Using One Single-application Connection Vs. One Connection For Every Operation To SQL-Server Via ADO.NET
Aug 11, 2005
Dear members,
I'am thinking about the "best" way to connect to my sql-server via
ADO.Net (if there is a best way).
My application uses the sql-server very intensively. At the moment
every database-operation opens a connection, executes and then closes
the connection.
Another way would be to use only a single connection to the database,
which is opened when the application starts.
What do you think is the better way to get a high performing sql
server: using one single application connection vs. using one
connection for every operation?
Cheers, Sebastian
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Nov 30, 2015
My application supports a single database connection and in the app console I can produce reports. If I include the app database in an AlwaysOn availability group with a read-intent replica will SQL automatically route the “selects” to that second instance thus offloading my application’s reporting activities or I need a separate db connection (maybe from a reporting app or cli) with a connection specifying read-only intent?
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Oct 20, 2007
We've been using SQL Server 2005 for a while as the db for our web app. Everything has been working fine, until yesterday when we started getting a "Arithmetic operation resulted in an overflow. (System.Data)" error message when trying to connect from SQL Server Management Studio or from our web app. This only happens when trying to connect remotely, although remote connections have worked for us perfectly in the past. The full error message is reproduced below. Thanks ahead of time for any help. ===================================Cannot connect to serverName===================================Arithmetic operation resulted in an overflow. (System.Data)------------------------------Program Location: at System.Data.SqlClient.TdsParser.ConsumePreLoginHandshake(Boolean encrypt, Boolean trustServerCert, Boolean& marsCapable) at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) 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.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) 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 Microsoft.SqlServer.Management.UI.VSIntegration.ObjectExplorer.ObjectExplorer.ValidateConnection(UIConnectionInfo ci, IServerType server) at Microsoft.SqlServer.Management.UI.ConnectionDlg.Connector.ConnectionThreadUser()
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Jun 28, 2007
Hey anyone,
I got a problem to check a connection whether it is established or not from my C# Application to SQL Server.
I am developing my application which can run in 2 modes:
1. Online: There must be a connection to SQL Server to get new data updates.
2. Offline: I dont need a connection to SQL Server. I set a timer to tick every 5 seconds and it will check the connection with SQL Server and my problem here: (this is my code)1 public static bool checkConnection()
2 {
3 SqlConnection conn = new SqlConnection("mydatasource");
4 try
5 {
6 conn.Open();
7 return true;
8 }
9 catch (Exception ex) { return false; }
10 }
Yes, it works but my application seems to wait about >3 seconds to get the return "False"; I tried to add "Connect TimeOut=1" in my Connection String, but the problem is still there.
I dont know whether there is a faster way to check the connection to SQL server which is established or not.
Thank you very much,
Joesy
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Jun 11, 2008
I have application that is connecting to SQL Server and runs bunch of stored procedures, but I don't think that am able to connect to my database server. When it hits the line to execute the stored procedure it comes up with syntax error saying the syntax error is at the stored procedure. I know how to set up the connection string with web app from the web config, but never done it on an app. Here is the connection string pointing to my server which I pass to my SqlConnection object: "Data Source=ServerXXXX;Initial Catalog=DB;Integrated Security=True; User ID=xxxx; Password=xxxx;" And that is the code that is using the above connection string: Public Sub MigrateNFSData(ByVal calcTbl As DataTable, ByVal strDBConnection As String) Dim sqlServerConn As New SqlConnection(strDBConnection) 'Define stored procedures Dim command As New SqlCommand Dim getAccID As New SqlCommand("GetAccountID", sqlServerConn) Dim getActionID As New SqlCommand("GetActionID", sqlServerConn) Dim getExchangeID As New SqlCommand("GetExchangeID", sqlServerConn) 'Dim getParrentAccID As New SqlCommand("GetParentAccID", sqlServerConn) Dim getStatusID As New SqlCommand("GetStatusID", sqlServerConn) Dim getTraderID As New SqlCommand("GetTraderID", sqlServerConn) Dim getGroupID As New SqlCommand("GetGroupID", sqlServerConn) 'Define insert records stored procedures Dim insertAcc As New SqlCommand("InsertAccount", sqlServerConn) Dim insertAction As New SqlCommand("InsertAction", sqlServerConn) Dim insertExchange As New SqlCommand("InsertExchange", sqlServerConn) Dim insertGroup As New SqlCommand("InsertGroup", sqlServerConn) Dim insertStatus As New SqlCommand("InsertStatus", sqlServerConn) Dim insertTrader As New SqlCommand("InsertTrader", sqlServerConn) Try sqlServerConn.Open() Catch ex As Exception 'Exception message goes here End Try 'Set parameters to helper Get Stored Procedures to retreive Id's getAccID.Parameters.Add("@AccName", SqlDbType.NVarChar) getAccID.CommandType = CommandType.StoredProcedure getActionID.Parameters.Add("@ActionName", SqlDbType.NVarChar) getActionID.CommandType = CommandType.StoredProcedure getExchangeID.Parameters.Add("@ExchName", SqlDbType.NVarChar) getExchangeID.CommandType = CommandType.StoredProcedure 'getParrentAccID.Parameters.Add("@ParentName", SqlDbType.NVarChar) 'getParrentAccID.CommandType = CommandType.StoredProcedure getStatusID.Parameters.Add("@StatusName", SqlDbType.NVarChar) getStatusID.CommandType = CommandType.StoredProcedure getTraderID.Parameters.Add("@TraderName", SqlDbType.NVarChar) getTraderID.CommandType = CommandType.StoredProcedure getGroupID.Parameters.Add("@GroupName", SqlDbType.NVarChar) getGroupID.CommandType = CommandType.StoredProcedure command = New SqlCommand("InsertTradeTransaction", sqlServerConn) command.CommandType = CommandType.StoredProcedure 'Set Parameters for Insert stored procedures insertAcc.Parameters.Add("@Account", SqlDbType.Text) insertAction.Parameters.Add("@ActionName", SqlDbType.Text) insertExchange.Parameters.Add("@Exchange", SqlDbType.Text) insertGroup.Parameters.Add("@Group", SqlDbType.Text) insertGroup.Parameters.Add("@ACCID", SqlDbType.Int) insertStatus.Parameters.Add("@StatusName", SqlDbType.Text) insertTrader.Parameters.Add("@Group", SqlDbType.UniqueIdentifier) insertTrader.Parameters.Add("@IP", SqlDbType.Text) insertTrader.Parameters.Add("@TraderName", SqlDbType.Text) 'Adding stored Get Stored Procedure's parameters----------------------- command.Parameters.Add("@OrderNum", SqlDbType.Text) command.Parameters.Add("@ACC_ID", SqlDbType.Int) command.Parameters.Add("@Group_ID", SqlDbType.UniqueIdentifier) command.Parameters.Add("@Trader_ID", SqlDbType.UniqueIdentifier) command.Parameters.Add("@Exch_ID", SqlDbType.Int) command.Parameters.Add("@Date", SqlDbType.DateTime) command.Parameters.Add("@Time", SqlDbType.DateTime) command.Parameters.Add("@ActionID", SqlDbType.Int) command.Parameters.Add("@StatusID", SqlDbType.Int) command.Parameters.Add("@TimeSent", SqlDbType.DateTime) command.Parameters.Add("@Qty", SqlDbType.Int) command.Parameters.Add("@Product", SqlDbType.Text) command.Parameters.Add("@MMYYY", SqlDbType.Text) command.Parameters.Add("@ExchOrderID", SqlDbType.Text) command.Parameters.Add("@TimeTicks", SqlDbType.Int) command.Parameters.Add("@W2G", SqlDbType.Int) command.Parameters.Add("@W2Exch", SqlDbType.Int) command.Parameters.Add("@G2ExchDerived", SqlDbType.Int) command.Parameters.Add("@ExchDate", SqlDbType.DateTime) 'command.Parameters.Add("@ParentID", SqlDbType.Int) 'Paremeters Defenition-------------------------------------- 'Write table with computed NFS data to sql server DB For Each dr As DataRow In calcTbl.Rows command.Parameters("@OrderNum").Value = dr.Item("OrderNo").ToString() getAccID.Parameters("@AccName").Value = dr.Item("Acct").ToString() If getAccID.ExecuteScalar() = 0 Then insertAcc.Parameters("@Account").Value = dr.Item("Acct").ToString() insertAcc.ExecuteNonQuery() //THIS IS WHERE IT FAILS and pops up with the message that there is syntax error at this procedure getAccID.Parameters("@AccName").Value = dr.Item("Acct").ToString() command.Parameters("@AccName").Value = getAccID.ExecuteScalar() Else command.Parameters("@ACC_ID").Value = getAccID.ExecuteScalar() End If getGroupID.Parameters("@GroupName").Value = dr.Item("GroupID").ToString() Try command.Parameters("@Group_ID").Value = getGroupID.ExecuteScalar() Catch ex As Exception 'Insert new Account if given account not being found from get stored procedure End Try getTraderID.Parameters("@TraderName").Value = dr.Item("TrdID").ToString() Try command.Parameters("@Trader_ID").Value = getTraderID.ExecuteScalar() Catch ex As Exception 'Insert new Account if given account not being found from get stored procedure End Try getExchangeID.Parameters("@ExchName").Value = dr.Item("Exch").ToString() Try command.Parameters("@Exch_ID").Value = getExchangeID.ExecuteScalar() Catch ex As Exception 'Insert new Account if given account not being found from get stored procedure End Try getActionID.Parameters("@ActionName").Value = dr.Item("Action").ToString() Try command.Parameters("@ActionID").Value = getActionID.ExecuteScalar() Catch ex As Exception 'Insert new Account if given account not being found from get stored procedure End Try getStatusID.Parameters("@StatusName").Value = dr.Item("Status").ToString() Try command.Parameters("@StatusID").Value = getStatusID.ExecuteScalar() Catch ex As Exception 'Insert new Account if given account not being found from get stored procedure End Try 'getParrentAccID.Parameters("@ParentName").Value = "" 'Try 'command.Parameters("@ParentID").Value = getParrentAccID.ExecuteScalar() ' Catch ex As Exception 'End Try command.Parameters("@Date").Value = DateTime.Parse(dr.Item("Exch Date").ToString()) command.Parameters("@Time").Value = DateTime.Parse(dr.Item("Time").ToString()) command.Parameters("@TimeSent").Value = DateTime.Parse(dr.Item("Time Sent").ToString()) If (dr.Item("Qty").Equals(System.DBNull.Value)) Then command.Parameters("@Qty").Value = System.DBNull.Value Else command.Parameters("@Qty").Value = Int32.Parse(dr.Item("Qty").ToString()) End If command.Parameters("@Product").Value = dr.Item("Product").ToString() command.Parameters("@MMYYY").Value = dr.Item("MMYYYY").ToString() command.Parameters("@ExchOrderID").Value = dr.Item("ExchOrderID").ToString() If (dr.Item("TimeTicks").Equals(System.DBNull.Value)) Then command.Parameters("@TimeTicks").Value = System.DBNull.Value Else command.Parameters("@TimeTicks").Value = Int32.Parse(dr.Item("TimeTicks").ToString()) End If command.Parameters("@ExchDate").Value = Date.Parse(dr.Item("Exch Date").ToString()) command.Parameters("@W2G").Value = 2 command.Parameters("@W2Exch").Value = 2 command.Parameters("@G2ExchDerived").Value = 2 command.ExecuteNonQuery() sqlServerConn.Close() Next End Sub Thank you guys as always being helpful.
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Mar 20, 2008
I have VB6 application on several desktops connected to SERVER A (SQL Server 2005) in TESTING. I know I can change some registry values in VB6 application to connect it to SERVER B(SQL Server 20050 in PRODUCTION.
but it is work on each and every desktop.
Is there any way to do something on SQL Server 2005 Engine end (like Alias) so I don't have to make changes for SERVER Redirection in each and every Desktop machine(client), and Just I make change on SERVER Side.
any help or idea on that?
Thanks,
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Apr 21, 2008
Hi all,
I think I can do this, just want to check
Can I have an sql server database (mdf file) on a server and allow windows applications at different site manipulate the database.
As far as I am concerned the only thing that needs to be configued is the connection string..is this correct.
[i would rather use windows applications rather than asp pages]
If I can, the best way to manipulate the database is to use stored procedures. How would I do the following to create and execute the following proposed procedure:
Insert data into a table
Update another table as a result
Execute the store procedure on a form to execute these two statements
Thanks in advance
Peter
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Jun 5, 2007
All:
I am writing an Internet/Extranet based (ASP.Net 2.0) web application that uses SQL server 2005 as the database. I am using forms authentication on my web application. I am also storing the connection string to SQL server in my web config file. The conn string is encrypted using DPAPI with entropy. I currently have created a SQL login account on my SQL server for use by the web application. This is the user ID I am using in my conn string. The reason for this is because all persons using the application will NOT have a windows login.
Here is my question: The login I created currently has defaulted to the "dbo" role and therefore has "dbo" rights to the database. I want to setup up this login account so that all it can do is execute stored procedures. I dont want this SQL login to be able to do anything else. In my application I am using stored procedures for ALL data access functions, via a data access layer in my application. Can someone guide me step by step as to how to setup this type of access for this SQL login.
Thanks,
Blue.
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Aug 2, 2006
Hi,I have a problem, when I want to access to my SQL Server Expressdatabase from my ASP.NET application.My workstation ID is KITOLAP-HPMy username is user01Now I built the following connection String (VB.NET):Dim workstation As String =System.Environment.GetEnvironmentVariable("computername")connectionString = "workstation id=""" & workstation & """;packetsize=4096;user id=user01;integrated security=SSPI;data source=""" &workstation & "SQLExpress"";persist security info=True;initialcatalog=webshop"connection = New SqlConnection(connectionString)Although I put as user id "user01" the application makes an error whenI try to open the connection, saying that the login with user "aspnet"failed.How can I change it so that as login-user "user01" is taken and not"aspnet" or otherwise, how can I create a new user in the SQL Serverdatabase with which I could access the DB??thanks,kito
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Dec 25, 2007
Hi!!
I'moving my asp application to a new hosting server.
So when i tried the setup locally with the live DB & application in my test machine...
The DB access is denied when application tries to hit the DB.
DB is in seperate machine with SQL Server 2000 & application(ASP) is in Windows server 2003.....
Kindly help me with your suggestions....on what went wrong?
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Feb 7, 2008
suddenly I'm getting a connect to server error dialogue box that says...
Cannot connect to serverinstance name
Additional information
The operation could not be completed. (WinMgmt)
...when trying to connect to RS2005 Server in Management Studio. I can reach Reporting Manager thru IE and run my reports.
Is it possible that my setting IIS to basic authentication (and turning off Windows Integrated) might be preventing me from connecting in MS, perhaps because MS has to go thru the RS service and doesnt know what basic auth is?
I'm temporarily unable to set IIS back to Windows Auth cuz the server is being used by users to test reports.
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Feb 10, 2008
We have a nagging issue here in our application side, which I was trying to troubleshoot and reach no where. Can I have your valuable inputs for resolving/understanding the root cause of the issue?
3709-The connection cannot be used to perform this operation. It is either closed or invalid in this context
This error is not coming regularly (twice it happened and after the program is running successfully with out any problem). Problem having exe is running every 2 minutes interval.
Most of the sites saying this is something related to code written in the application but if that is the case why this error is not happening continuously? The problem having exe is running past 4 months with 2 minutes interval and suddenly thrown this error.
I found one MS site describing about this error but not able to find any fixes for this issue (http://support.microsoft.com/kb/839428). We are on the process of upgrading the operating system with SP2; will this help us to resolve this issue? Please advice.
Details
1. Windows 2003 with SP1
2. MDAC 2.8
3. SQL 2005 with SP1
4. VB Application.
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May 5, 2006
Hi All,
I've developed an application that connects to a SQL Server 2005 Express database. I created a DSN to connect to the database through ODBC. Currently, I am testing locally and everything works fine.
I would now like to install my application on another workstation and connect remotely to the database located on my development machine.
The client workstation does not have SQL Server 2005 Express installed on it because I would just like my application to connect remotely by creating the DSN and using ODBC. What I'm missing here are the database drivers. The "SQL Natice Client" is not available on this client workstation. How can I deploy the necessary drivers with my installation file so that I may create the required DSN name using the SQL Native Client driver?
Thanks!
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Jan 30, 2015
I am trying to create a logon trigger. As I am testing this, I discovered that each time I do a connection, I get 19 rows, inserted into my audit table. I ran profiler, and I see it is going through the logon trigger multiple times, for a single connection. So, what am I doing wrong? The code is fairly simplistic, and the profiler doesn't give a clue, as to what is going on. When I look at the output, I see the spid for the first couple of connections are different, then a spid, that is different from those 2 is in the next 17 rows. But, when I do an sp_who2, that spid does not exist.
This issue was noticed on a 2012 version, that I was first testing on, then had the same issue on a 2008 R2. I am currently testing on a 2014 version, that is doing the same thing. Is the logon trigger itself, firing, and causing this?
I also tried using the After Logon option, and got the same issue.
Here is the code:
CREATE TRIGGER LogonAuditTrigger
ON ALL SERVER WITH EXECUTE AS 'sa'
FOR LOGON
AS
BEGIN
DECLARE @Body NVARCHAR(2000),
[code]....
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Aug 23, 2006
I added a connection (ADO.NET) object by name testCon in the connection manager - I wanted to programmatically supply the connection string. So I used the "Expressions" property of the connection object and set the connectionstring to one DTS variable. The idea is to supply the connection string value to the variable - so that the connection object uses my connection string.
Then I added a "Backup Database Task" to my package with the name BkpTask. Now whenever I try to set the connection property of BkpTask to the testCon connection object, by typing testCon, it automatically gets cleared. I am not able to set the connection value.
Then after spending several hours I found that this is because I have customized the connection string in testCon. If I don't customize the connection string, I am able to enter the "testCon" value in the connection property of the BkpTask.
Is this an intrinsic issue?
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Feb 6, 2008
I have a package that uses a for loop to iterate through an unknown amount of excel files and pull their data into a table. However, there will be cases when the file is corrupted or has some sort of problem so that either the transformation will fail or the excel data source will fail with an oledb connection error.
Could anyone suggest a clean way to trap these errors? Specifically, the "Cannot Aquire Connection from Connection Manager", which is the excel connection.
Thanks,
John T
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Mar 9, 2007
All --
Please help.
I have some questions about connection strings.
BACKGROUND...
Note that I am using the "SQL Native Client OLE DB Provider", SQL Sever 2005 Express, ASP.NET, C#.NET, and VS.NET 2005.
Note that I do not want to use the "Attach a database file" type of connection string.
Note that I am using the site http://www.ConnectionStrings.com as a reference.
Note that this "Standard security" connection string...<add name="LocalSqlServer" connectionString="Server=MYTESTOFFICESERVERS;Database=MyDatabase;Uid=MyDatabaseUser;Pwd=MyDatabasePassword;" />...does not work and causes the following run-time error...A connection was successfully established with the server, but then an error occurred during the login process. (provider: Shared Memory Provider, error: 0 - No process is on the other end of the pipe.)
Note that this "Trusted connection" connection string...<add name="LocalSqlServer" connectionString="Server=MYTESTOFFICESERVERS;Database=MyDatabase;Trusted_Connection=yes;" />...works but is less-than ideal because it uses a Trusted Connection rather than a Username/Password combination.
QUESTIONS...
(A) What exactly does the error in Item 4 mean?
(B) Do 4 and 5 imply that one must use a Trusted_Connection for all SQL Server 2005 Express connection strings when the database does not reside in the web application's App_Data folder or use a "Attach a database file" type of connection string?
(C) Are there any alternatives?
(D) What do you suggest?
Please advise.
Thank you.
-- Mark Kamoski
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Jul 10, 2007
When using jdbc with IntegratedSecurity, I run into this problem when the machine is not part of a domain & gets its IP address via dhcp. Is this expected behavior or a bug in the jdbc driver.
The SQLServer and client application are installed on the same machine and a local admin is logged in, running the client app.
If I change one of the two parameters mentioned above, the connection can be established leading me to believe this may be intentional for security issues. Am I correct?
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Aug 30, 2006
When I create a new odbc connection to a SQL server 2005 Db I get a failure telling me dat de SQL server does not allow remote connections.
How can I allow the server to allow this.
Any help appreciated
regards
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Feb 15, 2008
I created a single step plan that does integrity checks. It fails with the error below. I created a new connection using our clusters virtual sql name.
Executed as user: ACCTCOMsqlagent. ...n 9.00.3042.00 for 64-bit Copyright (C) Microsoft Corp 1984-2005. All rights reserved. Started: 1:10:06 PM Error: 2008-02-15 13:10:49.02 Code: 0xC00291EC Source: {0CF32F3D-A8D1-492A-9C0F-AD4E0FC67D14} Execute SQL Task Description: Failed to acquire connection "Local server connection". Connection may not be configured correctly or you may not have the right permissions on this connection. End Error Warning: 2008-02-15 13:10:49.02 Code: 0x80019002 Source: OnPreExecute Description: SSIS Warning Code DTS_W_MAXIMUMERRORCOUNTREACHED. The Execution method succeeded, but the number of errors raised (1) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors. End Warning Error: 2008-02-15 13:11:31.26 Code: 0xC0024104 Source: Check Database Integrity Ta... The package execution fa... The step failed.
The agent and db are running under domain accounts and the job is owned by sa.
Thanks for your help.
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Jun 22, 2006
I have a Rounding error: Between flat file connection manager Source & OLE DB Connection Destination (SQL Server 2005) in my Dataflow.
File looks like this lets call column names Col A,B,C,D
70410000 RD1 1223631.92 196042.42
70329000 ICD 11025.84 3353.88
71167300 COL 104270.59 24676.96
flat file connection manager settings: first row Column names then Advanced tab Col A float , Col B float , Col C string ,Col D float ,
OLE DB Connection Destination (SQL Server 2005)
CREATE TABLE [dbo].[PT_CUST_ABR](
[PARTY_NO] [float] NULL,
[PARTY_NAME] [varchar](75) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[TELECOMABR] [float] NULL,
[GENIABR] [float] NULL,
Problem: ColA (Source) Rounding error to PARTY_NO (Destination)
I have a field of text of in a flat file that the flat file connection manager Source picks up correctly 70000893?
However when it gets the OLE DB Connection Destination the data has changed to 70000896. Thats before its even Written to the database.
The only clue that something is wrong in the middle is the great Data viewer shows the number as 7.000009E+07
Other clues looking at the data it appears there is a rounding error on only the number that dont end in 00
ColA (Source) PARTY_NO (Destination)
71167300 71167296
70329000 70329000
70410000 70410000
Any ideas people?
Thanks in advance
Dave
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Apr 2, 2008
Let me set the stage of my testbed configuration: On Windows XP SP2, my default connection to the Internet is via wireless express card modem using EV-DO via Verizon Wireless. Let's call this connection A. I also have a traditional wireless network connection (802.11g) that is always enabled. Let's call this connection B. Connection A is always connected during normal business hours. Connection B is not and is often searching for a wireless network to connect to when nothing is in range.
Yesterday, connection B was continuously trying to connect to a wireless network not under my control, meaning that the connection was never established and notification messages continually popped up to complain of this fact. Over time, I've learned to ignore these messages and go on doing my daily work without much thought of the possible implications.
Then, things started to get odd. I was running our application, WebWatchBot, to perform some simple tests of various websites and servers, when I started to get messages from the application that database connectivity was lost, which is a message that pops up to inform the user that the connection is forcibly dropped by SQL Server. After a few moments, the connection to the database was re-established and the message went away. Since I was actually working with SQL Server, I thought it was an anomoly, so I continued on. Then, it happened again. And again. Then, I noticed that the "database connectivity lost" message started to coincide with the wireless connection's (connection B) inability to connect with a wireless network.
Why would this be happening? The database and application are on the same exact computer. The connection to the database is via ODBC drivers over tcp/ip, but why would connection B affect this?
Some added information that may prove useful:
Client side:
What is the connection string in you app or DSN? (please specify)
DRIVER=SQL Server;SERVER=HIGHNOTEWEBWATCHBOT;Database=WebWatchBot;UID=sa;PWD=*****
If client fails to connect, what is the client error messages? (please specify)
[Microsoft][ODBC SQL Server Driver]Communication link failure
Is the client remote or local to the SQL server machine? [Remote | Local]
Can you ping your server? [YES | NO ]
In cmd.exe console, type ping -a <server_name>?.
Can you telnet to your SQL Server? [YES | NO, please specify the error message ]
In cmd.exe console, type telnet <server name> port, where port can be 135, 445 or sql_server_tcp_port. If your cmd.exe console turns into a complete black screen with a cursor flushing on top left corner, you are connected. Type ctrl+[ to bring up telnet prompt and type quit? <enter>.
What is your client database provider? [SNAC | MDAC | ADO.NET1.0 | ADO.NET2.0| other (please specify] Or/And, what is your client application? [SQL Management Studio | SQL Profiler | Visual Studio | Other (please specify): WebWatchBot - Website and Server Monitoring Software
Is your client computer in the same domain as the Server computer? (Same domain | Different domains | WorkGroup)
What protocol the client enabled? [Shared Memory | TCPIP | Named Pipes].
Do you have aliases configured that match the server name portion of your connection string? NO
Do you select force encryption on server and/or client? NO
[2] Server side:
What is the MS SQL version? [ SQL Server 2005 | SQL Sever 2005 ]
What is the SKU of MS SQL? [Enterprise | Standard | Workgroup | Express (or MSDE) | other (please specify)].
Microsoft SQL Server Management Studio 9.00.3042.00
Microsoft Analysis Services Client Tools 2005.090.3042.00
Microsoft Data Access Components (MDAC) 2000.085.1117.00 (xpsp_sp2_rtm.040803-2158)
Microsoft MSXML 2.6 3.0 4.0 5.0 6.0
Microsoft Internet Explorer 7.0.5730.11
Microsoft .NET Framework 2.0.50727.832
Operating System 5.1.2600
What is the SQL Server Protocol enabled? [Shared Memory | TCPIP | Named Pipes ]. Use SQL Server Configuration Manager to configure it and check ERRORLOG or event log to confirm.
Does the server start successfully? [YES | NO] If not what is the error messages in the SQL server ERRORLOG?
If SQL Server is a named instance, is the SQL browser enabled? [YES | NO]
What is the account that the SQL Server is running under?[Local System | Network Service | Domain Account]
Do you make firewall exception for your SQL server TCP port if you want connect remotely through TCP provider? [YES | NO | not applicable]
Do you make firewall exception for SQL Browser UDP port 1434? In SQL2000, you still need to make firewall exception for UDP port 1434 in order to support named instance.[YES | NO | not applicable ]
[2a] Tool Used to Connect
What tool or Application are you using to connect to SQL Server (eg: Visual Studio, SQL Server Management Studio, SQLCmd.exe, OSQL, etc) and especially the version of SQL Server (Express, Workgroup, Standard, Enterprise, Developer)
[3] Platform:
What is the OS version? [Windows XPSP2 | Windows 2003 | Windows 2000 | Windows 98 | others (please specify ) ].
Do you have third party antivirus, anti-spareware software installed? [Symantec | Norton | other (please specify)].
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May 15, 2008
hi
i m making a win application
for which i have used sql server 2005 .i faced a very big problem that i have made the database but i cannot able to connect the database with winn application .for this purpose i ned coding.so please help me.i need your help urgent.
sheraz
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May 9, 2006
Our company is using a development tool named eDeveloper.
This tool comes with a gateway for SQL 7.0
Since we upgraded to SQL 2005 the connection is limited to a single connection
Are there any setting that related to the number or type of connetctions for backward compatibility? (I have no problem openning multiple connection using VS 2005)
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Feb 19, 2015
I have a child package where the ConnectionString property of a Connection Manager is set by a Parent Package Variable Configuration. I set up a script task that brings up a message box with the value of the ConnectionString property right before the dataflow task.
MessageBox.Show(Dts.Connections["CPU_*"].ConnectionString.ToString());When I run the parent package, the message box shows that the connection string is changing with every iteration, but in the dataflow it always draws the data from the same source.
The connection manager is an ADO.Net type, RetainSameConnection is set to False, and I've been researching this for days.
(Update 2/23/2015): To make this stranger, when I look at the diagnostic logs, they tell me that when the new connections are being opened they are using the new connection strings.
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Sep 27, 2007
In my asp.net application , I have to open/close SQL databse connection many time, and I dont want to declare Following variable everytime I open SQL database connection
Dim cntec As New SqlClient.SqlConnection(cnStrtec)
Dim datec As New SqlClient.SqlDataAdapter
Dim dstec As New DataSet
Dim cmdtec As New SqlClient.SqlCommand
so do I decalre above variable in module.vb as Public variable or is there any other way to do this.
Please some one give me idea how to do this
thank you
maxmax
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Sep 27, 2007
In my asp.net application , I have to open/close SQL databse connection many time, and I dont want to declare Following variable everytime I open SQL database connection
Dim cntec As New SqlClient.SqlConnection(cnStrtec)
Dim datec As New SqlClient.SqlDataAdapter
Dim dstec As New DataSet
Dim cmdtec As New SqlClient.SqlCommand
so do I decalre above variable in module.vb as Public variable or is there any other way to do this.
Please some one give me idea how to do this
Please give me some examples
thank you
maxmax
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Nov 12, 2007
Hi there,
Has anyone ever encountered problems making .Net applications connect to a SQL database on SQL 2000 with SP3a?
It's running on a virtual machine with a Windows Server 2000 Std with SP4, the .Net application is working with .Net Framework 1.1.4322.573. For some reason it can't connect to the SQL database using the specified username and password in the web.config file even though the user exists in the SQL database. I've tried using the SA password but this still doesn't work. I can logon to SQL Query Analyzer using the SA password but not using the other username.
The .Net application does work on other systems of mine all of which can run on Windows Server 2000 and 2003, I have compared them but can't find any differences.
Any ideas anybody?
Thanks,
Chris
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Nov 24, 2003
Hello,
I was wondering if someone could help me answer this question.
If I had a site like Yahoo, that constantly had users accessing it. Would it be a good or bad idea to automatically open a database connection to SQL Server on Application Start? What would you recommend? Would opening and closing the DB connection on every page save alot of overhead and bottleneck? Thank You.
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Sep 6, 2007
Hi,
I'm testing the use of application roles for security. The customer I work for has still a lot of ASP intranet applications running. We're migrating the databases to a SQL Server 2005 server.
I've changed the connection string to a user without any permissions but to log on. After that I use an application role for permission to select different tables and to execute Stored Procedures.
The first queries do execute but after that I get "Permission denied", like I haven't got the application role anymore.
Any ideas?
Adrian
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Jul 23, 2005
Is there a way that SQL can automatically look at each users'connection and make sure it is still connected through the third partyapplication? The problem is that when a connection to this applicationis not terminated properly, the SQL server is not notified of thedisconnect and the user cannot log back into the application until allthe processes are completed and the original session terminated.Thank you.
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Jun 30, 2015
The application server gets below error while the job is being run intermittently:
An error occurred while performing connection management
com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed.
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:171)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.checkClosed(SQLServerConnection.java:319)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.prepareStatement(SQLServerConnection.java:1839)
[Code] ....
There is no error reported in SQL logs.
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Mar 30, 2008
I am getting this error
"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)(Microsoft SQL Server,Error:2)"
in SQL EXPRESS 2005
1.Just changing the service config settings that is TCP/IP to enable will it work?i changed i run my application but it didn't work they have written the code to the server(connection string to their server- if it was to common how to write the code ?) & is there any other changes ?
2.I have developed a VB.NET EXE file -In that application(inside the code) i am using run time connection string queries to connect to the sql server database & created run time tables.
Suppose if i want to install the application to all clients/users how to Configure that application - self configuration/self installer to the installing machine SQL SERVER.
How can i do this ?
3.Is there any way i can write config file for sql server along with exe application code ? How can i do this ?
Pls answer with details/screenshots or diagramatical (if possible)
pls reply asap
Dotnetnewbie
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