C# 为什么数据库访问时间会改变？

对于我的一个应用程序，我正在运行SQLServer2005，并且在localhost上运行它。当我通过应用程序访问它时，如果我在本地主机上访问它，则需要1-10秒才能开始显示数据。但是，当我离开localhost并从网络上的另一台计算机访问它时，访问时间大约为1秒

为什么会出现这种情况？我如何纠正这种情况，以便在本地主机上拥有相同的访问时间

连接字符串：

数据源=THESTUDIO\SQLEXPRESS；初始目录=RentalEase；集成安全=真

使用类型化数据集进行查询（大部分）

加载表单时，我发现VisualStudio多次使用同一查询查询数据库。尽管据我所知，数据库会以缓存的查询版本进行响应。但是，我确实发现应用程序（来自winform的数据绑定功能）正在执行此查询：

exec sp_executesql N'UPDATE [tblTenant] SET [TenantStatusID] = @TenantStatusID, [PropertyID] = @PropertyID, [UnitID] = @UnitID, [TenantName] = @TenantName, [Sex] = @Sex, [BirthDate] = @BirthDate, [SSNO] = @SSNO, [CoTenant1] = @CoTenant1, [CoTenant1Sex] = @CoTenant1Sex, [CoTenant1BirthDate] = @CoTenant1BirthDate, [CoTenant1SSNO] = @CoTenant1SSNO, [CoTenant2] = @CoTenant2, [CoTenant2Sex] = @CoTenant2Sex, [CoTenant2BirthDate] = @CoTenant2BirthDate, [CoTenant2SSNO] = @CoTenant2SSNO, [CoTenant3] = @CoTenant3, [CoTenant3Sex] = @CoTenant3Sex, [CoTenant3BirthDate] = @CoTenant3BirthDate, [CoTenant3SSNO] = @CoTenant3SSNO, [CarColor] = @CarColor, [CarModel] = @CarModel, [CarYear] = @CarYear, [CarState] = @CarState, [CarPlateNumber] = @CarPlateNumber, [Memo] = @Memo, [Address1] = @Address1, [Address2] = @Address2, [Address3] = @Address3, [Address4] = @Address4, [Phone] = @Phone, [ReferBy] = @ReferBy, [BeginDate] = @BeginDate, [NoticeGiven] = @NoticeGiven, [LeaseMonth2Month] = @LeaseMonth2Month, [LeaseEnds] = @LeaseEnds, [DepositPaid] = @DepositPaid, [DepositRefundable] = @DepositRefundable, [RefundMemo] = @RefundMemo, [RentDueDay] = @RentDueDay, [Charge1] = @Charge1, [Charge1Amount] = @Charge1Amount, [Charge2] = @Charge2, [Charge2Amount] = @Charge2Amount, [Charge3] = @Charge3, [Charge3Amount] = @Charge3Amount, [Charge4] = @Charge4, [Charge4Amount] = @Charge4Amount WHERE (([ID] = @Original_ID) AND ([TenantStatusID] = @Original_TenantStatusID) AND ((@IsNull_PropertyID = 1 AND [PropertyID] IS NULL) OR ([PropertyID] = @Original_PropertyID)) AND ((@IsNull_UnitID = 1 AND [UnitID] IS NULL) OR ([UnitID] = @Original_UnitID)) AND ((@IsNull_TenantName = 1 AND [TenantName] IS NULL) OR ([TenantName] = @Original_TenantName)) AND ((@IsNull_Sex = 1 AND [Sex] IS NULL) OR ([Sex] = @Original_Sex)) AND ((@IsNull_BirthDate = 1 AND [BirthDate] IS NULL) OR ([BirthDate] = @Original_BirthDate)) AND ((@IsNull_SSNO = 1 AND [SSNO] IS NULL) OR ([SSNO] = @Original_SSNO)) AND ((@IsNull_CoTenant1 = 1 AND [CoTenant1] IS NULL) OR ([CoTenant1] = @Original_CoTenant1)) AND ((@IsNull_CoTenant1Sex = 1 AND [CoTenant1Sex] IS NULL) OR ([CoTenant1Sex] = @Original_CoTenant1Sex)) AND ((@IsNull_CoTenant1BirthDate = 1 AND [CoTenant1BirthDate] IS NULL) OR ([CoTenant1BirthDate] = @Original_CoTenant1BirthDate)) AND ((@IsNull_CoTenant1SSNO = 1 AND [CoTenant1SSNO] IS NULL) OR ([CoTenant1SSNO] = @Original_CoTenant1SSNO)) AND ((@IsNull_CoTenant2 = 1 AND [CoTenant2] IS NULL) OR ([CoTenant2] = @Original_CoTenant2)) AND ((@IsNull_CoTenant2Sex = 1 AND [CoTenant2Sex] IS NULL) OR ([CoTenant2Sex] = @Original_CoTenant2Sex)) AND ((@IsNull_CoTenant2BirthDate = 1 AND [CoTenant2BirthDate] IS NULL) OR ([CoTenant2BirthDate] = @Original_CoTenant2BirthDate)) AND ((@IsNull_CoTenant2SSNO = 1 AND [CoTenant2SSNO] IS NULL) OR ([CoTenant2SSNO] = @Original_CoTenant2SSNO)) AND ((@IsNull_CoTenant3 = 1 AND [CoTenant3] IS NULL) OR ([CoTenant3] = @Original_CoTenant3)) AND ((@IsNull_CoTenant3Sex = 1 AND [CoTenant3Sex] IS NULL) OR ([CoTenant3Sex] = @Original_CoTenant3Sex)) AND ((@IsNull_CoTenant3BirthDate = 1 AND [CoTenant3BirthDate] IS NULL) OR ([CoTenant3BirthDate] = @Original_CoTenant3BirthDate)) AND ((@IsNull_CoTenant3SSNO = 1 AND [CoTenant3SSNO] IS NULL) OR ([CoTenant3SSNO] = @Original_CoTenant3SSNO)) AND ((@IsNull_CarColor = 1 AND [CarColor] IS NULL) OR ([CarColor] = @Original_CarColor)) AND ((@IsNull_CarModel = 1 AND [CarModel] IS NULL) OR ([CarModel] = @Original_CarModel)) AND ((@IsNull_CarYear = 1 AND [CarYear] IS NULL) OR ([CarYear] = @Original_CarYear)) AND ((@IsNull_CarState = 1 AND [CarState] IS NULL) OR ([CarState] = @Original_CarState)) AND ((@IsNull_CarPlateNumber = 1 AND [CarPlateNumber] IS NULL) OR ([CarPlateNumber] = @Original_CarPlateNumber)) AND ((@IsNull_Address1 = 1 AND [Address1] IS NULL) OR ([Address1] = @Original_Address1)) AND ((@IsNull_Address2 = 1 AND [Address2] IS NULL) OR ([Address2] = @Original_Address2)) AND ((@IsNull_Address3 = 1 AND [Address3] IS NULL) OR ([Address3] = @Original_Address3)) AND ((@IsNull_Address4 = 1 AND [Address4] IS NULL) OR ([Address4] = @Original_Address4)) AND ((@IsNull_Phone = 1 AND [Phone] IS NULL) OR ([Phone] = @Original_Phone)) AND ((@IsNull_ReferBy = 1 AND [ReferBy] IS NULL) OR ([ReferBy] = @Original_ReferBy)) AND ((@IsNull_BeginDate = 1 AND [BeginDate] IS NULL) OR ([BeginDate] = @Original_BeginDate)) AND ((@IsNull_NoticeGiven = 1 AND [NoticeGiven] IS NULL) OR ([NoticeGiven] = @Original_NoticeGiven)) AND ((@IsNull_LeaseMonth2Month = 1 AND [LeaseMonth2Month] IS NULL) OR ([LeaseMonth2Month] = @Original_LeaseMonth2Month)) AND ((@IsNull_LeaseEnds = 1 AND [LeaseEnds] IS NULL) OR ([LeaseEnds] = @Original_LeaseEnds)) AND ((@IsNull_DepositPaid = 1 AND [DepositPaid] IS NULL) OR ([DepositPaid] = @Original_DepositPaid)) AND ((@IsNull_DepositRefundable = 1 AND [DepositRefundable] IS NULL) OR ([DepositRefundable] = @Original_DepositRefundable)) AND ((@IsNull_RentDueDay = 1 AND [RentDueDay] IS NULL) OR ([RentDueDay] = @Original_RentDueDay)) AND ((@IsNull_Charge1 = 1 AND [Charge1] IS NULL) OR ([Charge1] = @Original_Charge1)) AND ((@IsNull_Charge1Amount = 1 AND [Charge1Amount] IS NULL) OR ([Charge1Amount] = @Original_Charge1Amount)) AND ((@IsNull_Charge2 = 1 AND [Charge2] IS NULL) OR ([Charge2] = @Original_Charge2)) AND ((@IsNull_Charge2Amount = 1 AND [Charge2Amount] IS NULL) OR ([Charge2Amount] = @Original_Charge2Amount)) AND ((@IsNull_Charge3 = 1 AND [Charge3] IS NULL) OR ([Charge3] = @Original_Charge3)) AND ((@IsNull_Charge3Amount = 1 AND [Charge3Amount] IS NULL) OR ([Charge3Amount] = @Original_Charge3Amount)) AND ((@IsNull_Charge4 = 1 AND [Charge4] IS NULL) OR ([Charge4] = @Original_Charge4)) AND ((@IsNull_Charge4Amount = 1 AND [Charge4Amount] IS NULL) OR ([Charge4Amount] = @Original_Charge4Amount)));
SELECT ID, TenantStatusID, PropertyID, UnitID, TenantName, Sex, BirthDate, SSNO, CoTenant1, CoTenant1Sex, CoTenant1BirthDate, CoTenant1SSNO, CoTenant2, CoTenant2Sex, CoTenant2BirthDate, CoTenant2SSNO, CoTenant3, CoTenant3Sex, CoTenant3BirthDate, CoTenant3SSNO, CarColor, CarModel, CarYear, CarState, CarPlateNumber, Memo, Address1, Address2, Address3, Address4, Phone, ReferBy, BeginDate, NoticeGiven, LeaseMonth2Month, LeaseEnds, DepositPaid, DepositRefundable, RefundMemo, RentDueDay, Charge1, Charge1Amount, Charge2, Charge2Amount, Charge3, Charge3Amount, Charge4, Charge4Amount FROM tblTenant WHERE (ID = @ID)',N'@TenantStatusID int,@PropertyID int,@UnitID int,@TenantName nvarchar(4),@Sex nvarchar(1),@BirthDate datetime,@SSNO nvarchar(9),@CoTenant1 nvarchar(4000),@CoTenant1Sex nvarchar(4000),@CoTenant1BirthDate datetime,@CoTenant1SSNO nvarchar(4000),@CoTenant2 nvarchar(4000),@CoTenant2Sex nvarchar(4000),@CoTenant2BirthDate datetime,@CoTenant2SSNO nvarchar(4000),@CoTenant3 nvarchar(2),@CoTenant3Sex nvarchar(4000),@CoTenant3BirthDate datetime,@CoTenant3SSNO nvarchar(4000),@CarColor nvarchar(4000),@CarModel nvarchar(4000),@CarYear nvarchar(4000),@CarState nvarchar(4000),@CarPlateNumber nvarchar(7),@Memo nvarchar(4000),@Address1 nvarchar(10),@Address2 nvarchar(10),@Address3 nvarchar(10),@Address4 nvarchar(10),@Phone nvarchar(4000),@ReferBy nvarchar(9),@BeginDate datetime,@NoticeGiven datetime,@LeaseMonth2Month bit,@LeaseEnds datetime,@DepositPaid money,@DepositRefundable money,@RefundMemo nvarchar(4000),@RentDueDay nvarchar(4000),@Charge1 int,@Charge1Amount money,@Charge2 int,@Charge2Amount money,@Charge3 int,@Charge3Amount money,@Charge4 int,@Charge4Amount money,@Original_ID int,@Original_TenantStatusID int,@IsNull_PropertyID int,@Original_PropertyID int,@IsNull_UnitID int,@Original_UnitID int,@IsNull_TenantName int,@Original_TenantName nvarchar(4),@IsNull_Sex int,@Original_Sex nvarchar(1),@IsNull_BirthDate int,@Original_BirthDate datetime,@IsNull_SSNO int,@Original_SSNO nvarchar(9),@IsNull_CoTenant1 int,@Original_CoTenant1 nvarchar(4000),@IsNull_CoTenant1Sex int,@Original_CoTenant1Sex nvarchar(4000),@IsNull_CoTenant1BirthDate int,@Original_CoTenant1BirthDate datetime,@IsNull_CoTenant1SSNO int,@Original_CoTenant1SSNO nvarchar(4000),@IsNull_CoTenant2 int,@Original_CoTenant2 nvarchar(4000),@IsNull_CoTenant2Sex int,@Original_CoTenant2Sex nvarchar(4000),@IsNull_CoTenant2BirthDate int,@Original_CoTenant2BirthDate datetime,@IsNull_CoTenant2SSNO int,@Original_CoTenant2SSNO nvarchar(4000),@IsNull_CoTenant3 int,@Original_CoTenant3 nvarchar(2),@IsNull_CoTenant3Sex int,@Original_CoTenant3Sex nvarchar(4000),@IsNull_CoTenant3BirthDate int,@Original_CoTenant3BirthDate datetime,@IsNull_CoTenant3SSNO int,@Original_CoTenant3SSNO nvarchar(4000),@IsNull_CarColor int,@Original_CarColor nvarchar(4000),@IsNull_CarModel int,@Original_CarModel nvarchar(4000),@IsNull_CarYear int,@Original_CarYear nvarchar(4000),@IsNull_CarState int,@Original_CarState nvarchar(4000),@IsNull_CarPlateNumber int,@Original_CarPlateNumber nvarchar(7),@IsNull_Address1 int,@Original_Address1 nvarchar(10),@IsNull_Address2 int,@Original_Address2 nvarchar(10),@IsNull_Address3 int,@Original_Address3 nvarchar(10),@IsNull_Address4 int,@Original_Address4 nvarchar(10),@IsNull_Phone int,@Original_Phone nvarchar(4000),@IsNull_ReferBy int,@Original_ReferBy nvarchar(9),@IsNull_BeginDate int,@Original_BeginDate datetime,@IsNull_NoticeGiven int,@Original_NoticeGiven datetime,@IsNull_LeaseMonth2Month int,@Original_LeaseMonth2Month bit,@IsNull_LeaseEnds int,@Original_LeaseEnds datetime,@IsNull_DepositPaid int,@Original_DepositPaid money,@IsNull_DepositRefundable int,@Original_DepositRefundable money,@IsNull_RentDueDay int,@Original_RentDueDay nvarchar(4000),@IsNull_Charge1 int,@Original_Charge1 int,@IsNull_Charge1Amount int,@Original_Charge1Amount money,@IsNull_Charge2 int,@Original_Charge2 int,@IsNull_Charge2Amount int,@Original_Charge2Amount money,@IsNull_Charge3 int,@Original_Charge3 int,@IsNull_Charge3Amount int,@Original_Charge3Amount money,@IsNull_Charge4 int,@Original_Charge4 int,@IsNull_Charge4Amount int,@Original_Charge4Amount money,@ID int',@TenantStatusID=1,@PropertyID=111,@UnitID=2175,@TenantName=N'Judy',@Sex=N'1',@BirthDate='Apr 29 1980  3:26:06:000PM',@SSNO=N'333333333',@CoTenant1=NULL,@CoTenant1Sex=NULL,@CoTenant1BirthDate=NULL,@CoTenant1SSNO=NULL,@CoTenant2=NULL,@CoTenant2Sex=NULL,@CoTenant2BirthDate=NULL,@CoTenant2SSNO=NULL,@CoTenant3=N'51',@CoTenant3Sex=NULL,@CoTenant3BirthDate=NULL,@CoTenant3SSNO=NULL,@CarColor=NULL,@CarModel=NULL,@CarYear=NULL,@CarState=NULL,@CarPlateNumber=N'001122B',@Memo=NULL,@Address1=N'blah line1',@Address2=N'blah line2',@Address3=N'blah line3',@Address4=N'blah line4',@Phone=NULL,@ReferBy=N'McDonalds',@BeginDate='May  6 2009  4:54:28:000PM',@NoticeGiven='May  6 2009 11:58:45:000AM',@LeaseMonth2Month=1,@LeaseEnds='May 21 2009 10:06:25:000AM',@DepositPaid=50.0000,@DepositRefundable=0.0000,@RefundMemo=NULL,@RentDueDay=NULL,@Charge1=6,@Charge1Amount=50.0000,@Charge2=49,@Charge2Amount=50.0000,@Charge3=45,@Charge3Amount=5.0000,@Charge4=47,@Charge4Amount=7.0000,@Original_ID=10,@Original_TenantStatusID=1,@IsNull_PropertyID=0,@Original_PropertyID=111,@IsNull_UnitID=0,@Original_UnitID=2175,@IsNull_TenantName=0,@Original_TenantName=N'Judy',@IsNull_Sex=0,@Original_Sex=N'1',@IsNull_BirthDate=0,@Original_BirthDate='Apr 29 1980  3:26:06:000PM',@IsNull_SSNO=0,@Original_SSNO=N'333333333',@IsNull_CoTenant1=1,@Original_CoTenant1=NULL,@IsNull_CoTenant1Sex=1,@Original_CoTenant1Sex=NULL,@IsNull_CoTenant1BirthDate=1,@Original_CoTenant1BirthDate=NULL,@IsNull_CoTenant1SSNO=1,@Original_CoTenant1SSNO=NULL,@IsNull_CoTenant2=1,@Original_CoTenant2=NULL,@IsNull_CoTenant2Sex=1,@Original_CoTenant2Sex=NULL,@IsNull_CoTenant2BirthDate=1,@Original_CoTenant2BirthDate=NULL,@IsNull_CoTenant2SSNO=1,@Original_CoTenant2SSNO=NULL,@IsNull_CoTenant3=0,@Original_CoTenant3=N'51',@IsNull_CoTenant3Sex=1,@Original_CoTenant3Sex=NULL,@IsNull_CoTenant3BirthDate=1,@Original_CoTenant3BirthDate=NULL,@IsNull_CoTenant3SSNO=1,@Original_CoTenant3SSNO=NULL,@IsNull_CarColor=1,@Original_CarColor=NULL,@IsNull_CarModel=1,@Original_CarModel=NULL,@IsNull_CarYear=1,@Original_CarYear=NULL,@IsNull_CarState=1,@Original_CarState=NULL,@IsNull_CarPlateNumber=0,@Original_CarPlateNumber=N'001122B',@IsNull_Address1=0,@Original_Address1=N'blah line1',@IsNull_Address2=0,@Original_Address2=N'blah line2',@IsNull_Address3=0,@Original_Address3=N'blah line3',@IsNull_Address4=0,@Original_Address4=N'blah line4',@IsNull_Phone=1,@Original_Phone=NULL,@IsNull_ReferBy=0,@Original_ReferBy=N'McDonalds',@IsNull_BeginDate=0,@Original_BeginDate='May  6 2009  4:54:28:000PM',@IsNull_NoticeGiven=0,@Original_NoticeGiven='May  6 2009 11:58:45:000AM',@IsNull_LeaseMonth2Month=0,@Original_LeaseMonth2Month=1,@IsNull_LeaseEnds=0,@Original_LeaseEnds='May 21 2009 10:06:25:000AM',@IsNull_DepositPaid=0,@Original_DepositPaid=50.0000,@IsNull_DepositRefundable=0,@Original_DepositRefundable=0.0000,@IsNull_RentDueDay=1,@Original_RentDueDay=NULL,@IsNull_Charge1=0,@Original_Charge1=6,@IsNull_Charge1Amount=0,@Original_Charge1Amount=50.0000,@IsNull_Charge2=0,@Original_Charge2=49,@IsNull_Charge2Amount=0,@Original_Charge2Amount=50.0000,@IsNull_Charge3=0,@Original_Charge3=45,@IsNull_Charge3Amount=0,@Original_Charge3Amount=5.0000,@IsNull_Charge4=0,@Original_Charge4=47,@IsNull_Charge4Amount=0,@Original_Charge4Amount=7.0000,@ID=10

目前，完成这项工作大约需要整整一秒钟的时间。对此我能做些什么？

您可以连接到服务器，查看到底发生了什么，以及Sql语句是否完全相同

如果它们是，并且仍然存在差异，那么可能其中一个应用程序正在使用不同的执行计划。使用以下方法清除缓存：

DBCC FREEPROCCACHE

并检查它是否有区别

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这方面还有很多其他建议。

您的本地计算机还做了什么？你好吗？如果延迟发生在数据库中，我会感到惊讶，除非其他加载的应用程序导致了交换。

我猜10秒是本地计算机上（不经常使用）数据库启动所需的时间。我实际上还没有尝试修复这个问题，但我的第一个猜测是尝试禁用该数据库的“自动关闭”属性

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有关“自动关闭”属性的进一步说明，请参阅。

这可能与SQL Server试图在本地计算机上使用的特定通信协议有关

你需要发帖 -您的连接字符串

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-服务器计算机上启用的协议（从SQL server configuration manager）。

本地计算机和远程计算机可能具有不同的客户端网络协议设置。本地机器配置为先尝试共享内存，然后是网络管道，然后是tcp，但服务器配置为不侦听共享内存（不常见，但可能）。远程机器被配置为直接尝试tcp，因此它们从第一次尝试就获得了大奖。只是在黑暗中拍摄，没有更多可用信息

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您应该首先分析问题并确定10秒延迟发生在何处：在打开连接时、在运行查询时、在将结果返回到客户端时等等。

我如何将SQL探查器附加到C#winforms应用程序？您将其附加到数据库，而不是应用程序：）相关帖子实际上不相关，我正在执行相同的查询，只是来自不同的机器。另一篇文章正在执行相同的查询，但是来自不同的环境。我认为很多事情都是有道理的，但取决于您：）我正在运行SQL Express 2005，我认为我无法访问profiler.question更新。我在使用dev机器的同时，我的同事正在连接到它的数据库，他的查询执行速度比我在dev机器上执行时快得多。数据库一直在运行。此问题也会影响远程连接。请尝试在本地计算机上更改该选项：可能您的SQL server服务正在运行，但并不总是加载该数据库实例。您可以通过启动SQL Management Studio，右键单击数据库，选择属性，然后选择选项。即使这是造成问题的原因，远程连接也会受到相同延迟的影响，所以我严重怀疑这是否是原因。不过我还是要试试。共享内存、命名管道和tcp/ip已启用，只有VIA已禁用。