如何解决事务块会降低SQL Server的性能吗？
| 现在，我和一个同事正在争论非重要的BEGIN TRAN ... COMMIT TRAN块的影响。 我已经为简单的插入-更新-删除操作编写了约140个存储过程，由于以后我们可能需要在其中进行一些额外的操作，因此我已经包括了可能必要的BEGIN TRAN和COMMIT TRAN块，所以：CREATE PROCEDURE [Users].[Login_Insert]
@Username nvarchar (50) OUTPUT,@Password char (40),@FullName nvarchar (150),@LoginTypeId int
AS
SET NOCOUNT ON;
BEGIN TRY
BEGIN TRAN
INSERT [Users].[Login]
(
[Username],[Password],[FullName],[LoginTypeId]
)
VALUES
(
@Username,@Password,@FullName,@LoginTypeId
)
COMMIT TRAN
RETURN 1
END TRY
BEGIN CATCH
ROLLBACK TRAN
RETURN -1
END CATCH
GO
解决方法
还不足以引起注意。
也就是说，每个TXN将在BEGIN TRAN和INSERT之间打开一个额外的OhNoSecond。如果有人可以衡量我，我会印象深刻。
但是，如果您进行了BEGIN TRAN，然后提示用户输入，则您的腿需要折断...
不过好主意：我这样做是为了使我所有的写过程都是100％一致的，具有相同的错误处理，可以嵌套等
编辑：在Remus回答之后，我看到我没有链接到我的嵌套TXN模板：包含TRY CATCH ROLLBACK模式的嵌套存储过程？这与Remus \'的不同之处在于，它总是回滚并且没有SAVEPOINTs
编辑，一个快速而肮脏的测试显示它在进行交易时的速度大约是2/3
SET NOCOUNT ON
SET STATISTICS IO OFF
DECLARE @date DATETIME2
DECLARE @noTran INT
DECLARE @withTran INT
SET @noTran = 0
SET @withTran = 0
DECLARE @t TABLE (ColA INT)
INSERT @t VALUES (1)
DECLARE
@count INT,@value INT
SET @count = 1
WHILE @count < 100
BEGIN
SET @date = GETDATE()
UPDATE smalltable SET smalltablename = CASE smalltablename WHEN \'test1\' THEN \'test\' ELSE \'test2\' END WHERE smalltableid = 1
SET @noTran = @noTran + DATEDIFF(MICROSECOND,@date,GETDATE())
SET @date = GETDATE()
BEGIN TRAN
UPDATE smalltable SET smalltablename = CASE smalltablename WHEN \'test1\' THEN \'test\' ELSE \'test2\' END WHERE smalltableid = 1
COMMIT TRAN
SET @withTran = @withTran + DATEDIFF(MICROSECOND,GETDATE())
SET @count = @count + 1
END
SELECT
@noTran / 1000000. AS Seconds_NoTransaction,@withTran / 1000000. AS Seconds_WithTransaction
Seconds_NoTransaction Seconds_WithTransaction
2.63200000 2.70400000
2.16700000 2.12300000
XACT_STATE
CREATE PROC GET_PAYMENT_SUMS_BY_CLIENT
AS
--Required for reporting in a specific Business Intelligence later; Optional
SET FMTONLY OFF;
BEGIN TRANSACTION
--Query 1
--This CTE checks over 30 million records
WITH CTE1 AS(
SELECT CASE VARIABLE
--170 case conditions go here
END AS TheType,Amount,PK1 FROM TABLE1),--THIS CTE Pivots the sums to get the data in the style I want it in
CTE2 AS(
SELECT PK1,[PIVOT1],[PIVOT2],[PIVOT3]
FROM
(SELECT * FROM CTE1) AS BaseTable --Alias was just to get it to execute
)
PIVOT(
SUM(Amount)
FOR TheType IN ([PIVOT1],[PIVOT3])
) AS PivotTable
)
)
SELECT TABLE2.NAME,CTE2.* INTO #TEMPORARY_TABLE
FROM CTE2
JOIN TABLE2 ON CTE2.PK1 = TABLE2.PK2
--Query 2
--Written to force the function to look at 355 records instead of 33 million
SELECT *,dbo.SCALAR_VALUED_FUNCTION(PK2) FROM #TEMPORARY_TABLE
COMMIT TRANSACTION
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