SQL Server, Connection Pool And Connections Remaining.
Dec 19, 2003
Hi
I have seen the threads already in here about connections and SQL Server but I too am having a connection pool problem.
I am explicitly making a connection, creating a command object, executing a datareader then closing the command and then disposing the connection. The connection just prior to the dispose is definately closed.
However when I do an sp_who in SQL Server the connection is still listed. I have a connection timeout of 30 seconds, so I am considering reducing this to 5 seconds but dont wish to. So therefore when a process is called repeatedly instead of using an existing connection in the pool, it thinks that this connection is still active and therefore creates a new connection. Because all of this is in an ascx, I cant code for one connection to stay open for all 30 instances of the control.
This is a problem because I am creating controls at run time and using page.databind and at that point, I exceed the connection pool and therefore the site crashes out to the "SQL Server Timeout" error.
Anyone else seen this?
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Feb 11, 2004
What does this error message imply?
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Feb 21, 2008
Hello.
I have a db dal containing the following code:
SqlCommand cmd = new SqlCommand();
cmd.Connection = dbc;
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "SOME STORED PROCEDURE";
.
.
.
declare some SqlParameters
.
.
.
dbc.Open();
cmd.ExecuteNonQuery();
dbc.Close();
This code, when concurrently running via several threads, yields the following exception:
"The connection was not closed. The connection's current state is open."
My questions are:
1. Why don't .Net allocate another connection from the pool (I try to only concurrently run 2 threads while there are 25 connections in the connection pool) ?
2. How can one explicitly allocate a connection?
3. How do you suggest to solve this problem without a mutex/monitor etc' on the 3 bold lines above and without BeginExequteNonQuery()?
Thank you !
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Feb 21, 2007
hi i'm having this error on my application"cannot allocate more connection.connect pool is at maximum increase max pool size" the proble is when i do testing this error does not apply it only Appears when the application is been used by many people
How can I resolve this?
Thanks
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Aug 22, 2006
HiI have written the following function public System.Data.SqlClient.SqlDataReader ExcuteReader(string strQuery, string strConnection) { System.Data.SqlClient.SqlCommand myCommand; System.Data.SqlClient.SqlDataReader myReader; myCommand = new System.Data.SqlClient.SqlCommand(strQuery, new System.Data.SqlClient.SqlConnection(strConnection)); myCommand.Connection.Open(); myReader = myCommand.ExecuteReader(); return myReader; }to return a datareader for me but right now I am facing the problem that it seems this function isn't closing the connection by itself which is resulting in an error saying "Timeout expired. The timeout period elapsed prior to
obtaining a connection from the pool. This may have occurred because
all pooled connections were in use and max pool size was reached" and if I close it manually I will lose the data in the readerso are there any suggestions of what I should do?thank you
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Nov 24, 2005
Hi,Can anyone tell me if he ever got this issue and how he get the solution. In my asp.net 2.0 application i close always ma connexions to sqlserver in the finally clause (the open is in the try); I open 1 ou 2 connecxions per aspx page, i close them always (in the finally clause or at the bottum of the form). Sometimes, the application is down with the messageCan not open a new connexion, max pool size is reached !!!!I host my application on a remote server, i have no performance issues, only this great problem !!!i cant view the status of connexion on the sqlserver, so what can i do, or how shoud i develop my connection.thanks in advance to all of yuo who will help me.Imed.
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Apr 7, 2005
Hi guys!
I have a dev server that has about 15-25 connections which is fine.
**
Looking at performance counters: _global_
under SqlClient: Current # connection pools
under SqlClient: Current # pooled connections
under SqlClient: Current # pooled and nonpooled connections
**
BUT when I look at staging and production I have only 4 or so...
WHAT'S GOING ON?!?! The querystring doesn't specify the max pool
size, pooling, nor timeout values. So I'm guessing it uses the
defaults. ( I also tried putting in max pool size, but it didn't
change anything! )
Does anyone know how I can increase the value? It is impacting the performance of the site considerably. Thank you!
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Mar 4, 2007
Hello,
I'm hosting with GoDaddy and I receive this error:
Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.
For sure the problem is "MAX POOL SIZE WAS REACHED". How do I solve this problem? Or how do I prevent this from happening in the future?
Now, I cannot open any of my pages on GoDaddy.
Any advice would be appreciated. Thank you.
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Dec 12, 2007
HI,
I am using SqlServer2005 as data base for my web application. I am able to connect to the database through DBCP connection pool . Its working fine for 2 user. When ever 2 users do transaction, it works fine. But 3 users do the transaction, its trowning error.Even i increase the pool size the behavior is same.
error:
com.microsoft.sqlserver.jdbc.SQLServerException: Server failed to resume the transaction, desc: 3f00000002.
For a change I wrote a connection pool to access the DB. I am getting the same error. i.e. Its working fine for 2 user and throws error for more than 2 users.
Is there any setting to be made?
Same application is working fine for Oracle10g.
Regrads
Rupesh
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Feb 16, 2007
client: ado.net 2.0 SqlClient, xp sp 2
server: sql server 2005, win 2k
I have a stored proc eg spProcA which does not start a transaction
If I call this proc from ado.net code without any transaction around it affecting the isolation level, the isolation level within the proc call is read committed, as expected
If I then call the same proc within a System.Transacstion.TransactionScope with a different isolation level eg Serializable, then i get the expected isolation level in the proc.
However, if i retry the proc without any transaction around it, the isolation level is now the same as the TransactionScope, (eg Serializable), and this persists until either the connection pool clears down (either because it becomes dormant or via an explicit ClearAllPools.
I can resolve this problem by setting the isolation level in every proc (or call to every proc), but i wondered if i am missing something more straight forward?
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Mar 14, 2007
I build an asp.net 2.0 (VS 2005) web application and put it on the server. The installed SQL server is SQL server 2003. I get this error message when i keep the application running for 10 or 15 mins. "Timeout expired. The timeout period elapsed prior obtaining a connection from the pool. This may have occure because all pooled connections were in use and max pool size was reached."
I made the server timeout unlimited but the error keeps coming up after some time of openning the application. The application session time out redirects the user to the login page and doesn't throw an error like the one i mentioned above.
Any idea. Thanks in advance.
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Jun 28, 2007
hello to all
my problem is
when in database it reaches nearly 100 active connections (i check it from detach database) , my application does not allow me to open new browser page and show me error like:
time out expire. the max connection pool is reached.
please help.
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Mar 31, 2004
how can i change pool buffer of all connections?
I receive this error for each connection:
System.InvalidOperationException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.
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Apr 12, 2007
From what I understand, some database drivers provide automatic database pooling, in the sense that when an application closes a connection, it is not dropped until after a certain timeout. If the same, or another application, request a connection then the "pooled" one is returned.
What's the situation with C#, .NET Compact Edition and SQLce? Is it a performance hit to open and close a connection, or is some kind of automatic pooling in effect?
Thanks.
Martin
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Oct 6, 2006
Hi All,I'm having a bit of a problem with a c# program which creates and index file/table. The number of records I need to process is around 3500, the main loop. Each of thoes records I need to look at a 2 text fields and create an entry in an index table for each valid word found in thoes fields. I call a stored proc to save the key word. So this stored proc get called numerous time per record.What seems to be happening is proceese about 400 main rcords the errors out with the following error message: {"Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached." }Has anyone had a similar problem? if so any suggestions on how to fix, I've been looking at this problem and recoding for the last 4 days! I need some help! Using SQL Server 2000 & .net v1.1Thanks in advance Davej
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Sep 26, 2007
Hi All,
Where Connection pool reside, is in client side(in .net framwork) memory or at server(in sql server) momory or at both side it maintains pool information?
Best RegardsImran Zubair
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Jan 15, 2008
I'm opening a large number of connections to a SQL server 2005 database using a SQL object based on the System.Data.SqlClient library. When I log out of the application, I call the ClearSQLConnectionPool method of the SQL object and this should clear the pool of these connections. This has worked in the past, but lately I have noticed some odd and very annoying behaviour.Very often I log out of the application and few, if any of the connections disappear. Just this morning I opened the application, logged out and all but one of the connections disappeared. Then I opened it again, logged out and none of the connections had gone. If I open the application again all of the past connections are still there plus the new ones.I know it works, its just very inconsistent. The problem may be with IIS, SQL or with library; I just can't tell which.Any ideas?Many thanks
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Jul 20, 2005
Dear GroupSorry for posting this here. I'm desperate for a solution to thisproblem and thought some of you might have come across it with .NETand SQL Server.Let's assume I've the following code:Private Sub Button4_Click(ByVal sender As System.Object, ByVal e AsSystem.EventArgs) Handles Button4.ClickDim sqlConnection As New System.Data.SqlClient.SqlConnectionsqlConnection.ConnectionString = "workstation id=THEINTREPIDFOX;packetsize=4096;user id=sa;data source=""(local)"";p" & _"ersist security info=False;initial catalog=TestDB"sqlConnection.Open()sqlConnection.Close()sqlConnection = NothingEnd SubWhen I click 100 times on the button the page finally times out with:Timeout expired. The timeout period elapsed prior to obtaining aconnection from the pool. This may have occurred because all pooledconnections were in use and max pool size was reached.Of course I could increase the max pool size but this isn't thesolution to this problem. I wonder what's wrong with my code?According to MSDN, if the connection is closed it's released back intothe pool. Also tried to dispose but nothing helps. It looks like thatit keeps connections and doesn't release them. I'm grateful for anyhints, ideas, suggestions on this problem as I'm very desperate tosolve this.Thanks very much for your time & efforts!Martin
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Sep 5, 2007
Hi,
I have recently installed SP2 for SQLServer 2005 and started to have connection pool issues. I have tried to explicitly mention the pool settings in connection string and yet pooling doesn't seem to work. I have one more box with no service packs applied and is pooling is perfect!. Has any one experienced this??
Thank you,
Viswanath Ivatury
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Nov 2, 2007
I was wondering if someone could help explaining how the SQL Server handles all incoming connections, I and a friend started a discussion about using the connection pool in ADO.NET or not in a specific case.
Usually when creating like an ASP.NET Page it's recommended to use the connection pool, because it optimizes the performance, by using already created connection, so we don't have to recreate the connection all the time. I have always thought that the connection in the connection pool had an open connection on the server. So 5 connections in the connection pool, would be 5 open connections at the server. But after having the discussion with my friend I am not so sure anymore.
Say that I would create a client application (.NET using ADO.NET) that connects to the database and work with that data. If I then have 1.000 clients and each client have a connection pool with 5 connections in it (I think that the default numbers for the connection pool), then there would be like 5.000 open connections on the SQL Server, where most of the connections actually never do anything more than hanging around and waiting... And then the connectionpool is not 1 per client but 1 per connectionstring.
So if my client scenario would access data from 2 different databases, there would actually be 10.000 open connections at the SQL Server. So now I think that there must be a server connection pool or something to handle the connection from the clients. So that there would only be like 10-50 open connections at the server for the 1.000 Clients that was connected.
How is it? Is there 1 open connection in the server for every connection in the connection pool? If that's the case, it would be better for the SQL Server if I don't not use the connection pool in the client, but instead open the connection when we need it, and then close it, and taking that little performance hit every time, to help the performance on the SQL Server.
Best regards
- Magnus
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Aug 6, 2007
Hi,
I am facing problem in configuring and using connection pooling on tomcat 5.0. I am using JDBC Driver v.1.1 for SQL Server 2005.
Can anybody point me to appropriate samle code or guideline?
Thanks & Regards,
Bhavin P Panchal
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Sep 6, 2007
Halo all
I have a problem with "timeout expired. Thei timeout periode elapsed prior to obtaining a connection from the pool. This may have occured because all pooled connections were use and max pool size was reached"
Then i explore and found out that i did not close my SqlDataReader, SqlDataAdapter, SqlCommand or my connection.
But i have a function that return a SqlDataReader.
Is this function will cause a connection problem?
Thanks in advance
Public Function GetDataReader(ByVal strSQL As String, ByVal DBCon As DB.DBConnection) As SqlDataReader Dim MyCommand As SqlCommand = New SqlCommand(strSQL, DBCon.GetConnection())
If DBCon.GetConnection().State = ConnectionState.Closed Then DBCon.GetConnection().Open() End If
Dim dr As SqlDataReader = MyCommand.ExecuteReader()
Return dr
dr.Close()
End Function
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Mar 4, 2005
Hi to all,
I am using a connection string like
data source=RemoteHostName;initial catalog=myDb;password=sa;user id=sa;
Max pool size = 200;
And now strange thing is happening ,, I am receiving error :
Timeout expired. The timeout period elapsed prior to obtaining a connection
from the pool. This may have occurred because all pooled connections were in
use and max pool size was reached
The SqlServer Activity Manager is telling that only 100 connections are pooled, and I guess that the Max pool size is 100, It is not being changed by my Connection string. As I am trying to change the default 100 pool size value to 200.
Huh , So stucked up , how to increase the Max pool size.. Is there any way .
I am getting worrried.
Any help ??
Thx and Regards
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Jan 22, 2008
My site works fine in VWD2008 express, but I get this error when I try to use it on my live website.
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.
According to this article: http://support.microsoft.com/kb/914277 I am supposed to:
1.
Click Start, point to Programs, point to Microsoft SQL Server 2005, point to Configuration Tools, and then click SQL Server Surface Area Configuration.
Ok, there is no such program in this folder. The only thing in there is "SQL Server Error and Usage Reporting"...
The other thing I am greatly concerned with is this: All is want is for my webpages to be able to access my database for user authentication. I DO NOT want to grant the internet rights to remote connect to my database.
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Apr 22, 2008
This is my code...
public partial class test : System.Web.UI.Page
{protected void Page_Load(object sender, EventArgs e)
{SqlDatabase database = (SqlDatabase)DatabaseFactory.CreateDatabase("ConnectionString");DbCommand command = database.GetSqlStringCommand("SELECT UserName FROM Users WHERE UserID = '6264'");
using (IDataReader reader = database.ExecuteReader(command))
{if (reader.Read())
{lblTest.Text = "test";
}
}
}
}
This is my error:
Server Error in '/' Application.
Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.
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.InvalidOperationException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.Source Error:
Line 21: //DbCommand command = database.GetStoredProcCommand("CorrUsers_GetByUserId_s");
Line 22: DbCommand command = database.GetSqlStringCommand("SELECT UserName FROM Users WHERE UserID = '6264'");
Line 23: database.ExecuteReader(command);
Line 24: using (IDataReader reader = database.ExecuteReader(command))
Line 25: {Source File: d:webwwwrootchacha078dev.cha.toplingo.com est.aspx.cs Line: 23 Stack Trace:
[InvalidOperationException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.]
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +1261381
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
System.Data.SqlClient.SqlConnection.Open() +111
Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection() +195
Microsoft.Practices.EnterpriseLibrary.Data.Database.GetOpenConnection(Boolean disposeInnerConnection) +106
Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command) +62
test.Page_Load(Object sender, EventArgs e) in d:webwwwrootchacha078dev.cha.toplingo.com est.aspx.cs:23
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +33
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +47
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436
Any help with this matter would be very much appreciated.
Thank you for your time.
Sincerely,
Jeffrey Pham
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Dec 10, 2007
I get the following error and have been trying to figure out why I keep getting it. Initially, I had placed my project under wwwroot folder and ran it under IIS and it gave this error. Then I moved it to my local C drive and same thing. I am sharing this project with two other co-workers and all our config files and code files are same...they don't get this error but I do. I checked that SQL Server Client Network Utility has TCP/IP and the 'Named Pipes' enabled. I thought maybe I have setting in the Visual Studio 2005 that I'm not aware of that's causing this problem...it can't be the server since my co-workers aren't having this error and can't be anything in the code since all of us are sharing this project through vss. I dont' think using different version of .net framework can create this error. I changed the version from 2.0 to use 1.1x and it gave same error... Any help would be greatly appreciated. Thanks in advance.
Server Error in '/RBOdev' Application.
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
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: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)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): An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +739123
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) +685966
System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) +109
System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) +383
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +181
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +130
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28
System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
System.Data.SqlClient.SqlConnection.Open() +111
System.Web.DataAccess.SqlConnectionHolder.Open(HttpContext context, Boolean revertImpersonate) +84
System.Web.DataAccess.SqlConnectionHelper.GetConnection(String connectionString, Boolean revertImpersonation) +197
System.Web.UI.WebControls.WebParts.SqlPersonalizationProvider.GetConnectionHolder() +16
System.Web.UI.WebControls.WebParts.SqlPersonalizationProvider.LoadPersonalizationBlobs(WebPartManager webPartManager, String path, String userName, Byte[]& sharedDataBlob, Byte[]& userDataBlob) +195
System.Web.UI.WebControls.WebParts.PersonalizationProvider.LoadPersonalizationState(WebPartManager webPartManager, Boolean ignoreCurrentUser) +95
System.Web.UI.WebControls.WebParts.WebPartPersonalization.Load() +105
System.Web.UI.WebControls.WebParts.WebPartManager.OnInit(EventArgs e) +497
System.Web.UI.Control.InitRecursive(Control namingContainer) +321
System.Web.UI.Control.InitRecursive(Control namingContainer) +198
System.Web.UI.Control.InitRecursive(Control namingContainer) +198
System.Web.UI.Control.InitRecursive(Control namingContainer) +198
System.Web.UI.Control.InitRecursive(Control namingContainer) +198
System.Web.UI.Control.InitRecursive(Control namingContainer) +198
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +692
Version Information: Microsoft .NET Framework Version:2.0.50727.832; ASP.NET Version:2.0.50727.832
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Jul 19, 2007
Hi there,
This is probably a really obvious question but I have been struggling with answering it for about two days now. (I may even be in the wrong forum) I work in a company with an internal network set up. I have been trying to connect to our website via FTP and it has worked ... well it did in the beginning. I think the server that our website is hosted on is a Unix server - this is a guess from reading the FTP transcripts of the various programs I've downloaded and tried out in an attempt to connect to it.
What happened:
I was working on an .ASP page in Dreamweaver, hit save without thinking, realised I wanted to make a few additional changes before uploading it onto the server, cancelled the transaction and voila. I haven't been able to connect to the remote server since.
Depending on the FTP program that I am using, I get a connection error along these lines:
- "Connection to the server was reset" "The server may temporarily be down or unavailable or not accepting connections"
I am a big newbie at this. I have turned off the windows firewall and tried turning on and off passive IP. I can connect from home but not from inside the building which has me think this has to do with a stray setting somewhere. My housemate suggested I try using the "telnet" command from DOS and see can I get any sort of connection from work. If I can't, he said, it's probably a firewall on the internal network itself.
Any other suggestions?
Help would be welcome!
Thanks.
Quizzy
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Jan 24, 2008
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider,
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Apr 10, 2008
Hi,I have SQL Server Express Edition. I tried working out some ASP.NET Labs in my local system. Here is the link of the Virtual Lab which I tried. http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?EventID=1032286906&EventCategory=3&culture=en-US&CountryCode=USI recieve this error in my local system. An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)I tried working out solutions from various websites. But the no solution is effective. Could anyone help me in solving this issue.
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Apr 3, 2008
Hello
I have VS 05 professional connected to SQL server express. I am trying to make a simple console connection to northwind database to show the results of a simple procedure.
The code is as follows:
using System;
using System.Data;
using System.Data.SqlClient;namespace Chapter6
{
class CallSp1
{static void Main()
{
// create connection
SqlConnection conn = new SqlConnection(@"server = .centrinosqlexpress;
integrated security = true;
database = northwind");
try
{
// open connection
conn.Open();
// create command
SqlCommand cmd = conn.CreateCommand();// specify stored procedure to executecmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "sp_select_employees_details";
// execute command
SqlDataReader rdr = cmd.ExecuteReader();
// process the result setwhile (rdr.Read())
{Console.WriteLine("{0} {1} {2}",rdr[0].ToString().PadRight(5),rdr[1].ToString(),rdr[2].ToString());
}
rdr.Close();
}catch (SqlException ex)
{Console.WriteLine(ex.ToString());
}
finally
{
conn.Close();
}
}
}
}
The build indicates no errors but the dos output gives the following error:
Error: System.Data.SqlClient.SqlException: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does notallow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Connect(Boolean& useFailoverPartner, Boolean& failoverDemandDone, String host, String failoverPartner, String protocol, SqlInternalConnectionTds connHandler, Int64 timerExpire, Boolean encrypt, BooleantrustServerCert, Boolean integratedSecurity, SqlConnection owningObject, Boolean aliasLookup) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Chapter10.ConnectionSql.Main(String[] args) in D:PROG_DEVVb.NET_devConsoleAppconnectVerifyAppconnectVerifyAppProgram.cs:line 18Connection closed.Press any key to continue . . .
BOTH THE CLENT AND DATABASE IS ON SAME MACHINE.
THE DATABSE IS centrinosqlexpress as shown in the code.
I
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Dec 9, 2014
we have roughly 22 people connected to one database. But after a while, their applications begin to drag due to in and out communication with the server. When i check the active connections on the sql server, some times i see 157 active connections, please how to i set a timeout or connection interval close, so as reduce the heavy load being put on the server. Or how can i automatically close connections when they get higher than 50 connections.
This settings should be sql server 2008 related.
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Aug 4, 2015
I have a table 'library' with two columns
user_name, access_time
every user is having more than 500 entries, i want to keep only top 50 records for every user and delete the remaining records.
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Jan 28, 2008
Hi I always get good reply from u all, thank you,
I have copied my asp.net website from one server to another. they administrator made necessary modification on IIS manager . and able to see the website on browser. but now i can't loging to system using old password.
I tryed to create new password then also it gives error
System.Data.SqlClient.SqlException: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
Here I have used asp.net login control and membership class. Do I need to make nay changes in code.
I have already modified server name in connection string in web config file.
any one can say what is the problem and how to solve this.
thanks
Pat
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