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从生产站点上的 ASP.NET 前端环境调用此存储过程时，我遇到了中间超时。它返回以下 sql 异常：

异常详细信息：System.Data.SqlClient.SqlException：超时已过期。在操作完成之前超时时间已过或服务器没有响应。

有趣的是，在服务器上或使用 Management Studio 从远程 pc 执行此过程时，它会在 6 秒内执行。但是，有时从 ASP.NET 应用程序执行时会超时？这个查询可以改进吗？还是这个问题与其他问题有关？有谁能帮忙吗？我已经阅读了一些关于增加超时和在我的 web.config 中的连接字符串上启用池的线程，但还没有尝试过。

 ALTER PROCEDURE [dbo].[Report_Activity]
    (
        @StartDate      DATETIME
    ,   @EndDate        DATETIME
    ,   @TotalActions INT OUTPUT
    )

    AS
    BEGIN 

        SELECT      @TotalActions = COUNT(EventHistoryId)
        FROM        dbo.SessionEventHistory
        WHERE       DateCreated BETWEEN @StartDate AND @EndDate

        SELECT      EventDescription, COUNT(EventHistoryId) AS EventCount           
        FROM        dbo.SessionEventHistory
        WHERE       DateCreated BETWEEN @StartDate AND @EndDate
        GROUP BY    EventDescription
        ORDER BY    EventDescription

SQL 模式：

CREATE TABLE [dbo].[SessionEventHistory](
    [EventHistoryID] [int] IDENTITY(1,1) NOT NULL,
    [SessionHistoryID] [int] NOT NULL,
    [CategoryID] [int] NULL,
    [UserName] [nvarchar](50) NULL,
    [IPAddress] [nvarchar](20) NOT NULL,
    [EventDescription] [nvarchar](1000) NOT NULL,
    [EventData] [varbinary](max) NULL,
    [DateCreated] [datetime] NOT NULL,
 CONSTRAINT [PK_UserEventHistory] PRIMARY KEY CLUSTERED 
(
    [EventHistoryID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

ALTER TABLE [dbo].[SessionEventHistory] ADD  CONSTRAINT [DF_UserEventHistory_DateCreated]  DEFAULT (getdate()) FOR [DateCreated]
GO

表有 3 个索引：

/****** Object:  Index [IX_SessionEventHistory_SessionHistoryId_CategoryId]    Script Date: 07/04/2012 10:47:06 ******/
CREATE NONCLUSTERED INDEX [IX_SessionEventHistory_SessionHistoryId_CategoryId] ON [dbo].[SessionEventHistory] 
(
    [SessionHistoryID] ASC,
    [CategoryID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
GO


/****** Object:  Index [IX_SessionEventHistory_UserName_DateCreated]    Script Date: 07/04/2012 10:47:09 ******/
CREATE NONCLUSTERED INDEX [IX_SessionEventHistory_UserName_DateCreated] ON [dbo].[SessionEventHistory] 
(
    [UserName] ASC,
    [DateCreated] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
GO


/****** Object:  Index [PK_UserEventHistory]    Script Date: 07/04/2012 10:47:14 ******/
ALTER TABLE [dbo].[SessionEventHistory] ADD  CONSTRAINT [PK_UserEventHistory] PRIMARY KEY CLUSTERED 
(
    [EventHistoryID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
GO

编辑

我添加了以下索引，看起来还可以吗？

CREATE NONCLUSTERED INDEX [IX_SessionEventHistory_DateCreated] ON [dbo].[SessionEventHistory] 
(
    [DateCreated] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
GO

在此处输入图像描述

4

2 回答 2

4

看看sys.dm_exec_sessions您的 ASP.Net 应用程序和您的 SSMS 会话。我会冒险猜测您的设置中至少有一个SET是不同的。这可能会促成不同的计划（最终这归因于参数嗅探），并且应用程序端通常会因此而变得更糟。

有关更多详细信息，请参阅这些其他问题：

从 Web 调用存储过程时速度慢，从 Management Studio 调用时速度快

过程在 ADO.NET 中超时，但在 SSMS 中没有

从 Web 执行时查询超时，但从 SSMS 执行时超快

ADO .NET 与 SQL Server Management Studio - ADO 性能更差

另请阅读Erland Sommarskog 的这篇精彩文章。

于 2012-07-04T01:07:58.743 回答
0

也许这是用一些非典型的 SP 调用创建的糟糕的执行计划。尝试WITH RECOMPILE在执行 SP 时或在定义中使用。

EXEC [dbo].[Report_Activity] @StartDate, @EndDate, @TotalActions WITH RECOMPILE

或者

ALTER PROCEDURE [dbo].[Report_Activity]
    (
        @StartDate      DATETIME
    ,   @EndDate        DATETIME
    ,   @TotalActions INT OUTPUT
    )
WITH RECOMPILE
AS
...

您还可以运行sp_recompile以标记您的 SP 以便在下次执行时重新编译。

于 2012-07-04T01:31:37.723 回答