我在 rackspace 云服务器上托管了我的网站。
有时我在从数据库中获取记录时遇到以下异常。奇怪的是，在重新启动后的几天内一切正常，而且我只在少数地方而不是所有地方都得到了这个异常。
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
下面提到了我的 Linq 查询
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，但是执行时间每天都在增加，并且在几天后无法执行（有时会失败，有时会给出结果）。
我观察到它花费了 31.05 秒并且失败了，它花费了 51.09 秒并且失败了。有时需要超过 2 分钟并给出结果。
我与 rackspace 的人交谈过，但他们无法追踪相同的实际原因。
编辑 1：我在 SQL Profiler 中看到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