我已将我的网站托管在rackspace云服务器上。
有时我从数据库中获取记录时会遇到以下异常。奇怪的是，重启后几天一切正常，而且我只在少数几个地方得到这个例外，而不是到处都是。
Exception: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
Stack Trace:
[SqlException (0x80131904): Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +404
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() +412
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +1363
System.Data.SqlClient.SqlDataReader.ConsumeMetaData() +59
System.Data.SqlClient.SqlDataReader.get_MetaData() +118
System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +6387937
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +6389506
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +538
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +28
System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +256
System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +19
System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) +553
[EntityCommandExecutionException: An error occurred while executing the command definition. See the inner exception for details.]
DataAccessLayer.dbCustomer.CompanyCustomerByLocationId(String sortExpression, Boolean asc, String nameSearchString, Int32 startRowIndex, Int32 maximumRows, Int32& TotalRecord, Int64 companyId) in D:\Dotnet Projects\FutureZoom\FutureZoom\DataAccessLayer\dbCustomer.cs:508
BusinessLogic.Customer.CompanyCustomerByLocationId(String sortExpression, Boolean asc, String nameSearchString, Int32 startRowIndex, Int32 maximumRows, Int64 CompanyId) in D:\Dotnet Projects\FutureZoom\FutureZoom\BusinessLogic\Customer.cs:431
FutureZoom.Areas.Admin.Controllers.CompanyController.CustomerPaging(Int32 StartIndex, Int32 PageSize, String SortExp, Boolean Asc, String SearchExp, String Where) in D:\Dotnet Projects\FutureZoom\FutureZoom\FutureZoom\Areas\Admin\Controllers\CompanyController.cs:552
lambda_method(Closure , ControllerBase , Object[] ) +362
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +248
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +39
System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +125
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +640
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +312
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +691
System.Web.Mvc.Controller.ExecuteCore() +162
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +305
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +62
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +20
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +469
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +375
我的Linq查询在下面提到
query = context.Customers.Include("Company").Include("Company.EmailCampaignerStatus")
.OrderBy(m => m.EmailCampaignerStatus.FirstOrDefault().CreatedOn)
.Where(m => m.FirstName.StartsWith(name) || m.LastName.StartsWith(name) || m.Email.StartsWith(name) || (m.FirstName + " " + m.LastName).StartsWith(name))
.Where(m => m.CompanyId == companyId)
.Where(m => m.CompanyLocationId == locationId)
.Skip(startRowIndex == 0 ? startRowIndex : startRowIndex - 1)
.Take(maximumRows)
.ToList();
此查询的执行时间在我的本地计算机上甚至不是1秒，并且在重新启动后在服务器端也是相同的但是执行时间逐日增加并且在几天之后无法执行（有时失败并且有时会给出结果）。
我观察到它耗时31.05秒而失败，它耗时51.09秒而失败。有时它需要超过2分钟并给出结果。
我与rackspace人员谈过，但是他们无法追踪相同的实际原因。
编辑1：我在SQL事件探查器中看到了以下针对我的分页查询的查询
SELECT
[Project3].[Id1] AS [Id],
[Project3].[C1] AS [C1],
[Project3].[Id] AS [Id1],
[Project3].[CompanyId] AS [CompanyId],
[Project3].[CompanyLocationId] AS [CompanyLocationId],
[Project3].[FirstName] AS [FirstName],
[Project3].[LastName] AS [LastName],
[Project3].[Email] AS [Email],
[Project3].[Address1] AS [Address1],
[Project3].[Address2] AS [Address2],
[Project3].[City] AS [City],
[Project3].[State] AS [State],
[Project3].[Country] AS [Country],
[Project3].[Zip] AS [Zip],
[Project3].[Phone] AS [Phone],
[Project3].[SaleDate] AS [SaleDate],
[Project3].[Notes] AS [Notes],
[Project3].[Cost] AS [Cost],
[Project3].[CreatedOn] AS [CreatedOn],
[Project3].[ModifiedOn] AS [ModifiedOn],
[Project3].[PrimaryReviewSiteId] AS [PrimaryReviewSiteId],
[Project3].[Id2] AS [Id2],
[Project3].[SubscriptionTypeId] AS [SubscriptionTypeId],
[Project3].[PlanFeeAmount] AS [PlanFeeAmount],
[Project3].[LoginId] AS [LoginId],
[Project3].[IndustryTypeId] AS [IndustryTypeId],
[Project3].[CompanyName] AS [CompanyName],
[Project3].[NumberOfLocations] AS [NumberOfLocations],
[Project3].[LogoImageName] AS [LogoImageName],
[Project3].[WebsiteUrl] AS [WebsiteUrl],
[Project3].[blsActive] AS [blsActive],
[Project3].[Pending] AS [Pending],
[Project3].[ExpiryDate] AS [ExpiryDate],
[Project3].[C2] AS [C2],
[Project3].[Id3] AS [Id3],
[Project3].[UploadTicketId] AS [UploadTicketId],
[Project3].[UploadStatus] AS [UploadStatus],
[Project3].[CompanyId1] AS [CompanyId1],
[Project3].[CompanyLocationId1] AS [CompanyLocationId1],
[Project3].[CustomerId] AS [CustomerId],
[Project3].[CreatedOn2] AS [CreatedOn1]
FROM ( SELECT
[Limit2].[Id] AS [Id],
[Limit2].[CompanyId] AS [CompanyId],
[Limit2].[CompanyLocationId] AS [CompanyLocationId],
[Limit2].[FirstName] AS [FirstName],
[Limit2].[LastName] AS [LastName],
[Limit2].[Email] AS [Email],
[Limit2].[Address1] AS [Address1],
[Limit2].[Address2] AS [Address2],
[Limit2].[City] AS [City],
[Limit2].[State] AS [State],
[Limit2].[Country] AS [Country],
[Limit2].[Zip] AS [Zip],
[Limit2].[Phone] AS [Phone],
[Limit2].[SaleDate] AS [SaleDate],
[Limit2].[Notes] AS [Notes],
[Limit2].[Cost] AS [Cost],
[Limit2].[CreatedOn] AS [CreatedOn],
[Limit2].[ModifiedOn] AS [ModifiedOn],
[Limit2].[PrimaryReviewSiteId] AS [PrimaryReviewSiteId],
[Limit2].[Id1] AS [Id1],
[Limit2].[CreatedOn1] AS [CreatedOn1],
[Limit2].[Id2] AS [Id2],
[Limit2].[SubscriptionTypeId] AS [SubscriptionTypeId],
[Limit2].[PlanFeeAmount] AS [PlanFeeAmount],
[Limit2].[LoginId] AS [LoginId],
[Limit2].[IndustryTypeId] AS [IndustryTypeId],
[Limit2].[CompanyName] AS [CompanyName],
[Limit2].[NumberOfLocations] AS [NumberOfLocations],
[Limit2].[WebsiteUrl] AS [WebsiteUrl],
[Limit2].[blsActive] AS [blsActive],
[Limit2].[Pending] AS [Pending],
[Limit2].[ExpiryDate] AS [ExpiryDate],
[Limit2].[LogoImageName] AS [LogoImageName],
[Limit2].[C1] AS [C1],
[Extent4].[Id] AS [Id3],
[Extent4].[UploadTicketId] AS [UploadTicketId],
[Extent4].[UploadStatus] AS [UploadStatus],
[Extent4].[CompanyId] AS [CompanyId1],
[Extent4].[CompanyLocationId] AS [CompanyLocationId1],
[Extent4].[CustomerId] AS [CustomerId],
[Extent4].[CreatedOn] AS [CreatedOn2],
CASE WHEN ([Extent4].[Id] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C2]
FROM (SELECT TOP (20) [Project2].[Id] AS [Id], [Project2].[CompanyId] AS [CompanyId], [Project2].[CompanyLocationId] AS [CompanyLocationId], [Project2].[FirstName] AS [FirstName], [Project2].[LastName] AS [LastName], [Project2].[Email] AS [Email], [Project2].[Address1] AS [Address1], [Project2].[Address2] AS [Address2], [Project2].[City] AS [City], [Project2].[State] AS [State], [Project2].[Country] AS [Country], [Project2].[Zip] AS [Zip], [Project2].[Phone] AS [Phone], [Project2].[SaleDate] AS [SaleDate], [Project2].[Notes] AS [Notes], [Project2].[Cost] AS [Cost], [Project2].[CreatedOn] AS [CreatedOn], [Project2].[ModifiedOn] AS [ModifiedOn], [Project2].[PrimaryReviewSiteId] AS [PrimaryReviewSiteId], [Project2].[Id1] AS [Id1], [Project2].[CreatedOn1] AS [CreatedOn1], [Project2].[Id2] AS [Id2], [Project2].[SubscriptionTypeId] AS [SubscriptionTypeId], [Project2].[PlanFeeAmount] AS [PlanFeeAmount], [Project2].[LoginId] AS [LoginId], [Project2].[IndustryTypeId] AS [IndustryTypeId], [Project2].[CompanyName] AS [CompanyName], [Project2].[NumberOfLocations] AS [NumberOfLocations], [Project2].[WebsiteUrl] AS [WebsiteUrl], [Project2].[blsActive] AS [blsActive], [Project2].[Pending] AS [Pending], [Project2].[ExpiryDate] AS [ExpiryDate], [Project2].[LogoImageName] AS [LogoImageName], [Project2].[C1] AS [C1]
FROM ( SELECT [Project2].[Id] AS [Id], [Project2].[CompanyId] AS [CompanyId], [Project2].[CompanyLocationId] AS [CompanyLocationId], [Project2].[FirstName] AS [FirstName], [Project2].[LastName] AS [LastName], [Project2].[Email] AS [Email], [Project2].[Address1] AS [Address1], [Project2].[Address2] AS [Address2], [Project2].[City] AS [City], [Project2].[State] AS [State], [Project2].[Country] AS [Country], [Project2].[Zip] AS [Zip], [Project2].[Phone] AS [Phone], [Project2].[SaleDate] AS [SaleDate], [Project2].[Notes] AS [Notes], [Project2].[Cost] AS [Cost], [Project2].[CreatedOn] AS [CreatedOn], [Project2].[ModifiedOn] AS [ModifiedOn], [Project2].[PrimaryReviewSiteId] AS [PrimaryReviewSiteId], [Project2].[Id1] AS [Id1], [Project2].[CreatedOn1] AS [CreatedOn1], [Project2].[Id2] AS [Id2], [Project2].[SubscriptionTypeId] AS [SubscriptionTypeId], [Project2].[PlanFeeAmount] AS [PlanFeeAmount], [Project2].[LoginId] AS [LoginId], [Project2].[IndustryTypeId] AS [IndustryTypeId], [Project2].[CompanyName] AS [CompanyName], [Project2].[NumberOfLocations] AS [NumberOfLocations], [Project2].[WebsiteUrl] AS [WebsiteUrl], [Project2].[blsActive] AS [blsActive], [Project2].[Pending] AS [Pending], [Project2].[ExpiryDate] AS [ExpiryDate], [Project2].[LogoImageName] AS [LogoImageName], [Project2].[C1] AS [C1], row_number() OVER (ORDER BY [Project2].[CreatedOn1] ASC) AS [row_number]
FROM ( SELECT
[Filter1].[Id] AS [Id],
[Filter1].[CompanyId] AS [CompanyId],
[Filter1].[CompanyLocationId] AS [CompanyLocationId],
[Filter1].[FirstName] AS [FirstName],
[Filter1].[LastName] AS [LastName],
[Filter1].[Email] AS [Email],
[Filter1].[Address1] AS [Address1],
[Filter1].[Address2] AS [Address2],
[Filter1].[City] AS [City],
[Filter1].[State] AS [State],
[Filter1].[Country] AS [Country],
[Filter1].[Zip] AS [Zip],
[Filter1].[Phone] AS [Phone],
[Filter1].[SaleDate] AS [SaleDate],
[Filter1].[Notes] AS [Notes],
[Filter1].[Cost] AS [Cost],
[Filter1].[CreatedOn] AS [CreatedOn],
[Filter1].[ModifiedOn] AS [ModifiedOn],
[Filter1].[PrimaryReviewSiteId] AS [PrimaryReviewSiteId],
[Limit1].[Id] AS [Id1],
[Limit1].[CreatedOn] AS [CreatedOn1],
[Extent3].[Id] AS [Id2],
[Extent3].[SubscriptionTypeId] AS [SubscriptionTypeId],
[Extent3].[PlanFeeAmount] AS [PlanFeeAmount],
[Extent3].[LoginId] AS [LoginId],
[Extent3].[IndustryTypeId] AS [IndustryTypeId],
[Extent3].[CompanyName] AS [CompanyName],
[Extent3].[NumberOfLocations] AS [NumberOfLocations],
[Extent3].[WebsiteUrl] AS [WebsiteUrl],
[Extent3].[blsActive] AS [blsActive],
[Extent3].[Pending] AS [Pending],
[Extent3].[ExpiryDate] AS [ExpiryDate],
[Extent3].[LogoImageName] AS [LogoImageName],
1 AS [C1]
FROM (SELECT [Extent1].[Id] AS [Id], [Extent1].[CompanyId] AS [CompanyId], [Extent1].[CompanyLocationId] AS [CompanyLocationId], [Extent1].[FirstName] AS [FirstName], [Extent1].[LastName] AS [LastName], [Extent1].[Email] AS [Email], [Extent1].[Address1] AS [Address1], [Extent1].[Address2] AS [Address2], [Extent1].[City] AS [City], [Extent1].[State] AS [State], [Extent1].[Country] AS [Country], [Extent1].[Zip] AS [Zip], [Extent1].[Phone] AS [Phone], [Extent1].[SaleDate] AS [SaleDate], [Extent1].[Notes] AS [Notes], [Extent1].[Cost] AS [Cost], [Extent1].[CreatedOn] AS [CreatedOn], [Extent1].[ModifiedOn] AS [ModifiedOn], [Extent1].[PrimaryReviewSiteId] AS [PrimaryReviewSiteId]
FROM [dbo].[Customer] AS [Extent1]
WHERE (([Extent1].[FirstName] LIKE @p__linq__0 ESCAPE N'~') OR ([Extent1].[LastName] LIKE @p__linq__1 ESCAPE N'~') OR ([Extent1].[Email] LIKE @p__linq__2 ESCAPE N'~') OR ([Extent1].[FirstName] + N' ' + [Extent1].[LastName] LIKE @p__linq__3 ESCAPE N'~')) AND ([Extent1].[CompanyId] = @p__linq__4) AND ([Extent1].[CompanyLocationId] = @p__linq__5) ) AS [Filter1]
OUTER APPLY (SELECT TOP (1)
[Extent2].[Id] AS [Id],
[Extent2].[CreatedOn] AS [CreatedOn]
FROM [dbo].[EmailCampaignerStatus] AS [Extent2]
WHERE [Filter1].[Id] = [Extent2].[CustomerId] ) AS [Limit1]
LEFT OUTER JOIN [dbo].[Company] AS [Extent3] ON [Filter1].[CompanyId] = [Extent3].[Id]
) AS [Project2]
) AS [Project2]
WHERE [Project2].[row_number] > 0
ORDER BY [Project2].[CreatedOn1] ASC ) AS [Limit2]
LEFT OUTER JOIN [dbo].[EmailCampaignerStatus] AS [Extent4] ON [Limit2].[CompanyId] = [Extent4].[CompanyId]
) AS [Project3]
ORDER BY [Project3].[CreatedOn1] ASC, [Project3].[Id1] ASC, [Project3].[Id] ASC, [Project3].[Id2] ASC, [Project3].[C2] ASC
SELECT
[GroupBy1].[A1] AS [C1]
FROM ( SELECT
COUNT(1) AS [A1]
FROM [dbo].[Customer] AS [Extent1]
WHERE (([Extent1].[FirstName] LIKE @p__linq__0 ESCAPE N'~') OR ([Extent1].[LastName] LIKE @p__linq__1 ESCAPE N'~') OR ([Extent1].[Email] LIKE @p__linq__2 ESCAPE N'~') OR ([Extent1].[FirstName] + N' ' + [Extent1].[LastName] LIKE @p__linq__3 ESCAPE N'~')) AND ([Extent1].[CompanyId] = @p__linq__4) AND ([Extent1].[CompanyLocationId] = @p__linq__5)
) AS [GroupBy1]
SELECT
CASE WHEN ( EXISTS (SELECT
1 AS [C1]
FROM [dbo].[CompanyReviewSites] AS [Extent1]
WHERE [Extent1].[CompanyLocationId] = @p__linq__0
)) THEN cast(1 as bit) WHEN ( NOT EXISTS (SELECT
1 AS [C1]
FROM [dbo].[CompanyReviewSites] AS [Extent2]
WHERE [Extent2].[CompanyLocationId] = @p__linq__0
)) THEN cast(0 as bit) END AS [C1]
FROM ( SELECT 1 AS X ) AS [SingleRowTable1]
SELECT
1 AS [C1],
[Extent1].[Id] AS [Id],
[Extent1].[RiviewSiteId] AS [RiviewSiteId],
[Extent1].[URL] AS [URL],
[Extent1].[CompanyId] AS [CompanyId],
[Extent1].[CompanyLocationId] AS [CompanyLocationId],
[Extent2].[Id] AS [Id1],
[Extent2].[ReviewSiteName] AS [ReviewSiteName],
[Extent2].[ImageName] AS [ImageName]
FROM [dbo].[CompanyReviewSites] AS [Extent1]
INNER JOIN [dbo].[ReviewSites] AS [Extent2] ON [Extent1].[RiviewSiteId] = [Extent2].[Id]
WHERE [Extent1].[CompanyLocationId] = @p__linq__0
答案 0 :(得分：2)
可能有很多原因：
您是否能够获取SQL服务器日志，查看活动监视器或运行SQL事件探查器。根据我的经验，这样的问题很难追查，所以只能祝你好运
答案 1 :(得分：2)
当我遇到类似问题时;我们的服务器之后几乎为每个查询编制索引。此外，在整个公司大量使用后，它随机出现了类似的问题。我解决了它：
处置临时对象/包含在using语句中。这使我可以保留存储在内存中的任何对象，查询或任何数据。
另一个问题;是我们的开发人员之一在整个应用程序中保持打开/关闭连接。我试图创建用法;打开一次，然后立即执行所有期望的任务。它可能会迫使一些重新设计;但它使它更加健壮。甚至不在每个班级开/关;但是当你准备好提交它然后在课程开放时添加所需的课程也可以提供帮助。
下一个困境是验证所有缓存的项目是否已清除。所以你不要经常存储它。
另一项是改变我们的Windows虚拟机索引。
Dispose / Using的示例： http://msdn.microsoft.com/en-us/library/fs2xkftw.aspx
public void SqlTransactionHere()
{
SqlTransaction tran = myConnection.BeginTransaction();
tran.Dispose();
}
帮助维持连接的示例;然后我们使用类似于以下的模式进行调用：
http://msdn.microsoft.com/en-us/magazine/cc947917.aspx
我们做了一些调整我们的服务器;因为我们的服务器开始分页并在存储器上存储太多数据，这也是陷入困境的。
您可以监控您的服务器;通过以下步骤：
然后输入：
strComputer =“ - ” 设置objWmiService = GetObject（“winmgmts：\”＆amp; strComputer＆amp;“\ root \ cimv2”） 设置colPageFiles = objWMIService.ExecQuery（“从Win32_PageFileSetting中选择*”）
对于colPageFiles中的每个objPageFile objPageFile.InitialSize = 384 objPageFile.MaximumSize = 1152 objPageFile.Put_ 下一步
以上是256 mb ram; “微软最好”。我们实际上将我们的初始尺寸降至50;最大大小为384.我们的服务器在启动时标记错误，说明我们将虚拟内存设置得太低。然而;我们的服务器性能确实增加了我们的应用程序。您实际上可以监视它的内存使用/虚拟内存使用情况以帮助计算。
如果您想编写一个应用程序，请监视并为您登录;或者想要使用Microsoft的内置控件： http://msdn.microsoft.com/en-us/library/system.diagnostics.process.virtualmemorysize64.aspx
您也可以在注册表中更改它：
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
您还可以清除缓存。这可以通过利用：
来完成他们可以帮助清除一些与缓存相关的问题;重新启动SQL Server或Windows完成同样的事情。这就是为什么它可以解决您的问题。但又发生了;如果它太长了。
以下是SQL Performance Scripts的一篇很棒的文章：
这篇文章非常适合帮助排查或查找性能问题： http://support.microsoft.com/kb/298475
或者，如果你不想做任何这样的事情，因为它正在工作，但在使用和批量使用几天后会抛出异常。您只需创建一个PowerShell脚本;用：
脚本：“设置时间表” Restart-Computer -ComputerName localhost
然后转到您的注册表：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
您也可以编辑或添加字符串值。如果它不存在。
希望那些帮助你的人;这些是我们必须做的一些事情来解决我们的问题。你可能只需要做一个，或者不做。但我确实希望能帮助社区提供一些有助于更好地解决问题的想法。
但对我来说，这听起来像你的服务器内存陷入困境，数据太多，而且由于机器陷入困境，它无法解析或运行命令。我假设您使用的是Windows Server，如果不是，那些Powershell脚本命令就没用了。
答案 2 :(得分：1)
如果其他人来这里寻找这个问题的答案，我遇到了同样的问题，我的问题是SQL Server正在缓存结果。
我必须在我的SQL查询结尾添加OPTION (RECOMPILE)。
我问同样的问题，可以在我的问题的答案中找到解释：EntityCommandExecutionException Timeout Expired Only Sometimes
答案 3 :(得分：0)
我认为这是索引和刷新所有索引临时数据的问题。这称为统计数据，当SQL服务器收集所有可用的缓存变量时，所以它将它们用作索引服务的现金。所以更新SQL数据库中的统计数据可能会有所帮助
DECLARE @SQL VARCHAR(1000)
DECLARE @DB sysname
DECLARE curDB CURSOR FORWARD_ONLY STATIC FOR
SELECT [name]
FROM master..sysdatabases
WHERE [name] NOT IN ('model', 'tempdb')
ORDER BY [name]
OPEN curDB
FETCH NEXT FROM curDB INTO @DB
WHILE @@FETCH_STATUS = 0
BEGIN
SELECT @SQL = 'USE [' + @DB +']' + CHAR(13) + 'EXEC sp_updatestats' + CHAR(13)
PRINT @SQL
FETCH NEXT FROM curDB INTO @DB
END
CLOSE curDB
DEALLOCATE curDB
然后执行该查询......
答案 4 :(得分：0)
有些事情会浮现在脑海中。你有没有运行负载测试？它可能在您的计算机和服务器上都可以正常工作，但几天之后会有几千次点击，这可能是另一回事。这似乎是你提到的行为。
也许第一个查询只有200行，但第三天的同一个查询必须搜索200万，这会让事情变得缓慢。
正如其他人所说的那样。看看改进db表上的索引（如果这是一个选项）。
是否可以重新编写Linq查询。也许它的编写方式是阻止SQL将查询执行计划缓存在RAM中。
服务器本身是否已备份？当托管公司通过拍摄我们的数据库所在的虚拟机快照来影响作业时，我已经有了实例，而不是基于云的服务器。