查詢運行速度快:SQL服務器:查詢速度快,但速度緩慢的過程
DECLARE @SessionGUID uniqueidentifier
SET @SessionGUID = 'BCBA333C-B6A1-4155-9833-C495F22EA908'
SELECT *
FROM Report_Opener
WHERE SessionGUID = @SessionGUID
ORDER BY CurrencyTypeOrder, Rank
子樹成本:0.502
但是把相同的SQL存儲過程運行速度慢,並用完全不同的執行計劃
CREATE PROCEDURE dbo.ViewOpener @SessionGUID uniqueidentifier AS
SELECT *
FROM Report_Opener
WHERE SessionGUID = @SessionGUID
ORDER BY CurrencyTypeOrder, Rank
EXECUTE ViewOpener @SessionGUID
子樹成本:19.2
我已經運行
sp_recompile ViewOpener
它仍然運行在相同的(嚴重),而且我也改變了存儲 過程
CREATE PROCEDURE dbo.ViewOpener @SessionGUID uniqueidentifier AS
SELECT *, 'recompile please'
FROM Report_Opener
WHERE SessionGUID = @SessionGUID
ORDER BY CurrencyTypeOrder, Rank
,然後再返回,試圖欺騙真它進入重新編譯。
我已經刪除並重新創建存儲過程,以便讓它生成一個新的計劃。
我試圖重新編譯迫,和防止參數嗅探,通過使用誘餌變量:
CREATE PROCEDURE dbo.ViewOpener @SessionGUID uniqueidentifier AS
DECLARE @SessionGUIDbitch uniqueidentifier
SET @SessionGUIDbitch = @SessionGUID
SELECT *
FROM Report_Opener
WHERE SessionGUID = @SessionGUIDbitch
ORDER BY CurrencyTypeOrder, Rank
我還試圖限定存儲過程WITH RECOMPILE
:
CREATE PROCEDURE dbo.ViewOpener @SessionGUID uniqueidentifier
WITH RECOMPILE
AS
SELECT *
FROM Report_Opener
WHERE SessionGUID = @SessionGUID
ORDER BY CurrencyTypeOrder, Rank
因此,它的計劃永遠不會被緩存,並且我試過在執行時強制重新編譯:
EXECUTE ViewOpener @SessionGUID WITH RECOMPILE
哪沒有幫助。
我試過的程序轉換爲動態SQL:
CREATE PROCEDURE dbo.ViewOpener @SessionGUID uniqueidentifier
WITH RECOMPILE AS
DECLARE @SQLString NVARCHAR(500)
SET @SQLString = N'SELECT *
FROM Report_OpenerTest
WHERE SessionGUID = @SessionGUID
ORDER BY CurrencyTypeOrder, Rank'
EXECUTE sp_executesql @SQLString,
N'@SessionGUID uniqueidentifier',
@SessionGUID
這並沒有幫助。
實體「Report_Opener
」是未被索引的視圖。該視圖僅引用基礎表。沒有表格包含計算列,索引或其他。
對於它的地獄我試圖與
SET ANSI_NULLS ON
SET QUOTED_IDENTIFER ON
沒有解決它創建視圖。
它是如何
- 查詢是快速
- 移動所述查詢的圖,從該視圖從視圖從存儲過程中選擇是快速
- 選擇是40倍慢?
我試着將視圖的定義直接移動到存儲過程中(違反了3個業務規則,並且破壞了一個重要的封裝),並且僅使其速度降低了大約6倍。
爲什麼存儲過程版本太慢?與其他類型的特別SQL相比,運行臨時SQL的SQL Server可能會更快嗎?
我真的不想
- 嵌入代碼的SQL
變化的代碼在所有
Microsoft SQL Server 2000 - 8.00.2050 (Intel X86) Mar 7 2008 21:29:56 Copyright (c) 1988-2003 Microsoft Corporation Standard Edition on Windows NT 5.2 (Build 3790: Service Pack 2)
但是可以考慮SQL Server在無法運行速度與運行查詢的SQL Sever一樣快,如果不是參數嗅探。
我的下一次嘗試將有StoredProcedureA
通話StoredProcedureB
通話StoredProcedureC
呼叫StoredProcedureD
查詢視圖。
如果失敗了,請讓存儲過程調用存儲過程,調用UDF,調用UDF,調用存儲過程,調用UDF來查詢視圖。
從QA快速歸納起來,以下運行,但放到一個存儲過程時慢:
原:
--Runs fine outside of a stored procedure
SELECT *
FROM Report_OpenerTest
WHERE SessionGUID = @SessionGUID
ORDER BY CurrencyTypeOrder, Rank
sp_executesql
:
--Runs fine outside of a stored procedure
DECLARE @SQLString NVARCHAR(500)
SET @SQLString = N'SELECT *
FROM Report_OpenerTest
WHERE SessionGUID = @SessionGUID
ORDER BY CurrencyTypeOrder, Rank'
EXECUTE sp_executesql @SQLString,
N'@SessionGUID uniqueidentifier',
@SessionGUID
EXEC(@sql)
:
--Runs fine outside of a stored procedure
DECLARE @sql NVARCHAR(500)
SET @sql = N'SELECT *
FROM Report_OpenerTest
WHERE SessionGUID = '''+CAST(@SessionGUID AS varchar(50))+'''
ORDER BY CurrencyTypeOrder, Rank'
EXEC(@sql)
執行計劃
的好計劃:
|--Sort(ORDER BY:([Expr1020] ASC, [Currencies].[Rank] ASC))
|--Compute Scalar(DEFINE:([Expr1020]=If ([Currencies].[CurrencyType]='ctCanadianCash') then 1 else If ([Currencies].[CurrencyType]='ctMiscellaneous') then 2 else If ([Currencies].[CurrencyType]='ctTokens') then 3 else If ([Currencies].[CurrencyType]
|--Nested Loops(Left Outer Join, OUTER REFERENCES:([Openers].[OpenerGUID]))
|--Filter(WHERE:((([Currencies].[IsActive]<>0 AND [Currencies].[OnOpener]<>0) AND ((((((([Currencies].[CurrencyType]='ctUSCoin' OR [Currencies].[CurrencyType]='ctMiscellaneousUS') OR [Currencies].[CurrencyType]='ctUSCash') OR [Currencies].
| |--Nested Loops(Left Outer Join, OUTER REFERENCES:([Currencies].[CurrencyGUID], [Openers].[OpenerGUID]) WITH PREFETCH)
| |--Nested Loops(Left Outer Join)
| | |--Bookmark Lookup(BOOKMARK:([Bmk1016]), OBJECT:([GrobManagementSystemLive].[dbo].[Windows]))
| | | |--Nested Loops(Inner Join, OUTER REFERENCES:([Openers].[WindowGUID]))
| | | |--Bookmark Lookup(BOOKMARK:([Bmk1014]), OBJECT:([GrobManagementSystemLive].[dbo].[Openers]))
| | | | |--Index Seek(OBJECT:([GrobManagementSystemLive].[dbo].[Openers].[IX_Openers_SessionGUID]), SEEK:([Openers].[SessionGUID]=[@SessionGUID]) ORDERED FORWARD)
| | | |--Index Seek(OBJECT:([GrobManagementSystemLive].[dbo].[Windows].[IX_Windows]), SEEK:([Windows].[WindowGUID]=[Openers].[WindowGUID]) ORDERED FORWARD)
| | |--Clustered Index Scan(OBJECT:([GrobManagementSystemLive].[dbo].[Currencies].[IX_Currencies_CurrencyType]))
| |--Clustered Index Seek(OBJECT:([GrobManagementSystemLive].[dbo].[OpenerDetails].[IX_OpenerDetails_OpenerGUIDCurrencyGUID]), SEEK:([OpenerDetails].[OpenerGUID]=[Openers].[OpenerGUID] AND [OpenerDetails].[CurrencyGUID]=[Currenc
|--Hash Match(Cache, HASH:([Openers].[OpenerGUID]), RESIDUAL:([Openers].[OpenerGUID]=[Openers].[OpenerGUID]))
|--Stream Aggregate(DEFINE:([Expr1006]=SUM(If (((([Currencies].[CurrencyType]='ctMiscellaneous' OR [Currencies].[CurrencyType]='ctTokens') OR [Currencies].[CurrencyType]='ctChips') OR [Currencies].[CurrencyType]='ctCanadianCoin') OR [
|--Nested Loops(Inner Join, OUTER REFERENCES:([OpenerDetails].[CurrencyGUID]) WITH PREFETCH)
|--Nested Loops(Inner Join)
| |--Index Seek(OBJECT:([GrobManagementSystemLive].[dbo].[Openers].[IX_Openers_OneOpenerPerSession]), SEEK:([Openers].[OpenerGUID]=[Openers].[OpenerGUID]) ORDERED FORWARD)
| |--Clustered Index Seek(OBJECT:([GrobManagementSystemLive].[dbo].[OpenerDetails].[IX_OpenerDetails_OpenerGUIDCurrencyGUID]), SEEK:([OpenerDetails].[OpenerGUID]=[Openers].[OpenerGUID]) ORDERED FORWARD)
|--Index Seek(OBJECT:([GrobManagementSystemLive].[dbo].[Currencies].[PK_Currencies_CurrencyGUID]), SEEK:([Currencies].[CurrencyGUID]=[OpenerDetails].[CurrencyGUID]) ORDERED FORWARD)
的壞計劃
|--Sort(ORDER BY:([Expr1020] ASC, [Currencies].[Rank] ASC))
|--Compute Scalar(DEFINE:([Expr1020]=If ([Currencies].[CurrencyType]='ctCanadianCash') then 1 else If ([Currencies].[CurrencyType]='ctMiscellaneous') then 2 else If ([Currencies].[CurrencyType]='ctTokens') then 3 else If ([Currencies].[Currency
|--Nested Loops(Left Outer Join, OUTER REFERENCES:([Openers].[OpenerGUID]))
|--Filter(WHERE:((([Currencies].[IsActive]<>0 AND [Currencies].[OnOpener]<>0) AND ((((((([Currencies].[CurrencyType]='ctUSCoin' OR [Currencies].[CurrencyType]='ctMiscellaneousUS') OR [Currencies].[CurrencyType]='ctUSCash') OR [Currenc
| |--Nested Loops(Left Outer Join, OUTER REFERENCES:([Currencies].[CurrencyGUID], [Openers].[OpenerGUID]) WITH PREFETCH)
| |--Filter(WHERE:([Openers].[SessionGUID]=[@SessionGUID]))
| | |--Concatenation
| | |--Nested Loops(Left Outer Join)
| | | |--Table Spool
| | | | |--Hash Match(Inner Join, HASH:([Windows].[WindowGUID])=([Openers].[WindowGUID]), RESIDUAL:([Windows].[WindowGUID]=[Openers].[WindowGUID]))
| | | | |--Clustered Index Scan(OBJECT:([GrobManagementSystemLive].[dbo].[Windows].[IX_Windows_CageGUID]))
| | | | |--Table Scan(OBJECT:([GrobManagementSystemLive].[dbo].[Openers]))
| | | |--Table Spool
| | | |--Clustered Index Scan(OBJECT:([GrobManagementSystemLive].[dbo].[Currencies].[IX_Currencies_CurrencyType]))
| | |--Compute Scalar(DEFINE:([Openers].[OpenerGUID]=NULL, [Openers].[SessionGUID]=NULL, [Windows].[UseChipDenominations]=NULL))
| | |--Nested Loops(Left Anti Semi Join)
| | |--Clustered Index Scan(OBJECT:([GrobManagementSystemLive].[dbo].[Currencies].[IX_Currencies_CurrencyType]))
| | |--Row Count Spool
| | |--Table Spool
| |--Clustered Index Seek(OBJECT:([GrobManagementSystemLive].[dbo].[OpenerDetails].[IX_OpenerDetails_OpenerGUIDCurrencyGUID]), SEEK:([OpenerDetails].[OpenerGUID]=[Openers].[OpenerGUID] AND [OpenerDetails].[CurrencyGUID]=[Cu
|--Hash Match(Cache, HASH:([Openers].[OpenerGUID]), RESIDUAL:([Openers].[OpenerGUID]=[Openers].[OpenerGUID]))
|--Stream Aggregate(DEFINE:([Expr1006]=SUM([partialagg1034]), [Expr1007]=SUM([partialagg1035]), [Expr1008]=SUM([partialagg1036]), [Expr1009]=SUM([partialagg1037]), [Expr1010]=SUM([partialagg1038]), [Expr1011]=SUM([partialagg1039]
|--Nested Loops(Inner Join)
|--Stream Aggregate(DEFINE:([partialagg1034]=SUM(If (((([Currencies].[CurrencyType]='ctMiscellaneous' OR [Currencies].[CurrencyType]='ctTokens') OR [Currencies].[CurrencyType]='ctChips') OR [Currencies].[CurrencyType]='
| |--Nested Loops(Inner Join, OUTER REFERENCES:([OpenerDetails].[CurrencyGUID]) WITH PREFETCH)
| |--Clustered Index Seek(OBJECT:([GrobManagementSystemLive].[dbo].[OpenerDetails].[IX_OpenerDetails_OpenerGUIDCurrencyGUID]), SEEK:([OpenerDetails].[OpenerGUID]=[Openers].[OpenerGUID]) ORDERED FORWARD)
| |--Index Seek(OBJECT:([GrobManagementSystemLive].[dbo].[Currencies].[PK_Currencies_CurrencyGUID]), SEEK:([Currencies].[CurrencyGUID]=[OpenerDetails].[CurrencyGUID]) ORDERED FORWARD)
|--Index Seek(OBJECT:([GrobManagementSystemLive].[dbo].[Openers].[IX_Openers_OneOpenerPerSession]), SEEK:([Openers].[OpenerGUID]=[Openers].[OpenerGUID]) ORDERED FORWARD)
壞,一個是急於後臺處理600萬行;另一個不是。
注意:這不是關於調整查詢的問題。我有一個快速運行的查詢。我只想讓SQL Server從存儲過程中快速運行。
我仍然不明白如何轉換ANSI_NULLS ON使得性能有如此巨大的差異。 – 2013-07-16 16:42:18
@ Ek0nomik因爲'ANSI_NULLS OFF'時視圖內部的JOIN子句具有不同的含義。突然行匹配,導致優化器完全不同地運行查詢。想象一下,不是排除所有行中的99.9%,而是突然返回。 – 2013-07-16 23:00:51