SQL Server更新触发器性能不佳

Question

我正在使用SSIS使用SQL Server 2008 R2更新表中的13000行，该表上有一个更新触发器，没有更新所需的触发器＆lt; 5分钟，触发它＆gt; 1小时。

我原本预计它会在触发器上花费两倍的时间（<10分钟）但它会占用更长的时间。任何人都可以给出任何可能导致此问题的指示，或解决问题的方法吗？

表：

CREATE TABLE [Dim].[Company]
(
[CompanyKey] INT NOT NULL IDENTITY , 
[Name] nCHAR(255) NOT NULL, 
[City] nCHAR(100) NOT NULL, 
[Country] nCHAR(100) NOT NULL, 
[PostCode] nCHAR(20) NOT NULL, 
[Continent] nCHAR(100) NOT NULL, 
[EcconomicRegion] nCHAR(50) NOT NULL, 
[ErdfAreaType] nCHAR(10) NOT NULL, 
[PostCodeLong] nCHAR(10) NOT NULL, 
[PostCodeLat] nCHAR(10) NOT NULL, 
[Type] nCHAR(50) NOT NULL, 
[NumEmployees] int NOT NULL, 
[AnnualRevenue] MONEY NOT NULL, 
[BalanceSheetTotal] MONEY NOT NULL, 
[OwnershipType] nCHAR(50) NOT NULL, 
[MembershipType] nCHAR(50) NOT NULL, 
[AccountManagerKey] INT NOT NULL 

CONSTRAINT [PK_Company] PRIMARY KEY CLUSTERED ([CompanyKey] asc)
)
GO
CREATE INDEX [IX_Company_NameCityPostcode] ON [Dim].[Company] ([Name], [City], [PostCode])
GO
CREATE INDEX [IX_Company_Name] ON [Dim].[Company] ([Name])
GO
CREATE INDEX [IX_Company_City] ON [Dim].[Company] ([City])
GO
CREATE INDEX [IX_Company_Postcode] ON [Dim].[Company] ([PostCode])

触发：

CREATE TRIGGER [Dim].[Company_Update] ON [Dim].[Company] FOR UPDATE 
AS BEGIN SET NOCOUNT ON update [dim].[company] set ModifiedOn = GETDATE() END

更新执行计划：不确定它是否可见，但它显示执行1，运算符成本0.040004（92％）

触发更新执行计划：不确定其可见但是它表示执行1，运营商成本22.300197（97％）

解答： 基于Emmad Kareem回答和这个问题 - trigger updates entire table even on single-row update

我将触发器更改为：

CREATE TRIGGER [Dim].[Company_Update] ON [Dim].[Company] FOR UPDATE AS BEGIN 
SET NOCOUNT ON 
update [dim].[company] set ModifiedOn = GETDATE() 
from [Dim].[Company] bf
inner join inserted i on i.CompanyKey = bf.CompanyKey
END
GO

现在更新按预期执行

Answer 1

更新触发器SQL没有WHERE子句来指定要更新的特定行。

Answer 2

你错过了关于触发器的where子句，所以基本上它每次更新表中的每一行。尝试这样的事情：

CREATE TRIGGER [Dim].[Company_Update] 
ON [Dim].[Company] FOR UPDATE 
 AS
 UPDATE [dim].[company]
  SET ModifiedOn = GETDATE()
  WHERE CompanyKey IN (SELECT DISTINCT CompanyKey FROM Inserted)