Hi. We recently upgraded our ERP and went from using SQL Server 2008 to 2014. In addition, we upgraded our hardware (faster, better everything). Suddenly all of the queries we have embedded in various .NET programs are running much, much slower. The query below went from 2 seconds to 5 minutes and 27 seconds. On top of that, I am a total newb, know very little about this stuff, inherited all of these queries and am now responsible for speeding things up.Does anybody have any idea what might have happened to slow things down so much? Can anybody give me pointers (at the most basic level) on how to rewrite queries like the one below to make them faster? Many thanks in advance![quote]Declare @BuyerName as nvarchar(50); Declare @StartDate as date; Declare @EndDate as date; Set @BuyerName = '' + '%'; Set @StartDate = '01/01/2014'; Set @EndDate = '12/31/2014';select V.VendorID,V.Name,PA.Name as Buyer ,(RD.OurQty*RD.OurUnitCost) as RelValue,(select COUNT (*) from agmdb.dbo.agm_calendar AC where AC.dt>=(cast(CASE WHEN dbo.AGM_isdatenull(POR.PromiseDt) = 1 THEN POR.DueDate ELSE POR.PromiseDt END as DateTime)) and AC.dt< RD.receiptdate and AC.isworkday = 1) as DaysLateProm,(select COUNT (*) from agmdb.dbo.agm_calendar AC where AC.dt>=(cast(POR.DueDate as DateTime)) and AC.dt< RD.receiptdate and AC.isworkday = 1) as DaysLateDue,(CASE WHEN (select COUNT (*) from agmdb.dbo.agm_calendar AC where AC.dt>=(cast(CASE WHEN dbo.AGM_isdatenull(POR.PromiseDt) = 1 THEN POR.DueDate ELSE POR.PromiseDt END as DateTime)) and AC.dt< RD.receiptdate and AC.isworkday = 1)>2 THEN 1 ELSE 0 END )as NumOfLateProm,(CASE WHEN (select COUNT (*) from agmdb.dbo.agm_calendar AC where AC.dt>=(cast(POR.DueDate as DateTime)) and AC.dt< RD.receiptdate and AC.isworkday = 1)>2 THEN 1 ELSE 0 END ) as NumOfLateDue,(RD.FailedQty*RD.OurUnitCost*(CASE WHEN isnull(PT.DMRNum,99999)<>99999 and PT.dmrnum <> 0 and isnull(UD14.CheckBox19,0) <> 1 THEN 1 ELSE 0 END)) as RejectValue,(CASE WHEN isnull(PT.DMRNum,99999)<>99999 and PT.dmrnum <> 0 and isnull(UD14.CheckBox19,0) <> 1 THEN 1 ELSE 0 END )AS InspectionFailed fromRcvDtl RDjoin PORel POR on RD.PONum = POR.PONum and RD.POLine = POR.POLine and RD.PORelNum = POR.PORelNum join Vendor V on RD.VendorNum = V.VendorNum join POHeader POH on POR.PONum = POH.PONum join Erp.PurAgent PA on PA.BuyerID = POH.BuyerID left outer join PartTran PT on PT.PONum = RD.PONum and PT.POLine = RD.POLine and PT.PORelNum = RD.PORelNum and PT.PackSlip = RD.PackSlip and PT.PackLine = RD.PackLine and PT.TranType = 'INS-DMR'left outer join Ice.UD14 on UD14.Key1 = PT.DMRNum and UD14.Key5 = '1'where dbo.AGM_isdatenull(RD.ReceiptDate) = 0 and dbo.AGM_isdatenull(POR.DueDate) = 0 and cast(RD.ReceiptDate as date) <> cast( GETDATE() as date)and RD.InspectionPending = 0 and RD.ReceiptDate >= @StartDate and RD.ReceiptDate <= @EndDate and 1 = CASE WHEN @BuyerName = '%' THEN 1 ELSE CASE WHEN PA.name like @buyername THEN 1 ELSE 0 END END[/quote]
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