Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. The statement has been terminated

277

I have many users on my web site (20000-60000 per day), which is a download site for mobile files. I have remote access to my server (windows server 2008-R2).
I've received "Server is unavailable" errors before, but am now seeing a connection timeout error.
I'm not familiar with this - why does it occur and how can I fix it?

The full error is below:

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


EDIT AFTER ANSWERS:
my Application_Start in Global.asax is like below:

protected void Application_Start(object sender, EventArgs e)
{
    Application["OnlineUsers"] = 0;

    OnlineUsers.Update_SessionEnd_And_Online(
        DateTime.Now,
        false);

    AddTask("DoStuff", 10);
}

The stored procedure being called is:

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

I have two methods for getting online users:

  1. using Application["OnlineUsers"] = 0;
  2. the other one using database

So, for method #2 I reset all OnlineUsers at Application_Start. There are over 482,751 records in that table.

c#
asp.net
sql-server-2008-r2
timeout
sqlcommand
asked on Stack Overflow Dec 22, 2011 by SilverLight • edited Jan 17, 2019 by Muhammad Ashikuzzaman

15 Answers

318

Looks like you have a query that is taking longer than it should. From your stack trace and your code you should be able to determine exactly what query that is.

This type of timeout can have three causes;

  1. There's a deadlock somewhere
  2. The database's statistics and/or query plan cache are incorrect
  3. The query is too complex and needs to be tuned

A deadlock can be difficult to fix, but it's easy to determine whether that is the case. Connect to your database with Sql Server Management Studio. In the left pane right-click on the server node and select Activity Monitor. Take a look at the running processes. Normally most will be idle or running. When the problem occurs you can identify any blocked process by the process state. If you right-click on the process and select details it'll show you the last query executed by the process.

The second issue will cause the database to use a sub-optimal query plan. It can be resolved by clearing the statistics:

exec sp_updatestats

If that doesn't work you could also try

dbcc freeproccache

You should not do this when your server is under heavy load because it will temporarily incur a big performace hit as all stored procs and queries are recompiled when first executed. However, since you state the issue occurs sometimes, and the stack trace indicates your application is starting up, I think you're running a query that is only run on occasionally. You may be better off by forcing SQL Server not to reuse a previous query plan. See this answer for details on how to do that.

I've already touched on the third issue, but you can easily determine whether the query needs tuning by executing the query manually, for example using Sql Server Management Studio. If the query takes too long to complete, even after resetting the statistics you'll probably need to tune it. For help with that, you should post the exact query in a new question.

answered on Stack Overflow Dec 22, 2011 by Marnix van Valen • edited May 23, 2017 by Community
144

In your code where you run the stored procedure you should have something like this:

SqlCommand c = new SqlCommand(...)
//...

Add such a line of code:

c.CommandTimeout = 0;

This will wait as much time as needed for the operation to complete.

answered on Stack Overflow Dec 22, 2011 by Elastep • edited Jan 16, 2013 by Otiel
24

You could set the CommandTimeout property of the SQL Command to allow for the long running SQL transaction.

You might also need to look at the SQL Query that is causing the timeout.

answered on Stack Overflow Dec 22, 2011 by Kev Ritchie • edited Nov 24, 2015 by Ry-
12

While all the earlier responses address the issue they did not cover all cases.

Microsoft has acknowledged the issue and fixed it in 2011 for supported operating systems, so if you get the stack trace like:

Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()
at System.Data.SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject stateObj, UInt32 error)
at System.Data.SqlClient.TdsParserStateObject.ReadSni(DbAsyncResult asyncResult, TdsParserStateObject stateObj)

you may need to update your .NET assemblies.

This issue occurs because of an error in the connection-retry algorithm for mirrored databases.

When the retry-algorithm is used, the data provider waits for the first read (SniReadSync) call to finish. The call is sent to the back-end computer that is running SQL Server, and the waiting time is calculated by multiplying the connection time-out value by 0.08. However, the data provider incorrectly sets a connection to a doomed state if a response is slow and if the first SniReadSync call is not completed before the waiting time expires.

See KB 2605597 for details

https://support.microsoft.com/kb/2605597

answered on Stack Overflow Feb 20, 2015 by matcheek • edited Feb 25, 2015 by matcheek
9

Maybe it will be useful for somebody. I faced with the same problem and in my case the reason was the SqlConnection was opened and not disposed in the method that I called in loop with about 2500 iterations. Connection pool was exhausted. Proper disposing solved the problem.

answered on Stack Overflow Feb 19, 2015 by eternity
6

I faced same problem worked on it around 3 days. I noticed as our number of records are not much our senior developer keeps 2 images and Fingerprint in database. When I try to fetch this hex values it taking long time, I calculate average time to execute my procedure its around 38 seconds. The default commandtimeout is 30 seconds so its less than average time required to run my stored procedure. I set my commandtimeout like below

cmd.CommandTimeout = 50

and its working fine but sometimes if your query takes more than 50 seconds it will prompt same error.

answered on Stack Overflow Jun 29, 2015 by Vijay Kumbhoje • edited Jun 29, 2015 by Vijay Kumbhoje
6

You have to set CommandTimeout attribute. You can set the CommandTimeout attribute in DbContext child class.

public partial class StudentDatabaseEntities : DbContext
{
    public StudentDatabaseEntities()
        : base("name=StudentDatabaseEntities")
    {
        this.Database.CommandTimeout = 180;
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        throw new UnintentionalCodeFirstException();
    }

    public virtual DbSet<StudentDbTable> StudentDbTables { get; set; }
}
answered on Stack Overflow Apr 25, 2017 by Siddarth Kanted
4

I encountered this error recently and after some brief investigation, found the cause to be that we were running out of space on the disk holding the database (less than 1GB).

As soon as I moved out the database files (.mdf and .ldf) to another disk on the same server (with lots more space), the same page (running the query) that had timed-out loaded within three seconds.

One other thing to investigate, while trying to resolve this error, is the size of the database log files. Your log files just might need to be shrunk.

answered on Stack Overflow Sep 10, 2014 by Hafiz Adewuyi
3

I have issue with large calculation in sp_foo that take large time so i fixed
with this little bit code

public partial class FooEntities : DbContext
{
   public FooEntities()
         : base("name=FooEntities")
    {
        this.Configuration.LazyLoadingEnabled = false;

        // Get the ObjectContext related to this DbContext
        var objectContext = (this as IObjectContextAdapter).ObjectContext;

        // Sets the command timeout for all the commands
        objectContext.CommandTimeout = 380;
    }
answered on Stack Overflow Dec 27, 2016 by Nabeel Iqbal • edited Aug 1, 2017 by Hakan Fıstık
2

@SilverLight.. This is clearly an issue with a Database object. It can be a badly written query, or missing indexes. But as of now I won't suggest you to increase the timeout without investigating the issue with your Database objects

NovinMedia.Data.DbObject.RunProcedure(String storedProcName, IDataParameter[] parameters, Int32& rowsAffected) +209

Put a breakpoint on this line of code to findout the procedure name and then optimise the procedure by looking at its execution plan.

I cannot help you more till the time you post details about the stored procedure.

answered on Stack Overflow Dec 22, 2011 by Amit Rai Sharma
1

try

EXEC SP_CONFIGURE 'remote query timeout', 1800
reconfigure
EXEC sp_configure

EXEC SP_CONFIGURE 'show advanced options', 1
reconfigure
EXEC sp_configure

EXEC SP_CONFIGURE 'remote query timeout', 1800
reconfigure
EXEC sp_configure

then rebuild your index

answered on Stack Overflow Feb 22, 2013 by maksoud
1

Default timeout is 15 seconds, to change that, 0 is unlimited, any other number is the number of seconds.

In Code

using (SqlCommand sqlCmd = new SqlCommand(sqlQueryString, sqlConnection))
   {
      sqlCmd.CommandTimeout = 0; // 0 = give it as much time as it needs to complete
      ...
    }

In Your Web.Config, "Command Timeout=0;" do not time out, or as below 1 hour (3600 seconds)

  <add name="ConnectionString" connectionString="Data Source=ServerName;User ID=UserName;Password=Password;Command Timeout=3600;" providerName="System.Data.SqlClient" />
answered on Stack Overflow Mar 13, 2019 by David C Fuchs
0

Timeout expired because the sql query is taking more time than you set in sqlCommand.CommandTimeout property.

Obviously you can increase CommandTimeout to solve this issue but before doing that you must optimize your query by adding index. If you run your query in Sql server management studio including actual execution plan then Sql server management studio will suggest you proper index. Most of the case you will get rid of timeout issue if you can optimize your query.

answered on Stack Overflow Mar 20, 2019 by Khabir
0

TLDR:

  1. Rebooting both application and DB servers is the quickest fix where data volume, network settings and code haven't changed. We always do so as a rule
  2. May be indicator of failing hard-drive that needs replacement - check system notifications

I have often encountered this error for various reasons and have had various solutions, including:

  1. refactoring my code to use SqlBulkCopy
  2. increasing Timeout values, as stated in various answers or checking for underlying causes (may not be data related)
  3. Connection Timeout (Default 15s) - How long it takes to wait for a connection to be established with the SQL server before terminating - TCP/PORT related - can go through a troubleshooting checklist (very handy MSDN article)
  4. Command Timeout (Default 30s) - How long it takes to wait for the execution of a query - Query execution/network traffic related - also has a troubleshooting process (another very handy MSDN article)
  5. Rebooting of the server(s) - both application & DB Server (if separate) - where code and data haven't changed, environment must have changed - First thing you must do. Typically caused by patches (operating system, .Net Framework or SQL Server patches or updates). Particularly if timeout exception appears as below (even if we do not use Azure):
    • System.Data.Entity.Core.EntityException: An exception has been raised that is likely due to a transient failure. If you are connecting to a SQL Azure database consider using SqlAzureExecutionStrategy. ---> System.Data.Entity.Core.EntityCommandExecutionException: An error occurred while executing the command definition. See the inner exception for details. ---> System.Data.SqlClient.SqlException: A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The semaphore timeout period has expired.) ---> System.ComponentModel.Win32Exception: The semaphore timeout period has expired
answered on Stack Overflow Jun 27, 2019 by user919426 • edited Jun 27, 2019 by user919426
0

Also make sure you just don't have a pending transaction. :)

I was doing some tests around and began a transaction to be safe but never closed it. I wish the error would have been more explicit but oh well!

answered on Stack Overflow Aug 9, 2019 by JeromeJ

User contributions licensed under CC BY-SA 3.0