Query cost is changing when used in a VO

Question

Hi All
I have created the view with the below query
SELECT component_item_name segment1,component_item_id inventory_item_id,organization_id,assembly_item_id
FROM BOMFG_BOM_COMPONENTS WHERE organization_id = :1
AND NVL(END_EFFECTIVE_DATE,SYSDATE ) >= SYSDATE
AND EXISTS
( SELECT 1
FROM apps.fnd_common_lookups fcl, mtl_system_items_b msi
WHERE fcl.lookup_type = 'ITEM_TYPE' AND msi.item_type = fcl.lookup_code
AND msi.inventory_item_id = component_item_id AND msi.organization_id = :2
AND msi.item_type IN ('ATO','OPTIONAL FEAT')
) START WITH assembly_item_id = :3 CONNECT BY PRIOR component_item_id =assembly_item_id GROUP BY component_item_name,component_item_id,organization_id,assembly_item_id
The cost of the above query is just 13 .
attached this VO with one LOV in my page.
when query gets executed while openign the page , the OA Framework is taking above query as
select * from (SELECT component_item_name segment1,component_item_id inventory_item_id,organization_id,assembly_item_id
FROM BOMFG_BOM_COMPONENTS WHERE organization_id = :1
AND NVL(END_EFFECTIVE_DATE,SYSDATE ) >= SYSDATE
AND EXISTS
( SELECT 1
FROM apps.fnd_common_lookups fcl, mtl_system_items_b msi
WHERE fcl.lookup_type = 'ITEM_TYPE' AND msi.item_type = fcl.lookup_code
AND msi.inventory_item_id = component_item_id AND msi.organization_id = :2
AND msi.item_type IN ('ATO','OPTIONAL FEAT')
) START WITH assembly_item_id = :3 CONNECT BY PRIOR component_item_id =assembly_item_id GROUP BY )component_item_name,component_item_id,organization_id,assembly_item_id
and the query cost becomes 21000 .
Because of this, VO takes longer than expected time .
pls suggest how can I handle this ,
Thanks
Naveen
Edited by: user640347 on Mar 10, 2010 12:27 AM

Answer 1

Hi,
Just tell me one thing you execute the query at backend after providing the inputs.
now again after the page has loaded and then again execute the lov query at backend with same input
variables.
Now if the query is same then how can the cost differ?
Verify it.
Thanks,
Gaurav