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SQL Server Query Help

Posted on 2009-07-15
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Last Modified: 2012-05-07
Hello,
I am running 1 query against SQL Server 2005 and Its taking too much time to return and Eating up all the CPU. The problem with the SQL is we have 2 different database on 1 server and doing a Join and query looks something like this...

and seems like A.TNId = B.NPA + B.DBB + B.RDV is causing all the trouble.

Can someone recommend any better approach to handle this without making changes to db structure? B is really big table with some million records in it.
Select Distinct TNid from db1.dbo.Table A ,  Db2.dbo.Table1 B where 
A.CreateDate > b.CreateDate
And A.TNId = B.NPA + B.DBB + B.RDV

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Question by:Aanvik
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7 Comments
 
LVL 8

Expert Comment

by:Bob Hoffman
ID: 24863896
do you have indexes built on the fields in your where clause?
0
 
LVL 5

Author Comment

by:Aanvik
ID: 24863919
yes, I have non clustered index on these columns.
0
 
LVL 75

Accepted Solution

by:
Aneesh Retnakaran earned 500 total points
ID: 24863958
test it after creating an include index   createDate Include (NPA, DBB, RDV)

or else if you can alter the table, add a computed column for  B.NPA + B.DBB + B.RDV and index createdDate (newComputedColumn )
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LVL 3

Expert Comment

by:TechSinger
ID: 24863965
It doesn't appear that you are using a Join statement.  This can really cause things to slow down.
Try the code in the attached snippet.
 

Select Distinct TNid from db1.dbo.Table A 
JOIN  Db2.dbo.Table1 B ON And A.TNId = B.NPA + B.DBB + B.RDV
where A.CreateDate > b.CreateDate

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0
 
LVL 3

Expert Comment

by:TechSinger
ID: 24863981
Oop, I left the And in.  Let's try that again.
 

Select Distinct TNid from db1.dbo.Table A 
JOIN  Db2.dbo.Table1 B ON A.TNId = B.NPA + B.DBB + B.RDV
where A.CreateDate > b.CreateDate

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0
 
LVL 8

Expert Comment

by:Bob Hoffman
ID: 24864144
Does TNid appear more then once in table 'A'? If not get rid of the "Distinct". If it does can they have a different CreateDate?
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LVL 5

Author Closing Comment

by:Aanvik
ID: 31603986
Thx
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