本文介绍了SQL 查询运行速度比存储过程快的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我最近在生产服务器上修改了一个存储过程，它开始表现不佳，但是当我独立运行查询时，它运行良好.时间差异很大，即比较 5 秒和 10 分钟令人震惊.
I have a stored procedure which I modified recently on my production server and it started performing poorly but when I run the query independently it runs fine. The difference in timing is a lot i.e comparing 5 secs to 10 mins is alarming.
我读了这篇文章SQL Server:查询速度快，但从程序 并尝试使用所有可能的解决方案解决我的问题，但存储过程仍然不起作用，它在时间上有相同的差异.
I read this post SQL Server: Query fast, but slow from procedure and tried resolving my issue with all the possible solutions but still the stored proc does not work it is having the same difference in timings.
任何人都可以让我知道我应该更改什么，以便我的存储过程至少与查询一样快地运行?我对 SQL Server 的这种行为感到有些惊讶
Can anyone let me know what should I change so that my stored proc runs at least as fast as the query? I am a bit surprised by this behavior of SQL Server
好的计划
|--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Assessment].[PK_Assessment] AS [a]), SEEK:([a].[Assessment_Id]=[@AssessmentID]) ORDERED FORWARD)
|--Compute Scalar(DEFINE:([Expr1009]=CONVERT_IMPLICIT(float(53),[Expr1008]-(1),0)))
|--Compute Scalar(DEFINE:([Expr1008]=CONVERT_IMPLICIT(int,[Expr1012],0)))
|--Stream Aggregate(DEFINE:([Expr1012]=Count(*)))
|--Stream Aggregate(GROUP BY:([ci].[Candidate_Instance_Id]))
|--Parallelism(Gather Streams, ORDER BY:([rr].[Candidate_Instance_ID] ASC))
|--Nested Loops(Inner Join, OUTER REFERENCES:([rr].[Candidate_Instance_ID]))
|--Sort(ORDER BY:([rr].[Candidate_Instance_ID] ASC))
| |--Clustered Index Scan(OBJECT:([IndusLynk].[dbo].[Processed_Response].[PK_Processed_Response] AS [rr]), WHERE:([IndusLynk].[dbo].[Processed_Response].[Assessment_ID] as [rr].[Assessment_ID]=[@AssessmentID] AND [IndusLynk].[dbo].[Processed_Response].[Client_ID] as [rr].[Client_ID]=[@UserID]))
|--Stream Aggregate(DEFINE:([ci].[Candidate_Instance_Id]=ANY([IndusLynk].[dbo].[Candidate_Instance].[Candidate_Instance_Id] as [ci].[Candidate_Instance_Id])))
|--Nested Loops(Inner Join, WHERE:([IndusLynk].[dbo].[Candidate_Instance].[Instance_Status] as [ci].[Instance_Status]=[status]))
|--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Candidate_Instance].[PK_Candidate_Instance] AS [ci]), SEEK:([ci].[Candidate_Instance_Id]=[IndusLynk].[dbo].[Processed_Response].[Candidate_Instance_ID] as [rr].[Candidate_Instance_ID]) ORDERED FORWARD)
|--Table Scan(OBJECT:(@AssessmentStatuses))
|--Table Insert(OBJECT:(@ItemDetailTable), SET:([Candidate_Id] = [IndusLynk].[dbo].[Candidate].[Candidate_Id] as [c].[Candidate_Id],[Instance_End_Time] = [IndusLynk].[dbo].[Candidate_Instance].[Instance_End_Time] as [ci].[Instance_End_Time],[Candidate_Instance_Id] = [IndusLynk].[dbo].[Processed_Response].[Candidate_Instance_ID] as [rr].[Candidate_Instance_ID],[Assessment_Id] = [IndusLynk].[dbo].[Processed_Response].[Assessment_ID] as [rr].[Assessment_ID],[OverAllScore] = [Expr1030],[Section_ID] = [IndusLynk].[dbo].[Processed_Response].[Section_ID] as [rr].[Section_ID],[AttempteCount] = [Expr1025],[CorrectCount] = [Expr1026],[Respone_Time] = [Expr1027],[Display_Name] = [Expr1032],[Display_Type_Id] = [IndusLynk].[dbo].[Question].[Display_Type_Id] as [q].[Display_Type_Id],[MaxMarks] = [Expr1033],[Item_ID] = [IndusLynk].[dbo].[Processed_Response].[Item_ID] as [rr].[Item_ID],[Percentile] = NULL))
|--Compute Scalar(DEFINE:([Expr1033]=CONVERT_IMPLICIT(int,[Expr1031],0)))
|--Top(ROWCOUNT est 0)
|--Compute Scalar(DEFINE:([Expr1032]=CONVERT_IMPLICIT(varchar(100),[IndusLynk].[dbo].[Display_Type].[Display_Name] as [dt].[Display_Name],0)))
|--Sort(DISTINCT ORDER BY:([ci].[Instance_End_Time] DESC, [rr].[Candidate_Instance_ID] DESC, [c].[Candidate_Id] ASC, [rr].[Section_ID] ASC, [q].[Display_Type_Id] ASC, [Expr1030] ASC, [Expr1025] ASC, [Expr1026] ASC, [Expr1027] ASC, [dt].[Display_Name] ASC, [Expr1031] ASC, [rr].[Item_ID] ASC))
|--Compute Scalar(DEFINE:([Expr1030]=round([Expr1024],(2)), [Expr1031]=CASE WHEN [IndusLynk].[dbo].[Question].[Display_Type_Id] as [q].[Display_Type_Id]=(8) THEN [Expr1028] ELSE [Expr1029] END))
|--Stream Aggregate(GROUP BY:([rr].[Candidate_Instance_ID], [c].[First_Name], [c].[Last_Name], [rr].[Section_ID], [q].[Display_Type_Id], [rr].[Item_ID]) DEFINE:([Expr1024]=SUM([Expr1034]), [Expr1025]=SUM([Expr1035]), [Expr1026]=SUM([Expr1036]), [Expr1027]=SUM([Expr1037]), [Expr1028]=SUM([Expr1038]), [Expr1029]=MAX([Expr1039]), [ci].[Instance_End_Time]=ANY([IndusLynk].[dbo].[Candidate_Instance].[Instance_End_Time] as [ci].[Instance_End_Time]), [c].[Candidate_Id]=ANY([IndusLynk].[dbo].[Candidate].[Candidate_Id] as [c].[Candidate_Id]), [rr].[Assessment_ID]=ANY([IndusLynk].[dbo].[Processed_Response].[Assessment_ID] as [rr].[Assessment_ID]), [dt].[Display_Name]=ANY([IndusLynk].[dbo].[Display_Type].[Display_Name] as [dt].[Display_Name])))
|--Compute Scalar(DEFINE:([Expr1038]=CASE WHEN isnull([IndusLynk].[dbo].[Answer].[Answer_Weightage] as [ans].[Answer_Weightage],(0.000000000000000e+000))>(-1.000000000000000e+000) THEN isnull([IndusLynk].[dbo].[Answer].[Answer_Weightage] as [ans].[Answer_Weightage],(0.000000000000000e+000)) ELSE (0.000000000000000e+000) END, [Expr1039]=isnull([IndusLynk].[dbo].[Answer].[Answer_Weightage] as [ans].[Answer_Weightage],(0.000000000000000e+000))))
|--Nested Loops(Left Outer Join, OUTER REFERENCES:([id].[Answer_Id], [Expr1052]) WITH ORDERED PREFETCH)
|--Nested Loops(Left Outer Join, OUTER REFERENCES:([rr].[Item_ID]))
| |--Sort(ORDER BY:([rr].[Candidate_Instance_ID] ASC, [c].[First_Name] ASC, [c].[Last_Name] ASC, [rr].[Section_ID] ASC, [q].[Display_Type_Id] ASC, [rr].[Item_ID] ASC))
| | |--Stream Aggregate(GROUP BY:([rr].[Processed_Response_ID]) DEFINE:([rr].[Candidate_Instance_ID]=ANY([IndusLynk].[dbo].[Processed_Response].[Candidate_Instance_ID] as [rr].[Candidate_Instance_ID]), [rr].[Assessment_ID]=ANY([IndusLynk].[dbo].[Processed_Response].[Assessment_ID] as [rr].[Assessment_ID]), [rr].[Section_ID]=ANY([IndusLynk].[dbo].[Processed_Response].[Section_ID] as [rr].[Section_ID]), [rr].[Item_ID]=ANY([IndusLynk].[dbo].[Processed_Response].[Item_ID] as [rr].[Item_ID]), [ci].[Instance_End_Time]=ANY([IndusLynk].[dbo].[Candidate_Instance].[Instance_End_Time] as [ci].[Instance_End_Time]), [c].[Candidate_Id]=ANY([IndusLynk].[dbo].[Candidate].[Candidate_Id] as [c].[Candidate_Id]), [c].[First_Name]=ANY([IndusLynk].[dbo].[Candidate].[First_Name] as [c].[First_Name]), [c].[Last_Name]=ANY([IndusLynk].[dbo].[Candidate].[Last_Name] as [c].[Last_Name]), [q].[Display_Type_Id]=ANY([IndusLynk].[dbo].[Question].[Display_Type_Id] as [q].[Display_Type_Id]), [dt].[Display_Type_Id]=ANY([IndusLynk].[dbo].[Display_Type].[Display_Type_Id] as [dt].[Display_Type_Id]), [dt].[Display_Name]=ANY([IndusLynk].[dbo].[Display_Type].[Display_Name] as [dt].[Display_Name]), [Expr1034]=ANY([Expr1034]), [Expr1035]=ANY([Expr1035]), [Expr1036]=ANY([Expr1036]), [Expr1037]=ANY([Expr1037])))
| | |--Nested Loops(Inner Join, OUTER REFERENCES:([ci].[Candidate_Id]))
| | |--Nested Loops(Inner Join, OUTER REFERENCES:([q].[Display_Type_Id]))
| | | |--Nested Loops(Inner Join, OUTER REFERENCES:([i].[Question_Id]))
| | | | |--Nested Loops(Inner Join, OUTER REFERENCES:([rr].[Item_ID]))
| | | | | |--Nested Loops(Inner Join, WHERE:([IndusLynk].[dbo].[Candidate_Instance].[Instance_Status] as [ci].[Instance_Status]=[status]))
| | | | | | |--Nested Loops(Inner Join, OUTER REFERENCES:([rr].[Candidate_Instance_ID]))
| | | | | | | |--Compute Scalar(DEFINE:([Expr1034]=isnull([IndusLynk].[dbo].[Processed_Response].[Marks_Obtained] as [rr].[Marks_Obtained],(0.000000000000000e+000)), [Expr1035]=CASE WHEN [IndusLynk].[dbo].[Processed_Response].[Display_Type_ID] as [rr].[Display_Type_ID]=(2) THEN CASE WHEN [IndusLynk].[dbo].[Processed_Response].[IsAttempted] as [rr].[IsAttempted] IS NULL THEN CASE WHEN [IndusLynk].[dbo].[Processed_Response].[Response_Time] as [rr].[Response_Time]>(0.000000000000000e+000) THEN (1) ELSE (0) END ELSE CONVERT_IMPLICIT(int,isnull([IndusLynk].[dbo].[Processed_Response].[IsAttempted] as [rr].[IsAttempted],(0)),0) END ELSE CONVERT_IMPLICIT(int,isnull([IndusLynk].[dbo].[Processed_Response].[IsAttempted] as [rr].[IsAttempted],(0)),0) END, [Expr1036]=CASE WHEN [IndusLynk].[dbo].[Processed_Response].[Marks_Obtained] as [rr].[Marks_Obtained]>(0.000000000000000e+000) THEN (1) ELSE (0) END, [Expr1037]=isnull([IndusLynk].[dbo].[Processed_Response].[Response_Time] as [rr].[Response_Time],(0.000000000000000e+000))))
| | | | | | | | |--Clustered Index Scan(OBJECT:([IndusLynk].[dbo].[Processed_Response].[PK_Processed_Response] AS [rr]), WHERE:([IndusLynk].[dbo].[Processed_Response].[Assessment_ID] as [rr].[Assessment_ID]=[@AssessmentID] AND [IndusLynk].[dbo].[Processed_Response].[Client_ID] as [rr].[Client_ID]=[@UserID]) ORDERED FORWARD)
| | | | | | | |--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Candidate_Instance].[PK_Candidate_Instance] AS [ci]), SEEK:([ci].[Candidate_Instance_Id]=[IndusLynk].[dbo].[Processed_Response].[Candidate_Instance_ID] as [rr].[Candidate_Instance_ID]) ORDERED FORWARD)
| | | | | | |--Table Scan(OBJECT:(@AssessmentStatuses))
| | | | | |--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Item].[PK_Item] AS [i]), SEEK:([i].[Item_Id]=[IndusLynk].[dbo].[Processed_Response].[Item_ID] as [rr].[Item_ID]) ORDERED FORWARD)
| | | | |--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Question].[PK_Question] AS [q]), SEEK:([q].[Question_Id]=[IndusLynk].[dbo].[Item].[Question_Id] as [i].[Question_Id]) ORDERED FORWARD)
| | | |--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Display_Type].[PK_Display_Type] AS [dt]), SEEK:([dt].[Display_Type_Id]=[IndusLynk].[dbo].[Question].[Display_Type_Id] as [q].[Display_Type_Id]) ORDERED FORWARD)
| | |--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Candidate].[PK_Candidate] AS [c]), SEEK:([c].[Candidate_Id]=[IndusLynk].[dbo].[Candidate_Instance].[Candidate_Id] as [ci].[Candidate_Id]) ORDERED FORWARD)
| |--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Item_Details].[PK_Item_Details] AS [id]), SEEK:([id].[Item_Id]=[IndusLynk].[dbo].[Processed_Response].[Item_ID] as [rr].[Item_ID]) ORDERED FORWARD)
|--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Answer].[PK_Answer] AS [ans]), SEEK:([ans].[Answer_Id]=[IndusLynk].[dbo].[Item_Details].[Answer_Id] as [id].[Answer_Id]) ORDERED FORWARD)
|--Table Insert(OBJECT:(@SectionDetailTable), SET:([Candidate_Id] = [IndusLynk].[dbo].[Candidate].[Candidate_Id] as [c].[Candidate_Id],[Candidate_Instance_Id] = [IndusLynk].[dbo].[Processed_Response].[Candidate_Instance_ID] as [rr].[Candidate_Instance_ID],[Assessment_Id] = [IndusLynk].[dbo].[Processed_Response].[Assessment_ID] as [rr].[Assessment_ID],[OverAllScore] = [Expr1025],[Section_ID] = [IndusLynk].[dbo].[Processed_Response].[Section_ID] as [rr].[Section_ID],[Section_Name] = [Expr1028],[Section_Description] = [Expr1029],[AttempteCount] = [Expr1020],[CorrectCount] = [Expr1021],[Respone_Time] = [Expr1026],[TotaQuestionCount] = [Expr1023],[MaxMarks] = [Expr1027],[Percentile] = NULL))
|--Compute Scalar(DEFINE:([Expr1025]=round([Expr1019],(2)), [Expr1026]=CASE WHEN [IndusLynk].[dbo].[Section].[Section_Duration] as [s].[Section_Duration]<>(0) THEN CASE WHEN [Expr1022]/(6.000000000000000e+001)>CONVERT_IMPLICIT(float(53),[IndusLynk].[dbo].[Section].[Section_Duration] as [s].[Section_Duration],0) THEN CONVERT_IMPLICIT(float(53),[IndusLynk].[dbo].[Section].[Section_Duration] as [s].[Section_Duration],0) ELSE [Expr1022]/(6.000000000000000e+001) END ELSE [Expr1022]/(6.000000000000000e+001) END, [Expr1027]=CONVERT(float(53),[Expr1024],0)))
|--Top(ROWCOUNT est 0)
|--Sort(ORDER BY:([ci].[Instance_End_Time] DESC, [rr].[Candidate_Instance_ID] DESC, [c].[Candidate_Id] ASC, [rr].[Section_ID] ASC))
|--Compute Scalar(DEFINE:([Expr1028]=CONVERT_IMPLICIT(varchar(100),[IndusLynk].[dbo].[Section].[Section_Title] as [s].[Section_Title],0), [Expr1029]=CONVERT_IMPLICIT(varchar(100),[IndusLynk].[dbo].[Section].[Section_Description] as [s].[Section_Description],0)))
|--Compute Scalar(DEFINE:([Expr1023]=CONVERT_IMPLICIT(int,[Expr1047],0), [Expr1024]=CASE WHEN [Expr1048]=(0) THEN NULL ELSE [Expr1049] END))
|--Stream Aggregate(GROUP BY:([rr].[Candidate_Instance_ID], [c].[First_Name], [c].[Last_Name], [rr].[Section_ID]) DEFINE:([Expr1047]=Count(*), [Expr1019]=SUM([Expr1030]), [Expr1020]=SUM([Expr1031]), [Expr1021]=SUM([Expr1032]), [Expr1022]=SUM([Expr1033]), [Expr1048]=COUNT_BIG(@ItemDetailTable.[MaxMarks] as [id].[MaxMarks]), [Expr1049]=SUM(@ItemDetailTable.[MaxMarks] as [id].[MaxMarks]), [ci].[Instance_End_Time]=ANY([IndusLynk].[dbo].[Candidate_Instance].[Instance_End_Time] as [ci].[Instance_End_Time]), [c].[Candidate_Id]=ANY([IndusLynk].[dbo].[Candidate].[Candidate_Id] as [c].[Candidate_Id]), [rr].[Assessment_ID]=ANY([IndusLynk].[dbo].[Processed_Response].[Assessment_ID] as [rr].[Assessment_ID]), [s].[Section_Title]=ANY([IndusLynk].[dbo].[Section].[Section_Title] as [s].[Section_Title]), [s].[Section_Description]=ANY([IndusLynk].[dbo].[Section].[Section_Description] as [s].[Section_Description]), [s].[Section_Duration]=ANY([IndusLynk].[dbo].[Section].[Section_Duration] as [s].[Section_Duration])))
|--Nested Loops(Inner Join, WHERE:([IndusLynk].[dbo].[Processed_Response].[Candidate_Instance_ID] as [rr].[Candidate_Instance_ID]=@ItemDetailTable.[Candidate_Instance_Id] as [id].[Candidate_Instance_Id] AND [IndusLynk].[dbo].[Processed_Response].[Section_ID] as [rr].[Section_ID]=@ItemDetailTable.[Section_ID] as [id].[Section_ID] AND @ItemDetailTable.[Item_ID] as [id].[Item_ID]=[IndusLynk].[dbo].[Processed_Response].[Item_ID] as [rr].[Item_ID]))
|--Sort(ORDER BY:([rr].[Candidate_Instance_ID] ASC, [c].[First_Name] ASC, [c].[Last_Name] ASC, [rr].[Section_ID] ASC))
| |--Nested Loops(Inner Join, OUTER REFERENCES:([ci].[Candidate_Id]))
| |--Nested Loops(Left Semi Join, WHERE:([IndusLynk].[dbo].[Candidate_Instance].[Instance_Status] as [ci].[Instance_Status]=[status]))
| | |--Nested Loops(Inner Join, OUTER REFERENCES:([rr].[Candidate_Instance_ID]))
| | | |--Nested Loops(Inner Join, OUTER REFERENCES:([s].[Section_Id]))
| | | | |--Nested Loops(Inner Join, OUTER REFERENCES:([rr].[Section_ID]))
| | | | | |--Compute Scalar(DEFINE:([Expr1030]=isnull([IndusLynk].[dbo].[Processed_Response].[Marks_Obtained] as [rr].[Marks_Obtained],(0.000000000000000e+000)), [Expr1031]=CASE WHEN [IndusLynk].[dbo].[Processed_Response].[Display_Type_ID] as [rr].[Display_Type_ID]=(2) THEN CASE WHEN [IndusLynk].[dbo].[Processed_Response].[IsAttempted] as [rr].[IsAttempted] IS NULL THEN CASE WHEN [IndusLynk].[dbo].[Processed_Response].[Response_Time] as [rr].[Response_Time]>(0.000000000000000e+000) THEN (1) ELSE (0) END ELSE CONVERT_IMPLICIT(int,isnull([IndusLynk].[dbo].[Processed_Response].[IsAttempted] as [rr].[IsAttempted],(0)),0) END ELSE CONVERT_IMPLICIT(int,isnull([IndusLynk].[dbo].[Processed_Response].[IsAttempted] as [rr].[IsAttempted],(0)),0) END, [Expr1032]=CASE WHEN [IndusLynk].[dbo].[Processed_Response].[Marks_Obtained] as [rr].[Marks_Obtained]>(0.000000000000000e+000) THEN (1) ELSE (0) END, [Expr1033]=isnull([IndusLynk].[dbo].[Processed_Response].[Response_Time] as [rr].[Response_Time],(0.000000000000000e+000))))
| | | | | | |--Clustered Index Scan(OBJECT:([IndusLynk].[dbo].[Processed_Response].[PK_Processed_Response] AS [rr]), WHERE:([IndusLynk].[dbo].[Processed_Response].[Assessment_ID] as [rr].[Assessment_ID]=[@AssessmentID] AND [IndusLynk].[dbo].[Processed_Response].[Client_ID] as [rr].[Client_ID]=[@UserID]))
| | | | | |--Index Seek(OBJECT:([IndusLynk].[dbo].[Section].[IX_Section] AS [s]), SEEK:([s].[Assessment_Id]=[@AssessmentID] AND [s].[Section_Id]=[IndusLynk].[dbo].[Processed_Response].[Section_ID] as [rr].[Section_ID]) ORDERED FORWARD)
| | | | |--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Section].[PK_Section] AS [s]), SEEK:([s].[Section_Id]=[IndusLynk].[dbo].[Section].[Section_Id] as [s].[Section_Id]) LOOKUP ORDERED FORWARD)
| | | |--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Candidate_Instance].[PK_Candidate_Instance] AS [ci]), SEEK:([ci].[Candidate_Instance_Id]=[IndusLynk].[dbo].[Processed_Response].[Candidate_Instance_ID] as [rr].[Candidate_Instance_ID]) ORDERED FORWARD)
| | |--Table Scan(OBJECT:(@AssessmentStatuses))
| |--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Candidate].[PK_Candidate] AS [c]), SEEK:([c].[Candidate_Id]=[IndusLynk].[dbo].[Candidate_Instance].[Candidate_Id] as [ci].[Candidate_Id]) ORDERED FORWARD)
|--Table Scan(OBJECT:(@ItemDetailTable AS [id]))
|--Table Insert(OBJECT:(@AssessmentDetailTable), SET:([Candidate_Id] = [IndusLynk].[dbo].[Candidate].[Candidate_Id] as [c].[Candidate_Id],[Candidate_Instance_Id] = [IndusLynk].[dbo].[Processed_Response].[Candidate_Instance_ID] as [rr].[Candidate_Instance_ID],[Assessment_Id] = [IndusLynk].[dbo].[Processed_Response].[Assessment_ID] as [rr].[Assessment_ID],[First_Name] = [IndusLynk].[dbo].[Candidate].[First_Name] as [c].[First_Name],[Last_Name] = [Expr1018],[OverAllScore] = [Expr1019],[Instance_Start_Time] = [Expr1020],[AttempteCount] = [Expr1015],[CorrectCount] = [Expr1016],[Respone_Time] = [Expr1021],[InvitationID] = [IndusLynk].[dbo].[Candidate_Instance].[Invitation_Id] as [ci].[Invitation_Id],[Email_ID] = [Expr1023],[RowNumber] = [Expr1024],[Percentile] = NULL))
|--Compute Scalar(DEFINE:([Expr1024]=CONVERT_IMPLICIT(int,[Expr1022],0)))
|--Top(ROWCOUNT est 0)
|--Compute Scalar(DEFINE:([Expr1023]=CONVERT_IMPLICIT(varchar(50),[IndusLynk].[dbo].[Candidate].[Email_Id] as [c].[Email_Id],0)))
|--Sequence Project(DEFINE:([Expr1022]=row_number))
|--Segment
|--Sort(ORDER BY:([ci].[Instance_End_Time] DESC, [rr].[Candidate_Instance_ID] DESC, [c].[Candidate_Id] ASC))
|--Compute Scalar(DEFINE:([Expr1018]=isnull([IndusLynk].[dbo].[Candidate].[Last_Name] as [c].[Last_Name],''), [Expr1019]=round([Expr1014],(2)), [Expr1020]=isnull([IndusLynk].[dbo].[Candidate_Instance].[Instance_Start_Time] as [ci].[Instance_Start_Time],dateadd(minute, -[@AssessmentDuration],[IndusLynk].[dbo].[Candidate_Instance].[Instance_End_Time] as [ci].[Instance_End_Time])), [Expr1021]=CASE WHEN [Expr1017]/(6.000000000000000e+001)>CONVERT_IMPLICIT(float(53),[@AssessmentDuration],0) THEN CONVERT_IMPLICIT(float(53),[@AssessmentDuration],0) ELSE [Expr1017]/(6.000000000000000e+001) END))
|--Stream Aggregate(GROUP BY:([c].[Email_Id], [rr].[Candidate_Instance_ID]) DEFINE:([Expr1014]=SUM([Expr1026]), [Expr1015]=SUM([Expr1027]), [Expr1016]=SUM([Expr1028]), [Expr1017]=SUM([Expr1029]), [ci].[Instance_End_Time]=ANY([IndusLynk].[dbo].[Candidate_Instance].[Instance_End_Time] as [ci].[Instance_End_Time]), [c].[Candidate_Id]=ANY([IndusLynk].[dbo].[Candidate].[Candidate_Id] as [c].[Candidate_Id]), [rr].[Assessment_ID]=ANY([IndusLynk].[dbo].[Processed_Response].[Assessment_ID] as [rr].[Assessment_ID]), [c].[First_Name]=ANY([IndusLynk].[dbo].[Candidate].[First_Name] as [c].[First_Name]), [c].[Last_Name]=ANY([IndusLynk].[dbo].[Candidate].[Last_Name] as [c].[Last_Name]), [ci].[Instance_Start_Time]=ANY([IndusLynk].[dbo].[Candidate_Instance].[Instance_Start_Time] as [ci].[Instance_Start_Time]), [ci].[Invitation_Id]=ANY([IndusLynk].[dbo].[Candidate_Instance].[Invitation_Id] as [ci].[Invitation_Id])))
|--Sort(ORDER BY:([c].[Email_Id] ASC, [rr].[Candidate_Instance_ID] ASC))
|--Nested Loops(Inner Join, OUTER REFERENCES:([ci].[Candidate_Id]))
|--Nested Loops(Left Semi Join, WHERE:([IndusLynk].[dbo].[Candidate_Instance].[Instance_Status] as [ci].[Instance_Status]=[status]))
| |--Nested Loops(Inner Join, OUTER REFERENCES:([rr].[Candidate_Instance_ID]))
| | |--Compute Scalar(DEFINE:([Expr1026]=isnull([IndusLynk].[dbo].[Processed_Response].[Marks_Obtained] as [rr].[Marks_Obtained],(0.000000000000000e+000)), [Expr1027]=CASE WHEN [IndusLynk].[dbo].[Processed_Response].[Display_Type_ID] as [rr].[Display_Type_ID]=(2) THEN CASE WHEN [IndusLynk].[dbo].[Processed_Response].[IsAttempted] as [rr].[IsAttempted] IS NULL THEN CASE WHEN [IndusLynk].[dbo].[Processed_Response].[Response_Time] as [rr].[Response_Time]>(0.000000000000000e+000) THEN (1) ELSE (0) END ELSE CONVERT_IMPLICIT(int,isnull([IndusLynk].[dbo].[Processed_Response].[IsAttempted] as [rr].[IsAttempted],(0)),0) END ELSE CONVERT_IMPLICIT(int,isnull([IndusLynk].[dbo].[Processed_Response].[IsAttempted] as [rr].[IsAttempted],(0)),0) END, [Expr1028]=CASE WHEN [IndusLynk].[dbo].[Processed_Response].[Marks_Obtained] as [rr].[Marks_Obtained]>(0.000000000000000e+000) THEN (1) ELSE (0) END, [Expr1029]=isnull([IndusLynk].[dbo].[Processed_Response].[Response_Time] as [rr].[Response_Time],(0.000000000000000e+000))))
| | | |--Clustered Index Scan(OBJECT:([IndusLynk].[dbo].[Processed_Response].[PK_Processed_Response] AS [rr]), WHERE:([IndusLynk].[dbo].[Processed_Response].[Assessment_ID] as [rr].[Assessment_ID]=[@AssessmentID] AND [IndusLynk].[dbo].[Processed_Response].[Client_ID] as [rr].[Client_ID]=[@UserID]))
| | |--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Candidate_Instance].[PK_Candidate_Instance] AS [ci]), SEEK:([ci].[Candidate_Instance_Id]=[IndusLynk].[dbo].[Processed_Response].[Candidate_Instance_ID] as [rr].[Candidate_Instance_ID]) ORDERED FORWARD)
| |--Table Scan(OBJECT:(@AssessmentStatuses))
|--Clustered Index Seek(OBJECT:([IndusLynk].[dbo].[Candidate].[PK_Candidate] AS [c]), SEEK:([c].[Candidate_Id]=[IndusLynk].[dbo].[Candidate_Instance].[Candidate_Id] as [ci].[Candidate_Id]) ORDERED FORWARD)
|--Table Insert(OBJECT:(@AssessmentFilteredTable), SET:([Candidate_Id] = [Candidate_Id],[Candidate_Instance_Id] = [Candidate_Instance_Id],[Assessment_Id] = [Assessment_Id],[First_Name] = [First_Name],[Last_Name] = [Last_Name],[OverAllScore] = [OverAllScore],[Instance_Start_Time] = [Instance_Start_Time],[AttempteCount] = [AttempteCount],[CorrectCount] = [CorrectCount],[Respone_Time] = [Respone_Time],[Percentile] = [Percentile],[RowNumber] = [Expr1009]))
|--Compute Scalar(DEFINE:([Expr1009]=CONVERT_IMPLICIT(int,[Expr1008],0)))
|--Top(ROWCOUNT est 0)
|--Sequence Project(DEFINE:([Expr1008]=row_number))
|--Segment
|--Sort(ORDER BY:([RowNumber] ASC))
|--Compute Scalar(DEFINE:([Expr1003]=CASE WHEN @SectionDetailTable.[OverAllScore] as [i].[OverAllScore]>(0.000000000000000e+000) THEN isnull(@SectionDetailTable.[Percentile] as [i].[Percentile],(1.000000000000000e+002)) ELSE isnull(@SectionDetailTable.[Percentile] as [i].[Percentile],(0.000000000000000e+000)) END))
|--Table Scan(OBJECT:(@SectionDetailTable AS [i]))
|--Compute Scalar(DEFINE:([Expr1004]=CASE WHEN [OverAllScore]>(0.000000000000000e+000) THEN isnull([Percentile],(1.000000000000000e+002)) ELSE isnull([Percentile],(0.000000000000000e+000)) END))
|--Table Scan(OBJECT:(@AssessmentDetailTable))
|--Compute Scalar(DEFINE:([Expr1006]=[Expr1004]))
|--Compute Scalar(DEFINE:([Expr1004]=CONVERT_IMPLICIT(int,[Expr1009],0)))
|--Stream Aggregate(DEFINE:([Expr1009]=Count(*)))
|--Table Scan(OBJECT:(@AssessmentDetailTable))
推荐答案
SP 是预编译的，可能使用了坏"查询计划，这对传递给 SP 的参数不利.您可以在 SP 内部的查询上添加 OPTION (RECOMPILE)，以强制 SQL Server 通过查询优化器重新运行查询并找到给定参数的最佳查询.
SPs are precompiled, it may be that a "bad" query plan is used which is not good for the arguments passed into the SP. You can add a OPTION (RECOMPILE) on the queries inside the SP to force SQL Server to re-run the query through the query optimizer and find the best query for the given parameters.
请参阅此处或此处 一些示例和背景信息...
See here or here for some examples and background info...
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