asked on sql openquery run time is really long
Hi experts,
i have this query that uses a linked server (from_ams) to connect to an oracle database. The query takes 12 minutes to run and I am just comparing about 10 records. I believe what is happening is the openquery is pulling every record from the oracle side which is millions of records. Is there any modifications I can make to this query to compare only the records in the WM_EME_to_AMS_PointsCompareFULL table?
sql query:
select a.HH_NUM, p.Amount, eme.HH_NUM, eme.emeBalance
from WM_EME_to_AMS_PointsCompareFULL a
join CardIDs b on CONVERT(bigint, b.ExtCardID) = a.HH_NUM and b.CardTypeID = 1
inner join points p on b.CustomerPK = p.CustomerPK and ProgramID = 1
inner join Openquery([from_ams], ' SELECT H.HH_NUM, H.SPTSACCU10 as emeBalance FROM EME.HOUSEHOLD H ' ) eme on a.HH_NUM = eme.hh_num
i have this query that uses a linked server (from_ams) to connect to an oracle database. The query takes 12 minutes to run and I am just comparing about 10 records. I believe what is happening is the openquery is pulling every record from the oracle side which is millions of records. Is there any modifications I can make to this query to compare only the records in the WM_EME_to_AMS_PointsCompareFULL table?
sql query:
select a.HH_NUM, p.Amount, eme.HH_NUM, eme.emeBalance
from WM_EME_to_AMS_PointsCompareFULL a
join CardIDs b on CONVERT(bigint, b.ExtCardID) = a.HH_NUM and b.CardTypeID = 1
inner join points p on b.CustomerPK = p.CustomerPK and ProgramID = 1
inner join Openquery([from_ams], ' SELECT H.HH_NUM, H.SPTSACCU10 as emeBalance FROM EME.HOUSEHOLD H ' ) eme on a.HH_NUM = eme.hh_num
SQLDatabasesOracle DatabaseMicrosoft SQL Server
Last Comment
Andrei Fomitchev
ASKER
Andrei,
Thanks for your response. Putting a condition inside the open query would involve too much manual work. Something that I have been doing and hence the question here because it's a pain in the butt.
I am not sure I follow what you are saying on the 2nd part, making a cycle on the sql side. Can you elaborate a little more please? Thank you
Thanks for your response. Putting a condition inside the open query would involve too much manual work. Something that I have been doing and hence the question here because it's a pain in the butt.
I am not sure I follow what you are saying on the 2nd part, making a cycle on the sql side. Can you elaborate a little more please? Thank you
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You can make if work faster if you use some condition inside OpenQuery:
Openquery([from_ams], ' SELECT H.HH_NUM, H.SPTSACCU10 as emeBalance FROM EME.HOUSEHOLD H WHERE H.HH_NUM=...' ) eme
You can make a cycle on SQL Side through a.HH_NUM and fetch a.HH_NUM to some variable @hhNum. Then you can compare that 1 value:
SET @sql = 'SELECT H.HH_NUM, H.SPTSACCU10 as emeBalance FROM EME.HOUSEHOLD H WHERE H.HH_NUM='+CAST(@hhNum AS NVarChar)
and then
OpenQuery([from_ams],@sql)