SQL Server 2016中的随机慢速查询性能

我会看看你有什么问题

SELECT 
    SUM(A.POSTEDQTY),
    SUM(A.POSTEDVALUE),
    SUM(A.PHYSICALVALUE),
    SUM(A.DEDUCTED),
    SUM(A.RECEIVED),
    SUM(A.RESERVPHYSICAL),
    SUM(A.RESERVORDERED),
    SUM(A.REGISTERED),
    SUM(A.PICKED), 
    SUM(A.ONORDER),
    SUM(A.ORDERED),
    SUM(A.ARRIVED),
    SUM(A.QUOTATIONRECEIPT),
    SUM(A.QUOTATIONISSUE),
    SUM(A.AVAILPHYSICAL),
    SUM(A.AVAILORDERED),
    SUM(A.PHYSICALINVENT) 
FROM 
    INVENTSUM A WITH(NOLOCK) 
WHERE 
    ((A.DATAAREAID = @P1) 
    AND ((A.ITEMID = @P2) 
    AND (A.CLOSED = @P3))) 
    AND EXISTS (SELECT 'x' FROM INVENTDIM B WITH (NOLOCK) 
                WHERE ((B.DATAAREAID = @P4) 
                  AND ((((B.INVENTDIMID = A.INVENTDIMID) AND (B.CONFIGID = @P5)) 
                  AND (B.INVENTLOCATIONID = @P6)) AND (B.INVENTBATCHID = @P7))))

在SQLServerProfiler中，您可以看到相同的查询在0毫秒或超过10000毫秒的时间内执行

如果我尝试用相同的参数直接执行相同的查询10000ms，则需要0ms

发生了什么事

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谢谢！！：

第一次执行查询时，db引擎必须准备语句send to db search数据并返回结果。第二次语句已经准备好并且数据在缓存中。这就是为什么第二次跑步总是更快的原因

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不要让我们读取您的分析器输出。获取正在执行的代码并将其放在您的帖子中，而不是使用4个图像和链接。谢谢！编辑！：您需要获得执行计划这也可能是您遇到的问题。但是同一个查询执行了很多次，首先执行正常，然后是性能差，好了之后，这是一个随机问题，我无法理解。另一个原因通常是磁盘速度慢。

declare @p2 int
set @p2=180157421
declare @p3 int
set @p3=16
declare @p4 int
set @p4=1
declare @p5 int
set @p5=1
exec sp_cursorexecute 1073741895,@p2 output,@p3 output,@p4 output,@p5 output,N'ens',N'V89710821',0,N'ens',N'PO16628',N'AS',N'OFS028748'
select @p2, @p3, @p4, @p5

SELECT SUM(A.POSTEDQTY),SUM(A.POSTEDVALUE),SUM(A.PHYSICALVALUE),SUM(A.DEDUCTED),SUM(A.RECEIVED),SUM(A.RESERVPHYSICAL),SUM(A.RESERVORDERED),SUM(A.REGISTERED),SUM(A.PICKED),SUM(A.ONORDER),SUM(A.ORDERED),SUM(A.ARRIVED),SUM(A.QUOTATIONRECEIPT),SUM(A.QUOTATIONISSUE),SUM(A.AVAILPHYSICAL),SUM(A.AVAILORDERED),SUM(A.PHYSICALINVENT) FROM INVENTSUMDELTA A WHERE ((A.DATAAREAID=@P1) AND (((A.ITEMID=@P2) AND (A.ISAGGREGATED=@P3)) AND (A.TTSID=@P4))) AND EXISTS (SELECT 'x' FROM INVENTDIM B WHERE ((B.DATAAREAID=@P5) AND ((((B.INVENTDIMID=A.INVENTDIMID) AND (B.CONFIGID=@P6)) AND (B.INVENTLOCATIONID=@P7)) AND (B.INVENTBATCHID=@P8))))

declare @p2 int
set @p2=180157423
declare @p3 int
set @p3=16
declare @p4 int
set @p4=1
declare @p5 int
set @p5=1
exec sp_cursorexecute 1073741904,@p2 output,@p3 output,@p4 output,@p5 output,N'ens',N'V89710821',0,5666550353,N'ens',N'PO16628',N'AS',N'OFS028748'
select @p2, @p3, @p4, @p5