How to optimize left join subqueries in oracle - optimization

Question

I would like to optimize a query with so many left join sub queries.See my query;
SELECT DISTINCT pi.proforma_no,
m.vv_cd,
m.pid,
bl.bill_lading_nbr,
bld.cntr_nbr,
NVL(ts.quantity, bld.quantity) AS quantity,
vsc.vsl_nm,
vsc.in_voy_nbr,
m.rec_status,
bld.idx_no,
bld.colli_type,
bld.volume,
bld.gross_weight_kgs,
bld.has_heavy_lift,
NVL(NVL(pi.fa,pi.consignee),NVL(bld.cust_tariff_client,NVL(bl.fa,bl.consignee))) AS client,
col.is_pos,
col.cargo_type,
bld.direct_delivery,
cn.cntr_seq_nbr,
bld.package_type_cd,
bld.cargo_dtl_desc,
NVL(ts.quantity, bld.quantity) AS quantity,
bld.weight,
bld.t1,
bl.pload AS port_code,
bld.purpose,
bld.volume,
bld.GROSS_WEIGHT_KGS,
pi.WAIVE_DOC_FEE,
pi.WAIVE_DOC_FEE_REMARKS,
m.pid
|| '='
|| trim(bl.bill_lading_nbr)
|| '='
|| bld.idx_no
|| '='
|| trim(bld.cntr_nbr) AS unique_key,
DECODE(NVL(bld.CUST_TARIFF_CLIENT,''),'', DECODE('N','N',DECODE(tariff.is_metric_ton,'Y',tariff.local_rate *bld.weight,tariff.local_rate*bld.quantity), NVL(DECODE(ext_tariff_toStd.is_metric_ton,'Y',ext_tariff_toStd.local_rate*bld.weight,ext_tariff_toStd.local_rate*bld.quantity),0)), DECODE('N','N',DECODE(custTar.is_metric_ton,'Y',custTar.local_rate*bld.weight,custTar.local_rate*bld.quantity),0)) AS local_rate,
DECODE(NVL(bld.CUST_TARIFF_CLIENT,''),'', DECODE('N','N',DECODE(tariff.is_metric_ton,'Y',tariff.global_rate *bld.weight,tariff.global_rate*bld.quantity), NVL(DECODE(ext_tariff_toStd.is_metric_ton,'Y',ext_tariff_toStd.global_rate*bld.weight,ext_tariff_toStd.global_rate*bld.quantity),0)), DECODE('N','N',DECODE(custTar.is_metric_ton,'Y',custTar.global_rate*bld.weight,custTar.global_rate*bld.quantity),0)) AS global_rate,
DECODE(NVL(bld.CUST_TARIFF_CLIENT,''),'', DECODE('N','N',tariff.version_nbr,DECODE(col.tariff_ext_cost_id,NULL,0,NVL(ext_tariff_toStd.version_nbr,NVL(ext_tariff.version_nbr,tariff.version_nbr)))), -1) AS version_nbr,
DECODE(NVL(bld.CUST_TARIFF_CLIENT,''),'', DECODE('N','N',tariff.id,DECODE(col.tariff_ext_cost_id,NULL,0,NVL(ext_tariff_toStd.id,NVL(ext_tariff.id,tariff.id)))), -1) AS tariff_id,
DECODE(NVL(bld.CUST_TARIFF_CLIENT,''),'', DECODE('N','N',0,(NVL(DECODE(ext_tariff.is_metric_ton,'Y',ext_tariff.local_rate *bld.weight,ext_tariff.local_rate*bld.quantity),0))), 0) AS local_ext_amount,
DECODE(NVL(bld.CUST_TARIFF_CLIENT,''),'', DECODE('N','N',0,(NVL(DECODE(ext_tariff.is_metric_ton,'Y',ext_tariff.global_rate *bld.weight,ext_tariff.global_rate*bld.quantity),0))), 0) AS global_ext_amount,
(NVL(ts.quantity, bld.quantity) *NVL(disch.local_amount,0)) + DECODE(col.is_pos,'Y',DECODE(NVL(pos.local_amount,0),0,0,(bld.weight*pos.local_amount)),0) + DECODE(col.is_pos_add_rate,'Y',DECODE(bld.weight,0,0,NVL(addPos.local_amount,0)),0) AS local_other_amount,
(NVL(ts.quantity, bld.quantity) *NVL(disch.global_amount,0)) + DECODE(col.is_pos,'Y',DECODE(NVL(pos.global_amount,0),0,0,(bld.weight*pos.global_amount)),0) + DECODE(col.is_pos_add_rate,'Y',DECODE(bld.weight,0,0,NVL(addPos.global_amount,0)),0) AS global_other_amount,
NVL(doc.local_amount,0) + (DECODE(SIGN(ROUND(ROUND(to_number(spTax.param_value)/100,2)*NVL(doc.local_amount,0),2)-ROUND(ROUND(to_number(spTax.param_value)/100,2)*NVL(doc.local_amount,0),0)-0.05),-1, ROUND(ROUND(to_number(spTax.param_value)/100,2)*NVL(doc.local_amount,0),0)+0.05, ROUND(ROUND(to_number(spTax.param_value)/100,2)*NVL(doc.local_amount,0),0))) AS local_doc_amount,
NVL(doc.global_amount,0) + (DECODE(SIGN(ROUND(ROUND(to_number(spTax.param_value)/100,2)*NVL(doc.global_amount,0),2)-ROUND(ROUND(to_number(spTax.param_value)/100,2)*NVL(doc.global_amount,0),0)-0.05),-1, ROUND(ROUND(to_number(spTax.param_value)/100,2)*NVL(doc.global_amount,0),0)+0.05, ROUND(ROUND(to_number(spTax.param_value)/100,2)*NVL(doc.global_amount,0),0))) AS global_doc_amount,
(NVL(ts.quantity, bld.quantity) *NVL(disch.local_amount,0)) AS local_disch_amount,
DECODE(col.is_pos,'Y',DECODE(NVL(pos.local_amount,0),0,0,(bld.weight *pos.local_amount)),0) + DECODE(col.is_pos_add_rate,'Y',DECODE(bld.weight,0,0,NVL(addPos.local_amount,0)),0) AS local_pos_amount,
(NVL(ts.quantity, bld.quantity) *NVL(disch.global_amount,0)) AS global_disch_amount,
DECODE(col.is_pos,'Y',DECODE(NVL(pos.global_amount,0),0,0,(bld.weight *pos.global_amount)),0) + DECODE(col.is_pos_add_rate,'Y',DECODE(bld.weight,0,0,NVL(addPos.global_amount,0)),0) AS global_pos_amount,
NVL(doc.local_amount,0) AS local_pure_doc_amount,
NVL(doc.global_amount,0) AS global_pure_doc_amount,
DECODE(NVL(bld.CUST_TARIFF_CLIENT,''),'', DECODE('N','N',tariff.local_rate, NVL(ext_tariff_toStd.local_rate,0)), DECODE('N','N',custTar.local_rate,0)) AS tariff_local_rate,
DECODE(NVL(bld.CUST_TARIFF_CLIENT,''),'', DECODE('N','N',tariff.global_rate, NVL(ext_tariff_toStd.global_rate,0)), DECODE('N','N',custTar.global_rate,0)) AS tariff_global_rate,
DECODE(pi.proforma_no, NULL, 'N', DECODE(bld.is_paid,'N',DECODE(pi.proforma_no,NULL,'N',DECODE(pi.is_special,'Y','SP','UP')),bld.is_paid)) AS bld_status,
tariff.remark,
col.is_std_cargo,
DECODE(NVL(bld.CUST_TARIFF_CLIENT,''),'',DECODE('N','N',tariff.serv_id
||NVL(ext_tariff_toStd.serv_id,''),ext_tariff.serv_id),custTar.serv_id) AS serv_id
FROM manifest m
INNER JOIN vessel_call vsc
ON vsc.vv_cd = m.vv_cd
LEFT JOIN vessel_event ve
ON ve.vv_cd = vsc.vv_cd
INNER JOIN bl
ON bl.pid = m.pid
AND bl.transfer_status = 'N'
INNER JOIN bl_dtl bld
ON bld.pid = m.pid
AND bld.is_paid = 'N'
AND bld.bill_lading_nbr = bl.bill_lading_nbr
LEFT JOIN tally_sheet ts
ON ts.manifest_pid = m.pid
AND trim(upper(ts.bill_lading_nbr)) = trim(upper(bl.bill_lading_nbr))
AND ts.cargo_idx_no = bld.idx_no
AND trim(upper(ts.cntr_nbr)) = trim(upper(bld.cntr_nbr))
INNER JOIN colli col
ON trim(col.colli_code) = trim(bld.colli_type)
LEFT JOIN
(SELECT pi.*,
pid.bill_lading_nbr,
pid.cntr_no
FROM proforma_invoice_dtl pid,
proforma_invoice pi
WHERE pid.proforma_no = pi.proforma_no
AND pi.reversal_proforma IS NULL
AND pid.quantity >= 0
AND pid.total_global_amount >=0
AND pid.reversal_proforma IS NULL
) pi
ON pi.bill_lading_nbr = bld.bill_lading_nbr
AND pi.cntr_no = bld.cntr_nbr
AND pi.vv_cd = m.vv_cd
LEFT JOIN system_parameter spTax
ON spTax.param_cd = 'SAF_VAT'
LEFT JOIN
(SELECT NVL(serv.local_amount,0) AS local_rate,
NVL(serv.global_amount,0) AS global_rate,
tar.id,
tar.is_metric_ton,
tar.version_nbr,
tver.eff_start_dttm,
tar.remark,
serv.id AS serv_id
FROM tariffs tar
INNER JOIN tariff_details tardet
ON tardet.tariff_id = tar.id
INNER JOIN services serv
ON serv.id = tardet.service_id
INNER JOIN tariff_version tver
ON tver.version_nbr = tar.version_nbr
AND serv.service_type NOT IN ('C','R','L','D','DG')
AND serv.rec_status = 'A'
WHERE tar.rec_status = 'A'
ORDER BY tver.eff_start_dttm DESC
) tariff ON tariff.id = tariff_end_date(NVL(ve.atb,vsc.vsl_eta_dttm),DECODE(bld.purpose,'TS1W',col.TARIFF_1WAYTRANS_ID,'TS2W',col.TARIFF_2WAYTRANS_ID,col.tariff_dischg_id))
LEFT JOIN
(SELECT NVL(serv.local_amount,0) AS local_rate,
NVL(serv.global_amount,0) AS global_rate,
tar.id,
tar.is_metric_ton,
tar.version_nbr,
tver.eff_start_dttm,
serv.id AS serv_id
FROM tariffs tar
INNER JOIN tariff_details tardet
ON tardet.tariff_id = tar.id
INNER JOIN tariff_version tver
ON tver.version_nbr = tar.version_nbr
INNER JOIN services serv
ON serv.id = tardet.service_id
AND serv.service_type NOT IN ('C','R','L','D','DG')
AND serv.rec_status = 'A'
WHERE tar.rec_status = 'A'
ORDER BY tver.eff_start_dttm DESC
) ext_tariff_toStd ON ext_tariff_toStd.id = col.tariff_ext_cost_id
LEFT JOIN
(SELECT NVL(serv.local_amount,0) AS local_rate,
NVL(serv.global_amount,0) AS global_rate,
tar.id,
tar.is_metric_ton,
tar.version_nbr,
tver.eff_start_dttm,
serv.id AS serv_id,
tardet.usage
FROM tariffs tar
INNER JOIN tariff_details tardet
ON tardet.tariff_id = tar.id
INNER JOIN tariff_version tver
ON tver.version_nbr = tar.version_nbr
INNER JOIN services serv
ON serv.id = tardet.service_id
AND serv.service_type IN ('C','R','L','DG')
AND serv.rec_status = 'A'
WHERE tar.rec_status = 'A'
ORDER BY tver.eff_start_dttm DESC
) ext_tariff ON ((ext_tariff.id = col.tariff_ext_cost_id
AND NVL(ext_tariff.usage,'%') LIKE '%'
||bld.purpose
||'%')
OR ext_tariff.id = tariff_end_date(NVL(ve.atb,vsc.vsl_eta_dttm),DECODE(bld.purpose,'TS1W',col.TARIFF_1WAYTRANS_ID,'TS2W',col.TARIFF_2WAYTRANS_ID,col.tariff_dischg_id)))
LEFT JOIN
(SELECT custTar.EFFECTIVE_DTTM,
bld.bill_lading_nbr,
bld.cntr_nbr,
DECODE(NVL(DECODE(bld.purpose,'TS2W',custTar.tariff_2waytrans_amt,'TS1W',custTar.tariff_1waytrans_amt,custTar.tariff_disch_amt),0),0,local_rate,DECODE(bld.purpose,'TS2W',custTar.tariff_2waytrans_amt,'TS1W',custTar.tariff_1waytrans_amt,custTar.tariff_disch_amt)) AS local_rate,
DECODE(NVL(DECODE(bld.purpose,'TS2W',custTar.tariff_2waytrans_amt,'TS1W',custTar.tariff_1waytrans_amt,custTar.tariff_disch_amt),0),0,global_rate,DECODE(bld.purpose,'TS2W',custTar.tariff_2waytrans_amt,'TS1W',custTar.tariff_1waytrans_amt,custTar.tariff_disch_amt)) AS global_rate,
custTar.id,
DECODE(bld.purpose,'TS2W',NVL(custTar.tariff_2waytrans_mton,is_metric_ton), 'TS1W',NVL(custTar.tariff_1waytrans_mton,is_metric_ton), NVL(custTar.tariff_disch_mton,is_metric_ton)) AS is_metric_ton,
version_nbr,
cust_tariff_val.serv_id
FROM customized_tariff custTar
INNER JOIN vessel_call vsc
ON upper(vsc.vsl_nm) LIKE '%'
|| trim(upper(NVL('EURPCARGO VENEZIA','')))
|| '%'
AND vsc.in_voy_nbr = trim(upper(NVL('14120502','')))
OR vsc.vv_cd = trim(NVL('2014000433',''))
INNER JOIN manifest m
ON m.vv_cd = NVL(vsc.vv_cd,'')
INNER JOIN bl_dtl bld
ON bld.cust_tariff_client = custTar.client_code
AND bld.pid = m.pid
INNER JOIN customized_tariff_dtl custTarDtl
ON custTarDtl.cust_tar_id = custTar.id
AND trim(custTarDtl.colli_code) = bld.colli_type
LEFT JOIN
(SELECT NVL(serv.local_amount,0) AS local_rate,
NVL(serv.global_amount,0) AS global_rate,
tar.id,
tar.is_metric_ton,
tar.version_nbr,
tver.eff_start_dttm,
serv.id AS serv_id
FROM tariffs tar
INNER JOIN tariff_details tardet
ON tardet.tariff_id = tar.id
INNER JOIN tariff_version tver
ON tver.version_nbr = tar.version_nbr
INNER JOIN services serv
ON serv.id = tardet.service_id
AND serv.rec_status = 'A'
WHERE tar.rec_status = 'A'
ORDER BY tver.eff_start_dttm DESC
) cust_tariff_val ON cust_tariff_val.id = DECODE(bld.purpose,'TS2W',custTar.TARIFF_2WAYTRANS_ID,'TS1W',custTar.TARIFF_1WAYTRANS_ID,custTar.TARIFF_DISCH_ID)
WHERE trim(custTar.client_code) = bld.cust_tariff_client
AND custTar.rec_status = 'A'
ORDER BY custTar.effective_dttm DESC,
custTar.LAST_MODIFY_DTTM DESC
) custTar ON TO_CHAR(custTar.EFFECTIVE_DTTM,'yyyymmdd') <= TO_CHAR(NVL(ve.atb,vsc.vsl_eta_dttm),'yyyymmdd')
AND custTar.bill_lading_nbr = bld.bill_lading_nbr
AND custTar.cntr_nbr = bld.cntr_nbr
LEFT JOIN
(SELECT NVL(serv.local_amount,0) AS local_amount,
NVL(serv.global_amount,0) AS global_amount,
tar.id,
tar.is_metric_ton,
tar.version_nbr,
tver.eff_start_dttm
FROM tariffs tar
INNER JOIN tariff_details tardet
ON tardet.tariff_id = tar.id
INNER JOIN tariff_version tver
ON tver.version_nbr = tar.version_nbr
INNER JOIN services serv
ON serv.id = tardet.service_id
AND serv.service_type IN ('D')
AND serv.rec_status = 'A'
WHERE tar.rec_status = 'A'
ORDER BY tver.eff_start_dttm DESC
) disch ON disch.id = col.tariff_ext_cost_id
LEFT JOIN
(SELECT rownum AS seq,
local_amount,
global_amount,
last_modify_dttm
FROM services
WHERE service_type = 'U'
AND rec_status = 'A'
ORDER BY last_modify_dttm DESC
) doc
ON doc.seq = 1
LEFT JOIN
(SELECT rownum AS seq,
local_amount,
global_amount,
last_modify_dttm
FROM services
WHERE service_type = 'L'
AND rec_status = 'A'
ORDER BY last_modify_dttm DESC
) heavyLift
ON heavyLift.seq = 1
LEFT JOIN
(SELECT rownum AS seq,
local_amount,
global_amount,
last_modify_dttm
FROM services
WHERE service_type = 'P'
AND rec_status = 'A'
ORDER BY last_modify_dttm DESC
) pos
ON pos.seq = 1
LEFT JOIN
(SELECT rownum AS seq,
local_amount,
global_amount,
last_modify_dttm
FROM services
WHERE service_type = 'O'
AND rec_status = 'A'
ORDER BY last_modify_dttm DESC
) addPos
ON addPos.seq = 1
LEFT JOIN cntr cn
ON cn.cntr_nbr = bld.cntr_nbr
AND cn.txn_status = 'A'
WHERE m.pid
|| '='
|| trim(bl.bill_lading_nbr)
|| '='
|| bld.idx_no
|| '='
|| trim(bld.cntr_nbr) LIKE NVL(null,'%')
AND (m.vv_cd = trim(NVL('2014000433',''))
OR ( upper(vsc.vsl_nm) LIKE '%'
|| trim(upper(NVL('EURPCARGO VENEZIA','')))
|| '%'
AND vsc.in_voy_nbr = trim(upper(NVL('14120502',''))) ))
ORDER BY bl.bill_lading_nbr;
Any suggestion for optimizing left join sub queries for oracle.