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Posted By:      Posted Date: December 04, 2010    Points: 0   Category :Sql Server

What’s the significance of Lock:Timeout?

Does this play any role in the performance degradation of SQL Server?


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Lock Timeout on __SysObjects?


I'm using SQL Compact 3.5 SP2. My application is multi-threaded, but it does not share connections across threads. Instead, I use a custom object pool to ensure that each thread gets its own connection. That said, it's possible that a connection might be re-used on different threads at different times... in other words, I'm assuming that the connections don't have thread affinity. Also, not sure if it matters, but I'm using Entity Framework in .NET 3.5 SP1.

Anyway, when I've got high load situations (8+ threads), I'm getting lock timeout exceptions (regardless of the length of the timeout setting), and the exception always says the lock was on the __SysObjects table.

I'm not doing any DDL, so I don't understand why I would get locking timeouts on that table. Ideas?

The exact error is:

An error occurred while executing the command definition. See the inner exception for details. ---> SQL Server Compact timed out waiting for a lock. The default lock time is 2000ms for devices and 5000ms for desktops. The default lock timeout can be increased in the connection string using the ssce: default lock timeout property. [ Session id = 11,Thread id = 7224,Process id = 8592,Table name = __SysObjects,Conflict type = x lock (s blocks),Resource = RID: 1030:29 ]

Timeout expired. The timeout period elapsed prior to completion of the operation or the server is no



 I keep getting the following error. I also added time out parameter in the connection stirng and it still did not help. Has any one faced similar issues.

Thanks in adavance.

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.

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.]

SQL 2008 timeout


I am recently getting a timeout exception when executing this method. This table stores images and it might be due to the size of the table. I have no idea! Help!


 Public Sub StoreFile(ByVal fileId As Integer, ByVal upload As Stream, ByVal connection As SqlConnection)
            Dim bufferLen As Integer = 8040
            Dim br As BinaryReader = New BinaryReader(upload)
            Dim chunk As Byte()
            chunk = br.ReadBytes(bufferLen)

            Dim cmd As SqlCommand = _
            New SqlCommand("UPDATE tblContactDocuments SET ContractDocument=@Buffer WHERE AutoID=@FileId", _
            cmd.CommandTimeout = 30
            cmd.Parameters.AddWithValue("@FileId", fileId)
            cmd.Parameters.Add("@Buffer", SqlDbType.VarBinary, bufferLen).Value = chunk

            Dim cmdAppend = New SqlCommand("UPDATE tblContactDocuments SET CONTRACTDOCUMENT.WRITE(@Buffer, NULL, 0) WHERE AutoID=@FileId", _
            cmdAppend.Parameters.AddWithValue("@FileId", fileId)
            cmdAppend.Parameters.Add("@Buffer", SqlDbType.VarBinary, bufferLen)
            chunk = br.ReadBytes(bufferLen)

            While (c

ReadXML Timeout


I am reading an XML file from an external URL and putting it into a dataset that is the populates a repeater. This works fine when I run it locally, however on the published web site I receive A connection attempt failed because the connected party did not properly respond after a period of time error messages.

However, if i type the URL directly into a browser, I get the XML file almost immeadately which leads me to believe that I am going about this the wrong way or I need to some how to extend the timeout period.

Here is my code:

Protected Sub ButtonValidate_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ButtonValidate.Click
        If Page.IsValid = False Then
        End If

        TableCellVATSIMIDResults.Text = "<br />VATSIM ID Validation Results for <i>" & TextBoxVATSIMID.Text & "</i>"
        Dim DataSetVATSIMValidation As New DataSet
        DataSetVATSIMValidation.ReadXml("http://cert.vatsim.net/cert/vatsimnet/idstatus.php?cid=" & TextBoxVATSIMID.Text)


<asp:Repeater runat="server" ID="RepeaterVATSIMValidation">
                    <HeaderTemplate />

Concurrent Affairs: Build a Richer Thread Synchronization Lock


In my last column, I showed the various thread synchronization mechanisms employed by the Microsoft® . NET Framework (see Concurrent Affairs: Performance-Conscious Thread Synchronization). I then examined the performance characteristics of all these mechanisms and determined that the Interlocked methods performed the best because the calling thread never has to transition to kernel mode.

Jeffrey Richter

MSDN Magazine March 2006

Memory Models: Understand the Impact of Low-Lock Techniques in Multithreaded Apps


Because the use of low-lock techniques in your application significantly increases the likelihood of introducing hard-to-find bugs, it is best to use them only when absolutely necessary. Here Vance Morrison demonstrates the limitations and subtleties low-lock techniques so that if you are forced to use them you have a better chance of using them correctly.

Vance Morrison

MSDN Magazine October 2005

C++ Q&A: Performance Monitoring, Managed Extensions, and Lock Toolbars


In the June 2004 issue of MSDN®Magazine, I described a class called ShowTime that you can use to do simple performance monitoring for your app. ShowTime uses its constructor/destructor to record the start/stop times of its existence so you can instantiate it in a block of code like so: { ShowTime st(_T("Total time is:")); // some lengthy operation } .

Paul DiLascia

MSDN Magazine September 2004

How to set session timeout and clear session in asp.net C# ? And kill session when close the web app


hi ,

How to set session timeout and clear session in web.config and login.aspx  ? And when we close the web application , the session must be cleared ?

I have use session.abandon as per below but is not working . Pls advise .


        protected void btnLogout_Click(object sender, EventArgs e)



session timeout


hi there,

is it possible that session time out is calculated in seconds and not in minutes?

i am setting it at web.config, global.asax, default.aspx and at the web server to 30 (minutes) and session last exactly for 30 seconds.



Session Timeout increase to 2 hours.



    for Business needs i am planning to increase the session timeout to 2 hours(120 min) in one application, i am using sql server session state. if i increase to 2 hours of session time out, how it will effect the performance of application and web server.

   Could any one help me on this.






Timeout Property, how do i handle timeout


iam using technique mentioned in this tutorial

i also added this AsyncTimeout="300" in page element


the query is correct, how do i handle timeout

Error in: searchresumes.aspx

searchquery was countryid=1 and hide='N' and stateid='34' and cityid='347' and industryid='7' and jobcategoryid='3' and totalexp>=0 and totalexp<=1 and CONTAINS(entirecv, '"Freshers" or "call+center" or "bpo" or "kpo"')

- Hide quoted text -

Error Message: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
Stack Trace:
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavi

Timeout polling in server

hi all,           i have done one website and i upload to all file in server..After two day i got error from website starting page Timout error.. too many connections are there so polling timeout.. i dont know how to solve this problem anybody please reply me..

Very slow regasm.exe and aspnet_regiis.exe make a setup timeout.

Hello, I originally posted my problem in the Exchange forum, but I think that it is an ASP.NET issue. The Exchange setup launch "aspnet_regiis -config+" command with maximum timeout of 120 seconds. If I manually launch the command, it take 240 seconds for a successful résult. I found that this command use regasm.exe, witch take 3.5 Minutes just for help (regasm.exe /?) All details are on : http://social.technet.microsoft.com/Forums/en/exchange2010/thread/70d8cbfa-6e9e-47be-87b8-969ad1a581aa Can you help me ? Syncerely Yours, David.MCSE, MCITP Exchange 2K7 & 2K10

Why does this query timeout in an application but not in Management Studio?

I have a query that looks something like this:   SELECT TOP 1 * FROM Customers c (NOLOCK) WHERE Key = (mykey) AND NOT EXISTS (SELECT 0 FROM Invoices i (NOLOCK) WHERE i.key = c.key AND i.Date > GETDATE() )   When I run this inside an (ODBC) application, it times out.   When I run it within SSMS, it works fine.  That might make you think its an application problem, but the timeout only occurs for one specific customer ... even in the application, it works fine for all other key values.    Any idea where I can even start looking for a solution to this?  Thanks.

Cannot timeout connections when a network outage occurs

Hi, We are running SQL Server 2008 in a mirrored configuration.  Client access is performed using the Microsoft JDBC 2.0 driver, configured to failover to the Mirror in the event the Primary database is unavailable.  Additionally, the client maintains a database connection pool using Apache DBCP's BasicDataSource.  During testing, we have found that the failover works flawlessly if either the primary Database is taken offline or the primary SQL Server service is stopped - attempts to use existing pooled connections to the primary database fail immediately and new connections are created to the mirror database. However, when simulating a network failure (by disabling the network interface on the SQL Server machine) things aren't so nice.  The client first attempts to use an existing pooled connection to the primary database.  At this point the client hangs for up to 15 minutes before failing with the following error: Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: Connection timed out         at com.microsoft.sqlserver.jdbc.SQLServerConnection.terminate(SQLServerConnection.java:1368)         at com.microsoft.sqlserver.jdbc.SQLServerConnection.terminate(SQLServerConnection.java:1355)         at com.microsoft.sqlserver.jdbc.TDSChannel.r

Lock the window size to uniform in wpf

I have a window that contain a ViewBox. The ViewBox's Streach property is set to Uniform. And I want to set the window size to be uniform! that means the Height And Width properties are relative to each other.
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