我的网站上有很多用户（每天20000-60000），这是一个移动文件的下载网站。我可以远程访问我的服务器（Windows Server 2008-R2）。
我收到了“服务器不可用”错误，但现在看到连接超时错误。
我对此不熟悉 - 为什么会发生，我该如何解决？下面超时已过期。操作完成之前超时的时间或服务器没有响应。声明已被终止
完整的错误是：
Server Error in '/' Application. Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. The statement has been terminated. 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. The statement has been terminated.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[SqlException (0x80131904): Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. The statement has been terminated.]
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.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +6387741
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +6389442
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +538
System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) +689
System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +327
NovinMedia.Data.DbObject.RunProcedure(String storedProcName, IDataParameter[] parameters, Int32& rowsAffected) +209
DataLayer.OnlineUsers.Update_SessionEnd_And_Online(Object Session_End, Boolean Online) +440
NiceFileExplorer.Global.Application_Start(Object sender, EventArgs e) +163[HttpException (0x80004005): Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. The statement has been terminated.]
System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +4052053
System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +191
System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +352
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +407
System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +375[HttpException (0x80004005): Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. The statement has been terminated.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +11686928 System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +141 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +4863749
编辑应答后：
我Application_Start在Global.asax是象下面这样：
protected void Application_Start(object sender, EventArgs e)
{
Application["OnlineUsers"] = 0;
OnlineUsers.Update_SessionEnd_And_Online(
DateTime.Now,
false);
AddTask("DoStuff", 10);
}
被调用存储过程是：
ALTER Procedure [dbo].[sp_OnlineUsers_Update_SessionEnd_And_Online]
@Session_End datetime,
@Online bit
As
Begin
Update OnlineUsers
SET
[Session_End] = @Session_End,
[Online] = @Online
End
我有让在线用户两种方法：使用Application["OnlineUsers"] = 0;
所以，方法＃2我重置所有OnlineUsers在Application_Start
- 。该表中有超过482,751条记录。
作为这里说的[默认为15秒]（http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectiontimeout.aspx） – V4Vendetta 2011-12-22 10:36:42
更好地使根原因分析，造成这样的问题有各种原因。最基本的是查询的复杂结构。当我在表格中获取以十六进制值存储的图像时，我遇到了同样的问题。 – 2015-06-29 10:21:45
除了上面的原因，我会再添加一个：锁定超时：https：//docs.microsoft.com/en-us/sql/t-sql/statements/set-lock-timeout-transact-sql如果这线程等待锁定时间过长，会基于上述文件超时。 – 2017-05-15 20:56:42