Max Connections Pool Reached
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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Feb 11, 2004
What does this error message imply?
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Sep 26, 2007
I am working on a large application built on the 1.1 framework in VS2003 (SQL Server 2000 DB) and keep getting 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'.
I can run the app in Debug 10 consecutive times, doing the exact same thing every time, and the error will occur at 10 different points, and 10 different calls to the data-access layer.
There is a data-access layer that is responsible for executing sql statements and stored procs. Every function in the data-access layer handles connections in the following way:
Try ' setup data adapter da.Fill(ds, "ResultSet") Return dsCatch ex As Exception ' send the exception back to the client Throw exFinally ' release objects da.Dispose() conn.Close() : conn.Dispose()End Try
I have read numerous posts about making sure not to leak connections. I have watched the connections within the SQL Activity Monitor and, at the most, there are 5 connections open at any given time. I use the default timeout and pool size values (30 sec. and 100 connections) in my connection strings. I am 99% positive that I am not leaking connections. Are there any other explanations for why this is happening?
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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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Mar 23, 2001
We have been running SQL Server 7 for the past 6 months, with no problems at all. All of a sudden, we have received the error message 17050, that the maximum limit for connections has been reached. We cannot now start Enterprise Manager or do anything. We have tried fiddling with licencing in control panel but to no avail. Does anyone have any idea why this has suddenly happened? Any tips would be great!
Cheers.
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Jul 23, 2005
I'll try and keep this brief so in a nutshell:I have large distributed java system running on a Windows 2003 server(4cpu 8Gb memory).Periodically the following exceptions occurs in the servers:java.net.SocketException: No buffer space available (maximumconnections reached?): recv failedI know for a fact we are not using too many TCPIP sockets or runningtoo many socket servers.I have googled this error and found very little to help me.What buffer space is this?What does recv failed mean?(Is it at all relevant that sql server is running on the same box?)Any advice appreciated.Thanks in advance.Dan
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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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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 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 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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Mar 2, 2000
When attempting to view the articles which belong to a publication the error 823 is raised. The replication is working fine but can the publication can not be altered or deleted. An article in the publication needs to be removed to allow structure change. Any one seen this message before?
Error 823: I/O error 38 (reached end of file) detected during read of BUF pointer=ox1161zcdo page ptr = 0x13a9e000 pageid = (ox1:ox1495a) dbid=7, status=0x801 file d:mssql7datawestdeeping_data.mdf
Any one have any idead on what causes it or how to get around it or prevent it again??
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May 28, 2007
I am trying to setup transactional replication between Server A and Server B. There are 265 databases on each server.
I am running SQL Server 2005 on Windows Server 2003. The problem comes in at the 201st database. The message in the SQL Server Agent Error Log is :
Warning,[398] The job (WSSWPG09-EmpirePaint-WSSWPG06-104) has been queued because the maximum number of working threads (400) are already running. This job will be executed as soon as one of the working thread finishes execution.
SQL Server's max worker threads is set to 0. The Distribution, LogReader and T-SQL subsystems have been increased to 200 max_worker_threads.
Is there some other setting (maybe a Windows Registry setting) that can be configured to fix this? Or have I just hit a physical maximum of the processor?
Any help is much appreciated.
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Jan 11, 2007
Does the user get an error message?
What error does an application get that tries to insert additional data via ODBC?
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Sep 7, 2007
i believe this is the right thread... i recently had an issue where my xpstar.dll would not register and i read to fix the issue to reapply the SP so i installed SP4 i now am getting this error... please help!
2007-09-07 14:24:19.24 server Logging SQL Server messages in file 'C:Program FilesMicrosoft SQL ServerMSSQLlogERRORLOG'.
2007-09-07 14:24:19.24 server SQL Server is starting at priority class 'normal'(4 CPUs detected).
2007-09-07 14:24:19.36 server SQL Server configured for thread mode processing.
2007-09-07 14:24:19.38 server Using dynamic lock allocation. [2500] Lock Blocks, [5000] Lock Owner Blocks.
2007-09-07 14:24:19.40 server Attempting to initialize Distributed Transaction Coordinator.
2007-09-07 14:24:20.44 spid3 Starting up database 'master'.
2007-09-07 14:24:20.49 spid3 Error: 823, Severity: 24, State: 5.
2007-09-07 14:24:20.49 spid3 ReadFileHdr: Operating system error 38(Reached the end of the file.) encountered.
2007-09-07 14:24:20.49 spid3 Error: 5159, Severity: 16, State: 3.
2007-09-07 14:24:20.49 spid3 09/07/07 14:24:20 Stack Overflow Dump not possible - Exception c00000fd E at 0x00449CA1
2007-09-07 14:24:20.49 spid3 Address=449ca1 Exception Code = c00000fd
2007-09-07 14:24:20.49 spid3 eax=ba65a0de ebx=00000002 ecx=42ba8740 edx=0bb0a830
2007-09-07 14:24:20.49 spid3 esi=00000001 edi=42ba8740 eip=00449ca1 esp=0bb09fc4
2007-09-07 14:24:20.49 spid3 ebp=0bb0a56c efl=00010212
2007-09-07 14:24:20.49 spid3 cs=1b ss=23 ds=23 es=23 fs=3b gs=0
2007-09-07 14:24:20.49 spid3 1: Frame: 0BB0A56C Return Address 00449CA1
2007-09-07 14:24:20.49 spid3 2: Frame: 0BB0AD88 Return Address 00449E10
2007-09-07 14:24:20.49 spid3 3: Frame: 0BB0AD9C Return Address 0044A14B
2007-09-07 14:24:20.49 spid3 4: Frame: 0BB0ADAC Return Address 0044A17D
2007-09-07 14:24:20.49 spid3 5: Frame: 0BB0ADF8 Return Address 0044A19B
2007-09-07 14:24:20.49 spid3 6: Frame: 0BB0AE18 Return Address 004CD11C
2007-09-07 14:24:20.49 spid3 7: Frame: 0BB0B2A8 Return Address 005ED83E
2007-09-07 14:24:20.49 spid3 8: Frame: 0BB0B2FC Return Address 00405473
2007-09-07 14:24:20.49 spid3 9: Frame: 0BB0B324 Return Address 00449357
2007-09-07 14:24:20.49 spid3 10: Frame: 0BB0B350 Return Address 00449329
2007-09-07 14:24:20.49 spid3 11: Frame: 0BB0B378 Return Address 00448EE1
2007-09-07 14:24:20.49 spid3 12: Frame: 0BB0B3E0 Return Address 0060CFF5
2007-09-07 14:24:20.49 spid3 13: Frame: 0BB0BC04 Return Address 006D0991
2007-09-07 14:24:20.49 spid3 14: Frame: 0BB0BC18 Return Address 0044A14B
2007-09-07 14:24:20.49 spid3 15: Frame: 0BB0BC28 Return Address 0044A17D
2007-09-07 14:24:20.49 spid3 16: Frame: 0BB0BC74 Return Address 0044A19B
2007-09-07 14:24:20.49 spid3 17: Frame: 0BB0BC94 Return Address 004CD11C
2007-09-07 14:24:20.49 spid3 18: Frame: 0BB0C124 Return Address 005ED83E
2007-09-07 14:24:20.49 spid3 19: Frame: 0BB0C178 Return Address 00405473
2007-09-07 14:24:20.49 spid3 20: Frame: 0BB0C1A0 Return Address 00449357
2007-09-07 14:24:20.49 spid3
2007-09-07 14:24:20.49 spid3 TotalPhysicalMemory = 2146951168, AvailablePhysicalMemory = 1552097280
2007-09-07 14:24:20.49 spid3 AvailableVirtualMemory = 376274944, AvailablePagingFile = 3696713728
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Jul 23, 2005
Hello SQL gurus!I am trying to write a query that will return a set of continguous rowsfrom a table, and limit the number of rows returned when a maximumtotal has been reached by adding a value in one of the columns.For example, the two columns below represent 2 columns in a table.a 2b 2c 2d 3e 4f 5g 5I want to start at, say "c", and return all the rows after it as longas the sum of the numbers in column 2 (starting at "c") don't exceed10. The result I'm after would be thusc 2d 3e 4....because 2 + 3 + 4 = 9 < 10Any ideas? Many thanks.
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Jul 20, 2005
We are running three web sites in a clustered environmentWLBS. The web servers are connected to a Database Serverrunning MS SQL server enterprise edition licensed as perCPU license. The Windows 2000 Advanced Server Licensingmode on all the servers is per SEAT license.Our customers are accessing our web servers and after sometime getting error 500, Maximum concurrent users havereached.We have been told by our software provider that theconnection problem lies with the ADO components whichcommunicating with the SQL server.We have been turning round and round, without any luck.Your help will be highly appreciated.Thanks and best regardsDaveLearning is a Never Ending process*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Apr 3, 2008
Hi all
When i am trying to configure Mirroring .i am getting the below error.
The server network address "TCP://RDEEPA:5022" can not be reached or does not exist. Check the network address name and reissue the command. (Microsoft SQL Server, Error: 1418)
. TCP/IP and Name pipe connection is enabled in both principle and mirror server configuration.
I post the complete error message below ,which is in red
TITLE: Database Properties
------------------------------
An error occurred while starting mirroring.
------------------------------
ADDITIONAL INFORMATION:
Alter failed for Database 'success'. (Microsoft.SqlServer.Smo)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=9.00.1399.00&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Alter+Database&LinkId=20476
------------------------------
An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)
------------------------------
The server network address "TCP://RDEEPA:5022" can not be reached or does not exist. Check the network address name and reissue the command. (Microsoft SQL Server, Error: 1418)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=09.00.1399&EvtSrc=MSSQLServer&EvtID=1418&LinkId=20476
------------------------------
BUTTONS:
OK
------------------------------
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Jun 29, 2015
We have a big software that run a warehouse distribution center, written in .NET Backhand is a SQL Server 2008 R2 STD database.
Now, it seems there is a problem with the sessions not being properly closed after each call to the DB. Here is the message got form SQL:
DESCRIPTION:A new connection was rejected because the maximum number of connections on session ID 57 has been reached. Close an existing connection on this session and retry.
In the .NET code, connection is made with the following code:
If oConn Is Nothing Then oConn = New SqlConnection
If oConn.State = ConnectionState.Open Then oConn.Close()
With oConn
.ConnectionString = "Server=" & Server & ";Database=" & DB & ";User ID=" & User & ";Password=" & Pass & ";Connection Timeout=" & 5 & ";MultipleActiveResultSets=" & True
.Open()
End With
This code is called once, at the opening of the software
StoredProc are call with the code:
Try
oCmd = New SqlCommand
With oCmd
.Connection = oConn
.CommandType = CommandType.StoredProcedure
[Code] .....
So every Command is closed after execution, yet, they stay active in the SQL Server. Is there something I'm missing here?
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Oct 12, 2015
One of our production databases was setup mirroring, log shipping and replication on it, the log file was setup unrestricted growth. This morning one index rebuilding process generated lots of logs, and the log file disk ran out of space, the database was in recovery mode. so we had to disable log shipping, pause mirroring and replication, expand log file disk, restarted SQL instance to fix the issue. Now we want to setup the log file to maximum size 80G, the whole log file disk is 120G.
So if the log file reached 80G next time, we can change the max size to 90G or 100G and it's easier to fix the space issue. My question is, if the database log file reached max size,
1. is the database still available?
2. Will the active session causing the issue be rollback to release space back?
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Aug 5, 2015
I have a simple SP that returns 2 columns with 4 inner joins, results are about 100 odd rows max, nothing complicated. When I run the SP via SSMS it works fine, as soon as this is run via an application server the SP fails to complete with the error :
Internal error: An expression services limit has been reached. Please look for potentially complex expressions in your query, and try to simplify them.
We are not getting anywhere near the expression limit so I cannot understand why we are suddenly receiving this error. 2 weeks ago this query was running fine, no updates have been rolled out to the SQL database servers or application servers but the error is suddenly appearing on both prod and dev environments.
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Jul 13, 2006
1) What is the use of pooling actually?
I have an online application using SQL server, where I can check the connection pool from, SQL Server Enterprise Manager->Microsoft SQL Server->SQL Server Group->LOCAL->Management->Current Activity->Process Info.
2) In the connection pool, when I log into my system, a connection is made as I run query using stored procedure thus making the process available in the connection pool. Now when I am done and log out of the system, does the process suppose to stay there or not (the connection closed) and making it disappear from the pool?
I read from some forum that pooling is a good thing as it make accesing data faster.
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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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Jul 20, 2005
Hello Experts,I make a connection with .Net Sqlclient Data Provider tomy server and I adjust the min pool size = 0, but when Icheck the sysprocesses I see that 2 connections have beenmade. Why is that? am I missing something here?Conn. string"server=MYSERVER;user id=sa;database=MYDB;min poolsize=0;max pool size=10;packet size=3072;ApplicationName=MYAPP"Thanks in advanceMichas KonstantinosSQL Sewrver Developer, DBA*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Sep 8, 2007
I have pages which are using a master page.
An example page on my site would be the homepage, it makes 3 connections to mssql.
1) Get the keywords of the page
2) Get a list of news articles
3) Get the content of the page.
When I visual web express to debug the site it's giving me a pool error message, neither can I get the site to load directly via IIS. It says theres been a pool timeout.
I've read on the internet about making sure connections are closed when you are finished and I've checked that all database connections are closed using
finally{conn.Close();}
does anyone have any idea why I would be having this problem?
How can I see what connections the site is opening, or maybe theres a limit on my server?
I'm using my own test server running windows 2003 and IIS
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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 30, 2004
I have a site which provides online studying for students in a graduate program. Apparently their final was today because lastnight everybody was on. I know, however, that this is a small class, so no more than about 80 people could be on the site at one time. I still got SQL errors (emailed to me from Application_Error). I read on MSDN that by default connection pooling should be in place, with a pool size of 100... that would mean I wouldn't have this problem if only 80 students were on the site.
Why is this happening?
Below is my connection string from web.config.
<add key="connStr" value="Server=xxxxxx;Database=xxxx;UID=xxx;PWD=xxx;"></add>Error:
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.
msdn link: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconconnectionpoolingforsqlservernetdataprovider.asp
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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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Apr 17, 2008
Dear All,
how can i change the default pool size???
Vinod
Even you learn 1%, Learn it with 100% confidence.
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Sep 24, 2007
I am having a puzzling problem with a DTS package in SQL 2000 that uses a combination of "Execute Process Tasks" and "ActiveX Script Tasks." The issue occurs with one of (the second) the ActiveX Script Task. The script invokes a COM object that was written in C#. This COM object connects to the database and writes a record set and then calls a stored procedure.
When I run this step individually, everything works fine. When I run it as part of the package, the record set is being written but the stored procedure is not invoked (SQL Profile confirms this).
I haven't really begun a serious attempt to troubleshoot the problem, though I have played around with the Transactions and OLE DB properties of the DTS Package.
Any suggestions as to why the behavior might be different, or some straightforward tips on troubleshooting would be appreciated. I have access to the COM component source.
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Jan 3, 2008
When using connection string connect to sql server, there is a item max pool size.
The default is 100.
I set it to 500, but still get max pool size is reached and timeout error.
I checked my code and do open and close each connection each time using connection, so should have no memory leak.
What is the maximun value for max pool size? how to calc this size based on the memory used by SQL Server?
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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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