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Help debugging timeout on query

Posted By:      Posted Date: October 22, 2010    Points: 0   Category :Sql Server

An application is timing out on one particular query.  Using Profiler, I see the query as:

exec sp_executesql N'SELECT TOP 1 * FROM Jobs j (NOLOCK) WHERE Clntno=@P1 AND Duration=@P2 AND SvcCode=@P3

AND EXISTS(SELECT 1 FROM Assn a (NOLOCK) WHERE a.Jobno=j.Jobno AND a.DtStart>GETDATE() AND a.Status<> 'CANCEL')

',N'@P1 int,@P2 int,@P3 varchar(3)',75,0,'C'

Running that within Sql Studio returns immediately - no timeout.  So I check the execution plans on the original, it looks like this:

 |--Nested Loops(Left Semi Join, WHERE:([Assn].[Jobno]=[Jobs].[Jobno]))
  |--Filter(WHERE:([Jobs].[Duration]=[@P2] AND [Jobs].[SvcCode]=[@P3]))
  |  |--Nested Loops(Inner Join, OUTER REFERENCES:([j].[Jobno]))  
  |     |--Index Seek(OBJECT:([Jobs].[IX_Job1]), SEEK:([j].[Clntno]=[@P1]) ORDERED FORWARD)AN_ROW   0      1         
  |     |--Clustered Index Seek(OBJECT:([Jobs].[PK__Jobs__30C33EC3]), SEEK:([j].[Jobno]=[Jobs].[Jobno]) LOOKUP ORDERED FORWARD)
  |--Clustered Index Scan(OBJECT:([Assn].[PK__Assn__503BEA1C]), WHERE:

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