Need help further tuning view source for outer join

Question

I have been working on tuning views for use in Discoverer for some time, and I have greatly improved upon what was there, but it is still not where I need it to be. There are 2 views the users join together in Discoverer - one for contract lines, and one for contract flexfields. Run as a 1 to 1 join on contract number, performance is great. However, as soon as I have an outer join on flexfields, the performance is awful. We are talking a difference of under a minute to hours and hours. I have to be able to perform an outer join because there can be contracts without flexfields. Can anyone suggest an alternative method to get the data or further tuning? I will paste both the contract lines and contract flexfields source - I have tuned the flexfields but have done nothing to date with the lines.
CREATE OR REPLACE VIEW XXDBD_CONTRACT_FLEXFIELDS AS
SELECT core.contract_id, core.service_id, core.contract_number, core.service_line, core.service, core.product_line, core.equipment, core.UL_Certificate_And_End_Date, core.MAF, core.Termination_Penalty_Percentage, core.multi_year, core.multi_year_effective_dates, core.terms_multi_year, core.SerLineRenPricingMethod, core.ren_line_change, core.zone, core.add_invoice_display, core.add_subgrouping, re.diebold_price, attr.coverage_hours, attr.reaction_times, attr.resolution_times, attr.repair_times, tr.performance_requirement, attr.penalty, attr.penalty_amount, attr.penalty_bonus, attr.mon_break_start, attr.mon_break_end, attr.tues_break_start, attr.tues_break_end, attr.wed_break_start, attr.wed_break_end, attr.thu_break_start, attr.thu_break_end, attr.fri_break_start, attr.fri_break_end, attr.sat_break_start, attr.sat_break_end, attr.sun_break_start, attr.sun_break_end, attr.split_covering, attr.cash_handling
FROM (SELECT aa.ID Contract_id,
aa.contract_number,
dd.id Service_ID ,
dd.cle_id dd_cle_id,
dd.line_number service_line,
xxdbd_Disco_Service_Contract.GetServNameInv
(dd.id) Service,
dd.line_number ||'.'||ee.line_number Product_Line,
xxdbd_Disco_Service_Contract.GetEqpNoInvoice(ee.id)
Equipment,
DECODE(dd.attribute_category,'Service Contracts',
NVL(xxdbd_Disco_Service_Contract.GetContractMasterProperty('DBD_OKS_50_CHARS', dd.attribute1),dd.attribute1),'') UL_Certificate_And_End_Date,
dd.attribute2 MAF,
DECODE(dd.attribute_category,'Service Contracts',NVL(xxdbd_Disco_Service_Contract.GetContractMasterProperty('DBD_OKS_NUMERIC', dd.attribute3),dd.attribute3),'') Termination_Penalty_Percentage,
DECODE(dd.attribute_category,'Service Contracts', DECODE(NVL(xxdbd_Disco_Service_Contract.GetContractMasterProperty('DBD_OKS_MULTIYEAR', dd.attribute5),dd.attribute5),
'N','No Multi-Year',
'Y','Multi-Year, Years not Known',
'Y1','Multi-Year for 1 Year',
'Y2','Multi-Year for 2 Year',
'Y3','Multi-Year for 3 Year',
'Y4','Multi-Year for 4 Year',
'Y5','Multi-Year for 4 Year',dd.attribute5),'')Multi_Year,
dd.attribute4 Multi_Year_Effective_Dates,
DECODE(dd.attribute_category,'Service Contracts', NVL(xxdbd_Disco_Service_Contract.GetContractMasterProperty('DBD_OKS_450_CHARS', dd.attribute9),dd.attribute9),'') Terms_Multi_Year,
DECODE(dd.attribute_category,'Service Contracts', DECODE(NVL(xxdbd_Disco_Service_Contract.GetContractMasterProperty('DBD_OKS_RENEWAL_PRICING', dd.attribute6),dd.attribute6),
'MP', 'DBD Markup Percent',
'CP', 'DBD Contract Price',
'AI', 'DBD Amount Increase',
'AD', 'DBD Amount Decrease',
'TA', 'DBD Target Amount',
'FR', 'DBD Flat Rate',dd.attribute6),'') SerLineRenPricingMethod,
DECODE(dd.attribute_category,'Service Contracts', NVL(xxdbd_Disco_Service_Contract.GetContractMasterProperty('DBD_OKS_NUMERIC', dd.attribute7),dd.attribute7),'') Ren_Line_Change,
DECODE(dd.attribute_category,'Service Contracts', DECODE(NVL(xxdbd_Disco_Service_Contract.GetContractMasterProperty('DBD_OKS_ZONE', dd.attribute8),dd.attribute8),
'DNA1','DNA Zone 1',
'DNA2','DNA Zone 2',
'DNA3','DNA Zone 3',
'BRAZIL1','Brazil Zone 1 (50 KM)',
'BRAZIL2','Brazil Zone 2 (80 KM)',
'BRAZIL3','Brazil Zone 3 (200 KM)',dd.attribute8),'')Zone,
DECODE(dd.attribute11, 'N','None','SC','Sub Component', 'SN', 'Serial Number', 'SNSC', 'Serial Number and Sub-Component') Add_Invoice_Display,
DECODE(dd.attribute10, 'SI','Service Item', 'CP','Covered Product', 'PC','Product Category') Add_SubGrouping,
dd.attribute12 Diebold_Price,
ee.id ee_id,
ee.cle_id ee_cle_id
FROM okc_k_headers_b aa,
okc_k_lines_b dd,
okc_k_lines_b ee
-- xxdbd_temp_flex_contract tfc
WHERE aa.id = dd.DNZ_CHR_ID
AND dd.CLE_ID IS NULL
AND dd.id = ee.cle_id
AND ee.DNZ_CHR_ID = aa.id
AND ee.LSE_ID =9
AND dd.LSE_ID =1
-- and aa.contract_number = 'NL0000014'
-- and aa.contract_number in (select contract_number from xxdbd_flex_contract)
-- AND tfc.contract_number = aa.contract_number
) core,
(SELECT h.contract_number,
DECODE(l.attribute_category,
'Coverage Break', xxdbd_get_sib_cont_id(xxdbd_get_parent_cle_id(l.cle_id,2)),
'Business Process',xxdbd_get_sib_cont_id(xxdbd_get_parent_cle_id(l.cle_id,1)),
'Coverage Template Header',xxdbd_get_sib_cont_id(l.cle_id),
'Transaction Type', xxdbd_get_sib_cont_id(xxdbd_get_parent_cle_id(l.cle_id,2)),null) ee_id,
DECODE(l.attribute_category, 'Business Process', l.attribute1) Coverage_Hours,
DECODE(l.attribute_category, 'Business Process', l.attribute2) Reaction_Times,
DECODE(l.attribute_category, 'Business Process', l.attribute3) Resolution_Times,
DECODE(l.attribute_category, 'Business Process', l.attribute4) Repair_Times,
DECODE(l.attribute_category, 'Business Process', DECODE(l.attribute5,
'RA', 'REACTION'
, 'RS', 'RESOLUTION'
, 'RR', 'REACTION & RESOLUTION'
, 'NR', 'NO REQUIREMENT',
l.attribute5)) Performance_Requirement,
DECODE(l.attribute_category, 'Coverage Template Header', l.attribute1) Penalty,
DECODE(l.attribute_category, 'Coverage Template Header', l.attribute2) Penalty_Amount,
DECODE(l.attribute_category, 'Coverage Template Header', l.attribute3) Penalty_Bonus,
DECODE(l.attribute_category, 'Coverage Break', l.attribute1) Mon_Break_Start,
DECODE(l.attribute_category, 'Coverage Break', l.attribute2) Mon_Break_End,
DECODE(l.attribute_category, 'Coverage Break', l.attribute3) Tues_Break_Start,
DECODE(l.attribute_category, 'Coverage Break', l.attribute4) Tues_Break_End,
DECODE(l.attribute_category, 'Coverage Break', l.attribute5) Wed_Break_Start,
DECODE(l.attribute_category, 'Coverage Break', l.attribute6) Wed_Break_End,
DECODE(l.attribute_category, 'Coverage Break', l.attribute7) Thu_Break_Start,
DECODE(l.attribute_category, 'Coverage Break', l.attribute8) Thu_Break_End,
DECODE(l.attribute_category, 'Coverage Break', l.attribute9) Fri_Break_Start,
DECODE(l.attribute_category, 'Coverage Break', l.attribute10) Fri_Break_End,
DECODE(l.attribute_category, 'Coverage Break', l.attribute11) Sat_Break_Start,
DECODE(l.attribute_category, 'Coverage Break', l.attribute12) Sat_Break_End,
DECODE(l.attribute_category, 'Coverage Break', l.attribute13) Sun_Break_Start,
DECODE(l.attribute_category, 'Coverage Break', l.attribute14) Sun_Break_End,
DECODE(l.attribute_category, 'Transaction Type', l.attribute1) Split_Covering,
DECODE(l.attribute_category, 'Transaction Type', l.attribute2) Cash_Handling
from okc_k_lines_b l , okc_k_headers_b h--, xxdbd_temp_flex_contract tfc
where l.attribute_category in ('Coverage Break', 'Business Process', 'Coverage Template Header','Transaction Type')
and h.id = l.dnz_chr_id
-- and h.contract_number in (select contract_number from xxdbd_flex_contract)
-- and tfc.contract_number = h.contract_number
) attr
where core.ee_id = attr.ee_id (+)
and core.contract_number = attr.contract_number (+);
create or replace view xxdbd_contract_lines as
select aa.id Contract_id,
bb.id Service_id,
aa.CONTRACT_NUMBER,
F1.USER_NAME Created_By,
F2.USER_NAME LastUpdated_By,
bb.LINE_NUMBER Service_Line_No,
bb.LINE_NUMBER ||'.'|| cc.LINE_NUMBER Product_Line_No,
xxdbd_Disco_Service_Contract.GetServNameInv(bb.id) Service,
xxdbd_Disco_Service_Contract.GetServDescInv(bb.id) Service_Desc,
xxdbd_Disco_Service_Contract.GetServicePrice(bb.id) Service_Price,
bb.PRICE_UNIT Service_List_Price,
bb.CURRENCY_CODE,
aa.SCS_CODE Contract_Type,
bb.STS_CODE Service_Status,
bb.TRN_CODE Term_Code,
bb.START_DATE Service_start,
bb.END_DATE Service_end,
TO_NUMBER(OKS_ENT_UTIL_PVT.get_billtoshipto(Null, bb.id, 'OKX_BILLTO' )) SERVICE_BillToSite,
xxdbd_Disco_Service_Contract.GetLocAccount(TO_NUMBER(OKS_ENT_UTIL_PVT.get_billtoshipto(Null, bb.id, 'OKX_BILLTO' ))) Bill_Account,
xxdbd_Disco_Service_Contract.GetLocation(TO_NUMBER(OKS_ENT_UTIL_PVT.get_billtoshipto(NULL, bb.id, 'OKX_BILLTO' ))) Service_BillTo,
TO_NUMBER(OKS_ENT_UTIL_PVT.get_billtoshipto(NULL, bb.id, 'OKX_SHIPTO' )) SERVICE_ShipToSite ,
xxdbd_Disco_Service_Contract.GetLocation(TO_NUMBER(OKS_ENT_UTIL_PVT.get_billtoshipto(NULL, bb.id, 'OKX_SHIPTO' ))) Service_Ship_To,
xxdbd_Disco_Service_Contract.GetLocAccount(TO_NUMBER(OKS_ENT_UTIL_PVT.get_billtoshipto(NULL, bb.id, 'OKX_SHIPTO' ))) Ship_Account,
bb.DATE_RENEWED,
bb.DATE_TERMINATED,
cc.START_DATE Eqp_Start,
cc.END_DATE Eqp_End,
xxdbd_Disco_Service_Contract.GetEqpNoInvoice(cc.id) Eqp_No,
xxdbd_Disco_Service_Contract.GetEqpDescInvoice(cc.ID) Eqp_Desc,
xxdbd_Disco_Service_Contract.GetEqpQuantityInvoice(cc.id) Eqp_Quan,
xxdbd_Disco_Service_Contract.GetEqpSerialNoInvoice(cc.id) Eqp_Serial,
xxdbd_Disco_Service_Contract.GetCustomerCt(aa.id, bb.id) Cust_Contact,
DD.ORGANIZATION_ID,
dd.INSTALL_ADDRESS,
dd.INSTALL_DATE,
dd.INSTALL_SITE_ID INSTALL_SITE_USE_ID,
dd.PARTY_SITE_NAME INSTALL_SITE_NAME,
dd.PARTY_SITE_NUMBER INSTALL_SITE_NUMBER
,cii.inventory_item_id
,cii.inv_master_organization_id
,aa.authoring_org_id
,cc.id equipment_id
,TO_NUMBER(replace(bb.attribute12,',','')) annual_contract_amt
,ou.name operating_unit
,ou.organization_id operating_unit_id
,substr(xxdbd_ra_utility.Get_BusinessProcess(cc.cle_id),1,100) business_process
,cii.instance_id
,cii.instance_number
from okc_k_headers_b aa
,okc_k_lines_b bb
,okc_k_lines_b cc
,fnd_user f1
,fnd_user f2
,csi_item_instances cii
,okc_k_items items
,hr_all_organization_units ou
,xxdbd_oks_install_info_v dd
where aa.id = bb.dnz_chr_id
and bb.cle_id is null
and cc.cle_id = bb.id
and cc.dnz_chr_id = aa.id
and f1.user_id = bb.created_by
and f2.user_id = bb.last_updated_by
and cc.lse_id in (9,25,18,40)
and dd.line_id (+) = cc.id
and items.cle_id = cc.id
and cii.instance_id = items.object1_id1
and aa.authoring_org_id = ou.organization_id (+);
Here are the explain plans from TOAD:
Operation Object Name Rows Bytes Cost Object Node In/Out PStart PStop
SELECT STATEMENT Optimizer Mode=CHOOSE 6 49124
NESTED LOOPS OUTER 6 80 K 49124
VIEW 6 80 K 49112
HASH JOIN 6 1 K 49112
HASH JOIN 17 K 2 M 20214
TABLE ACCESS FULL OKC.OKC_K_HEADERS_B 5 K 175 K 37
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 17 K 1 M 20162
INDEX SKIP SCAN XXDBD.XXDBD_OKC_K_LINES_B_N10 39 17085
TABLE ACCESS FULL OKC.OKC_K_LINES_B 502 K 34 M 27803
VIEW PUSHED PREDICATE 1 107 2
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 42 3 K 216
NESTED LOOPS 50 5 K 219
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_HEADERS_B 1 33 3
INDEX RANGE SCAN OKC.OKC_K_HEADERS_B_U2 1 2
INDEX RANGE SCAN OKC.OKC_K_LINES_B_N2 1 K 32
Operation Object Name Rows Bytes Cost Object Node In/Out PStart PStop
SELECT STATEMENT Optimizer Mode=CHOOSE 245 63309
NESTED LOOPS 245 291 K 63309
NESTED LOOPS OUTER 245 286 K 63064
NESTED LOOPS 245 80 K 62574
HASH JOIN 245 74 K 61839
HASH JOIN 245 71 K 61756
HASH JOIN OUTER 245 68 K 61673
HASH JOIN 245 60 K 61664
HASH JOIN 205 K 32 M 28046
TABLE ACCESS FULL OKC.OKC_K_HEADERS_B 5 K 244 K 37
TABLE ACCESS FULL OKC.OKC_K_LINES_B 205 K 23 M 27803
TABLE ACCESS FULL OKC.OKC_K_LINES_B 2 M 168 M 27803
TABLE ACCESS FULL HR.HR_ALL_ORGANIZATION_UNITS 2 K 64 K 8
TABLE ACCESS FULL APPLSYS.FND_USER 13 K 172 K 81
TABLE ACCESS FULL APPLSYS.FND_USER 13 K 172 K 81
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_ITEMS 1 26 3
INDEX RANGE SCAN OKC.OKC_K_ITEMS_N1 1 2
VIEW APPS.XXDBD_OKS_INSTALL_INFO_V 1 861 2
UNION-ALL PARTITION
NESTED LOOPS 1 167 9
NESTED LOOPS 1 108 8
NESTED LOOPS 1 85 7
NESTED LOOPS 1 51 6
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 1 25 3
INDEX UNIQUE SCAN OKC.OKC_K_LINES_B_U1 1 2
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_ITEMS 1 26 3
INDEX RANGE SCAN OKC.OKC_K_ITEMS_N1 1 2
TABLE ACCESS BY INDEX ROWID CSI.CSI_ITEM_INSTANCES 1 34 1
INDEX UNIQUE SCAN CSI.CSI_ITEM_INSTANCES_U01 1
TABLE ACCESS BY INDEX ROWID AR.HZ_PARTY_SITES 1 23 1
INDEX UNIQUE SCAN AR.HZ_PARTY_SITES_U1 1
TABLE ACCESS BY INDEX ROWID AR.HZ_LOCATIONS 1 59 1
INDEX UNIQUE SCAN AR.HZ_LOCATIONS_U1 1
NESTED LOOPS 1 144 8
NESTED LOOPS 1 85 7
NESTED LOOPS 1 51 6
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 1 25 3
INDEX UNIQUE SCAN OKC.OKC_K_LINES_B_U1 1 2
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_ITEMS 1 26 3
INDEX RANGE SCAN OKC.OKC_K_ITEMS_N1 1 2
TABLE ACCESS BY INDEX ROWID CSI.CSI_ITEM_INSTANCES 1 34 1
INDEX UNIQUE SCAN CSI.CSI_ITEM_INSTANCES_U01 1
TABLE ACCESS BY INDEX ROWID AR.HZ_LOCATIONS 1 59 1
INDEX UNIQUE SCAN AR.HZ_LOCATIONS_U1 1
NESTED LOOPS 1 161 8
NESTED LOOPS 1 85 7
NESTED LOOPS 1 51 6
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 1 25 3
INDEX UNIQUE SCAN OKC.OKC_K_LINES_B_U1 1 2
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_ITEMS 1 26 3
INDEX RANGE SCAN OKC.OKC_K_ITEMS_N1 1 2
TABLE ACCESS BY INDEX ROWID CSI.CSI_ITEM_INSTANCES 1 34 1
INDEX UNIQUE SCAN CSI.CSI_ITEM_INSTANCES_U01 1
TABLE ACCESS BY INDEX ROWID AR.HZ_PARTIES 1 76 1
INDEX UNIQUE SCAN AR.HZ_PARTIES_U1 1
TABLE ACCESS BY INDEX ROWID CSI.CSI_ITEM_INSTANCES 1 21 1
INDEX UNIQUE SCAN CSI.CSI_ITEM_INSTANCES_U01 1
And here is the SQL to join:
select * from xxdbd_contract_lines l, xxdbd_contract_flexfields f
where f.service_id (+) = l.service_id
and f.contract_number (+) = l.contract_number
and l.contract_number = 'NL0000014'
Operation Object Name Rows Bytes Cost Object Node In/Out PStart PStop
SELECT STATEMENT Optimizer Mode=CHOOSE 1 49221
HASH JOIN OUTER 1 38 K 49221
VIEW APPS.XXDBD_CONTRACT_LINES 1 19 K 96
NESTED LOOPS OUTER 1 1 K 96
NESTED LOOPS 1 358 94
NESTED LOOPS 1 345 93
NESTED LOOPS 1 332 92
NESTED LOOPS 1 311 91
NESTED LOOPS 1 285 88
NESTED LOOPS 448 72 K 88
NESTED LOOPS OUTER 1 78 4
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_HEADERS_B 1 46 3
INDEX RANGE SCAN OKC.OKC_K_HEADERS_B_U2 1 2
TABLE ACCESS BY INDEX ROWID HR.HR_ALL_ORGANIZATION_UNITS 1 32 1
INDEX UNIQUE SCAN HR.HR_ORGANIZATION_UNITS_PK 1
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 378 32 K 84
INDEX RANGE SCAN XXDBD.XXDBD_OKC_K_LINES_B_N10 378 16
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 1 119
INDEX RANGE SCAN OKC.OKC_K_LINES_B_N2 1 K 32
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_ITEMS 1 26 3
INDEX RANGE SCAN OKC.OKC_K_ITEMS_N1 1 2
TABLE ACCESS BY INDEX ROWID CSI.CSI_ITEM_INSTANCES 1 21 1
INDEX UNIQUE SCAN CSI.CSI_ITEM_INSTANCES_U01 1
TABLE ACCESS BY INDEX ROWID APPLSYS.FND_USER 1 13 1
INDEX UNIQUE SCAN APPLSYS.FND_USER_U1 1
TABLE ACCESS BY INDEX ROWID APPLSYS.FND_USER 1 13 1
INDEX UNIQUE SCAN APPLSYS.FND_USER_U1 1
VIEW APPS.XXDBD_OKS_INSTALL_INFO_V 1 861 2
UNION-ALL PARTITION
NESTED LOOPS 1 167 9
NESTED LOOPS 1 108 8
NESTED LOOPS 1 85 7
NESTED LOOPS 1 51 6
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 1 25 3
INDEX UNIQUE SCAN OKC.OKC_K_LINES_B_U1 1 2
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_ITEMS 1 26 3
INDEX RANGE SCAN OKC.OKC_K_ITEMS_N1 1 2
TABLE ACCESS BY INDEX ROWID CSI.CSI_ITEM_INSTANCES 1 34 1
INDEX UNIQUE SCAN CSI.CSI_ITEM_INSTANCES_U01 1
TABLE ACCESS BY INDEX ROWID AR.HZ_PARTY_SITES 1 23 1
INDEX UNIQUE SCAN AR.HZ_PARTY_SITES_U1 1
TABLE ACCESS BY INDEX ROWID AR.HZ_LOCATIONS 1 59 1
INDEX UNIQUE SCAN AR.HZ_LOCATIONS_U1 1
NESTED LOOPS 1 144 8
NESTED LOOPS 1 85 7
NESTED LOOPS 1 51 6
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 1 25 3
INDEX UNIQUE SCAN OKC.OKC_K_LINES_B_U1 1 2
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_ITEMS 1 26 3
INDEX RANGE SCAN OKC.OKC_K_ITEMS_N1 1 2
TABLE ACCESS BY INDEX ROWID CSI.CSI_ITEM_INSTANCES 1 34 1
INDEX UNIQUE SCAN CSI.CSI_ITEM_INSTANCES_U01 1
TABLE ACCESS BY INDEX ROWID AR.HZ_LOCATIONS 1 59 1
INDEX UNIQUE SCAN AR.HZ_LOCATIONS_U1 1
NESTED LOOPS 1 161 8
NESTED LOOPS 1 85 7
NESTED LOOPS 1 51 6
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 1 25 3
INDEX UNIQUE SCAN OKC.OKC_K_LINES_B_U1 1 2
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_ITEMS 1 26 3
INDEX RANGE SCAN OKC.OKC_K_ITEMS_N1 1 2
TABLE ACCESS BY INDEX ROWID CSI.CSI_ITEM_INSTANCES 1 34 1
INDEX UNIQUE SCAN CSI.CSI_ITEM_INSTANCES_U01 1
TABLE ACCESS BY INDEX ROWID AR.HZ_PARTIES 1 76 1
INDEX UNIQUE SCAN AR.HZ_PARTIES_U1 1
VIEW APPS.XXDBD_CONTRACT_FLEXFIELDS 6 112 K 49124
NESTED LOOPS OUTER 6 80 K 49124
VIEW 6 80 K 49112
HASH JOIN 6 1 K 49112
HASH JOIN 17 K 2 M 20214
TABLE ACCESS FULL OKC.OKC_K_HEADERS_B 5 K 175 K 37
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 17 K 1 M 20162
INDEX SKIP SCAN XXDBD.XXDBD_OKC_K_LINES_B_N10 39 17085
TABLE ACCESS FULL OKC.OKC_K_LINES_B 502 K 34 M 27803
VIEW PUSHED PREDICATE 1 107 2
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_LINES_B 42 3 K 216
NESTED LOOPS 50 5 K 219
TABLE ACCESS BY INDEX ROWID OKC.OKC_K_HEADERS_B 1 33 3
INDEX RANGE SCAN OKC.OKC_K_HEADERS_B_U2 1 2
INDEX RANGE SCAN OKC.OKC_K_LINES_B_N2 1 K 32

Answer 1

DECODE(l.attribute_category, 'Coverage Template Header', l.attribute3) Penalty_Bonus,
DECODE(l.attribute_category, 'Coverage Break', l.attribute1) Mon_Break_Start,
DECODE(l.attribute_category, 'Transaction Type', l.attribute1) Split_Covering,Uh oh, the dreaded entity attibute value, or generic, data model.
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:10678084117056
I am afraid slow performance is a built in feature of this database design, not much you can do in queries.
You could possibly create the views as materialized views and query those instead.
Quote from the linked article
But, how does it perform? Miserably, terribly, horribly. A simple "select
first_name, last_name from person" query is transformed into a 3-table join with
aggregates and all. Further, if the attributes are "NULLABLE" - that is, there
might not be a row in OBJECT_ATTRIBUTES for some attributes, you may have to
outer join instead of just joining which in some cases can remove more optimal
query plans from consideration.
Writing queries might look pretty straightforward, but it's impossible to do in
a performant fashion.