,
UPPER (NVL (cigs.season, itgmm.season)) season,
cigs.model_series model_series,
cmpt.product_type product_type,
ilgmi_odm.category_value AS odm,
cmst.sales_type sales_type,
'0' AS delete_flag,
'Admin' create_by,
SYSDATE create_date,
ilgmi_fct.category_value AS config_factory
FROM (SELECT /*+ parallel(cmpt,4) parallel(cigs,4) */ model_id,
destination,
product_code_ato,
model_name_sales,
code_name_design,
on_sales_date,
sales_type,
product_type,
CASE INSTR (BUILD_SEASON, '-')
WHEN 5
THEN
DECODE (
UPPER(SUBSTR (BUILD_SEASON,
'0',
INSTR (BUILD_SEASON, '-') - 1)),
'FALL',
UPPER(SUBSTR (BUILD_SEASON,
INSTR (BUILD_SEASON, '-') + 1)),
UPPER(SUBSTR (BUILD_SEASON,
'0',
INSTR (BUILD_SEASON, '-') - 1))
ELSE
UPPER(SUBSTR (BUILD_SEASON,
INSTR (BUILD_SEASON, '-') + 1))
END
AS YEAR,
CASE INSTR (BUILD_SEASON, '-')
WHEN 5
THEN
DECODE (
UPPER(SUBSTR (BUILD_SEASON,
'0',
INSTR (BUILD_SEASON, '-') - 1)),
'FALL',
UPPER(SUBSTR (BUILD_SEASON,
'0',
INSTR (BUILD_SEASON, '-') - 1)),
UPPER(SUBSTR (BUILD_SEASON,
INSTR (BUILD_SEASON, '-') + 1))
ELSE
UPPER(SUBSTR (BUILD_SEASON,
'0',
INSTR (BUILD_SEASON, '-') - 1))
END
AS SEASON
FROM itpcs.itpcs_tran_grt_mdl_mast a
WHERE ROWID = (SELECT MAX (ROWID)
FROM itpcs.itpcs_tran_grt_mdl_mast b
WHERE a.product_code_ato = b.product_code_ato))
itgmm,
common_intr_generation_series cigs,
common_mast_product_type cmpt,
common_mast_sales_type cmst,
(SELECT model_id, category_value
FROM itpcs.itpcs_list_grt_mdl_items
WHERE sub_category_id = 41) ilgmi_odm,
(SELECT model_id, category_value
FROM itpcs.itpcs_list_grt_mdl_items
WHERE sub_category_id = 42) ilgmi_fct
WHERE NOT EXISTS (SELECT 1
FROM itpcs.itpcs_vintr_sku b
WHERE b.product_code = itgmm.product_code_ato)
AND itgmm.model_id = ilgmi_odm.model_id
AND itgmm.model_id = ilgmi_fct.model_id
AND itgmm.model_name_sales = cigs.model_name
--AND itgmm.year = cigs.year
--AND itgmm.season = cigs.season
AND itgmm.product_type = cmpt.product_type_name
AND itgmm.sales_type = cmst.sales_type_name
UNION
SELECT /*+ parallel(ivs,4) parallel(cigs,4) */ DISTINCT ivs.product_code product_code,
ivs.product_name model_name,
ivs.generation_name code_name,
ivs.sellin_date on_sale_date,
ivs.product_specification_code destination,
NVL (cigs.year, ivs.season_year) year,
--NVL (cigs.season, cms.season) season,
NVL (cigs.season, substr(upper(ivs.season_name),6,length(ivs.season_name))) season,
cigs.model_series model_series,
TO_NUMBER (ivg.series_sgment) product_type,
ivs_odm.customer_name AS odm,
TO_NUMBER (ivs.model_type) sales_type,
ivs.delete_flag delete_flag,
'Admin' create_by,
SYSDATE create_date,
ivs_fct.customer_name AS config_factory
FROM itpcs.itpcs_vintr_sku ivs,
common_intr_generation_series cigs,
itpcs.itpcs_vintr_generation ivg,
--common_mast_season cms,
(SELECT customer_code, customer_name
FROM itpcs.itpcs_vintr_supplier
WHERE factory_type IN (1, 2)) ivs_odm,
(SELECT customer_code, customer_name
FROM itpcs.itpcs_vintr_supplier
WHERE factory_type IN (1, 2)) ivs_fct
WHERE ivs.generation_name = ivg.generation_name
AND ivs.product_name = cigs.model_name
AND ivs.bu_factory_code = ivs_odm.customer_code
AND ivs.config_factory_code = ivs_fct.customer_code
--AND ivs.SEASON_CODE = cms.SEASON_CODE
--AND ivs.season_year = cigs.year
--AND UPPER (cms.season) = cigs.season
AND ivs.product_code IS NOT NULL
AND ivs.sku_type = 2
AND ivs.delete_flag = 0
--AND ivs.discontinued_flag = 0
AND ivs.ROWID = (SELECT MAX (ROWID)
FROM itpcs.itpcs_vintr_sku a
WHERE a.product_code = ivs.product_code) ;
Thanks,
Krupa

Please provide the information detailed in
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