Keep A Few Connections Open All The Time Or Open/close Connections On The Fly?

Jul 20, 2005

Just a quick question about connection management. My application will
never need more than 1 or 2 connections about at any given time. Also, I do
not expect many users to be connected at any given time. For efficiency, I
would like to keep connections alive throughout the lifetime of the objects
requiring them, rather than opening a new connection, executing code and
then closing it again. What is the most efficient way of doing this?
Should I perform the open/close or just one open when I create the object
and a close when I dispose of it?

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No Of Open Connections

Feb 1, 2008

We've built a web site with more than 500,000 unique visitors per month.

We are not having any performance issues.

However, I've asked my ISP to send me the no of open database connections.

He told me that there's around 80 open database connections.

For info, we are using dotnet with DAB 3.0 and SQL server 2005.

Is the no of connections normal ?

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Leave The Connection Open Or Always Open And Close Immediately?

Jun 7, 2006

Hi there,
 
I got an approach like that:
1) Read something from DB - check the value, if true stop if false go on2) Read the second Value (another SQL Statement) - check the value etc.
Now I could open the connection at 1) and if I have to go to 2) I leave the connection open and use the same connection at 2). Is it ok to do that?
The other scenario would be opening a connection at 1), immediately close it after I read the value and open a new connection at 2).
Thanks for the input!

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Reusing Open Connections

Apr 19, 2008

Hi ,
 
       I want to open  and close sql connection only once and want to use in every function without open or close this connection in class file in asp.net 2003 .
    how can it possible .
 

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Feb 1, 2006

How can I know how many connections are open at a given point of time while I am testing an ASP.Net application? The application uses SQL Server 2000 as its database.
 

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Connections Remain Open In SQL Server 6.5...

Feb 19, 1999

Would be very pleased if anyone knows a solution to my prob.

I connect via ODBC (ADO) within Active Server Pages with an SQL Server 6.5 database.
The connection is opened at the top of the pages that need the database, and closed at the end of each individual page. Thing is, the connections for one single user are max. around 3 connections (checked that in Performance Monitor), no matter how many times the user opens his browser with the application. However, when say 20 users log on, the max. number of user connections as configured is reached within no time! The connections are not being closed (even with connection pooling on, they increase like hell!).
The only way to close them seems to be stopping the MSSQLServer service, but that's something ya don't want, of course.

It's jut plain crazy to increase the number of user connections to around 250 for about max. 80 user connections at one time...

I would really appreciate your input.

Thanks in advance!

Best regards,

Wim

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How To Check Number Connections Open

Oct 1, 2007

Hi,

Please, I like to know how can I check what is the number of connections already opened for an specific Database on SQL Server 2005, programmatically.

Thanks in advance.

Ivan

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Trouble With 2 Open Connections Using MultipleActiveResultSets=True

Feb 7, 2008

Hi I'm trying to have 2 datareaders open at the same time with MultipleActiveResultSets=True but still getting an error saying There is already an open DataReader associated with this Command which must be closed first. Do you see what I might be doing wrong? Thanks.
<configuration>  <connectionStrings>    <add connectionString="user id=username;data source=servername;persist security info=True;initial catalog=corporate_mel;password=password;MultipleActiveResultSets=True;" name="corporate_mel" providerName="System.Data.SqlClient" />
 Dim strConnection As String        Dim sqlConn As SqlConnection        strConnection = System.Configuration.ConfigurationManager.ConnectionStrings("corporate_mel").ConnectionString        sqlConn = New SqlConnection(strConnection)        sqlConn.Open()
 
This is the actual code where I'm trying to use 2 datareaders:
 ' Retrieve Data from database based on selections chosen in ListBox
Dim cmdCommittee As New SqlCommand("Select * from committees_tbl where committee_id in" & _
"(" & strCommitteesRemoveLast & ") order by committee_name", sqlConn)

' setup a datareader
Dim drCommittee As SqlDataReader = cmdCommittee.ExecuteReader()


' Loop through datareader and insert rows
' into the xref_person_committees_tbl
While drCommittee.Read()
Dim strCommitteeName As String = drCommittee("committee_name") 'retrieve committee_name from datareader

' Create a sql string
Dim strAddCommittee As String = String.Empty
strAddCommittee = "Insert into xref_person_committees_tbl (committee_name) values ('" & strCommitteeName & "')"
'Response.Write(strAddCommittee & "<br>")

' Create a sql command to process the insert
Dim sqlAddCommittee As New SqlCommand(strAddCommittee, sqlConn)
Dim drNewCommittee As SqlDataReader = sqlAddCommittee.ExecuteReader()


End While 

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Data Driven Subscription - Open Connections

Jul 25, 2007

Hi,

I'm trying to run a data driven subscription on a report in the rs2005,

and using a data source to oracle,

I found out that when the subscription runs it opens a connection to oracle for each report and it means that i have more than fifteen open connections every time which causes a performance problems

did anyone encounter this kind of problem

pls help

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How Many Open Connections Does SQL Server 2005 Express Allow To .mdf File

May 17, 2007

Hi Guys, how many connections does sql 2005 express allow to .mdf file. I stumpled on info on a microsoft site (actually a forum post on msdn) that sql server express allows only a single connection to an .mdf file.
Iam intrested in this because i developed reporting services reports in BIS and iam having problems. If i run a report from report manager, i have to wait for close to 20 minutes before i can be able to run my asp.net application agian. Else if i insert data or retrieve data from my asp.net application, then i have to wait again for 20 minutes or more before i can be able to run my reports else i will get an error that a connection can not be made to the database or that the database is being used by another process.
So in all cases, i have to wait for 20--30 minutes before a connection can be made to the .mdf file. i.e after running a report or after inserting or retrieving data from the database through my asp.net application. 
Iam using sql sever 2005 express with advanced services and visual web developer on windows server 2003. 
Any ideas or help.

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Convert Tick-by-tick Stock Price Time Series Data Grouped As High, Low, Open And Close Prices

Dec 3, 2006

I am working on a stock price analysis project. Stock prices are stored in SQL Server as tick by tick data (that means in a high frequency) and need to be grouped by minutes in order to display them as as high, low, open and close prices in a candlestick or similar chart.

The fields in the table are:

Time (for every stock price tick)
Price (stock price)
Symbol (of the stock)

A sample time series would look like this:

11:45:01 $22.11 MSFT
11:45:02 $22.10 MSFT
11:45:04 $22.25 MSFT
...
...
...
11:45:58 $22.45 MSFT
11:46:03 $22.22 MSFT
11:46:08 $22.25 MSFT
...
...
...
11:46:59 $22.45 MSFT

The result of the SQL query should be:

Symbol Time Open High Low Close
MSFT 11:45 $22.11 $22.45 $22.10 $22.45
MSFT 11:46 $22.22 $22.45 $22.22 $22.45

This is the SQL statement I came up with but obviously doesn't work:

SELECT DATEPART(Minute,Time), MIN(Price), MAX(Price) FROM dbo.TimeSales WHERE Symbol='MSFT' GROUP BY DATEPART(Minute,Time)


I would appreciate any suggestions.

Thank you!


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Jan 14, 2008

Hi everybody,How is it possible to close any open connections from the connection pool explicitly like on the log off page? So when the users log off from the application I want to close all connections that were opened during the use of application.asp.net forums is the best....thanks,Murthy here 

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Why Do My Endpoint Connections Never Close?

Jan 11, 2008

Problem: Connections to SOAP endpoints never close even if app initiating call was shutdown several days earlier. Create Endpoint statement included at bottom

Questions:
1 Why?
2. Is there a configuration option I need to set?

[1] Client side: Multiple clients from XMLSpy running on XP Pro to WebSphere Process Server running on AIX

[2] Server side:


What is the MS SQL version? SQL Server 2005 SP2

What is the SKU of MS SQL? Enterprise

What is the SQL Server Protocol enabled? Shared Memory | and TCPIP

Does the server start successfully? YES
If SQL Server is a named instance, is the SQL browser enabled? YES

What is the account that the SQL Server is running under? Domain Account
Do you make firewall exception for your SQL server TCP port if you want connect remotely through TCP provider? NO

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. NO
[2a] Tool Used to Connect: Multiple clients from XMLSpy running on XP Pro to WebSphere Process Server running on AIX


[3] Platform:

What is the OS version?Windows 2003 SP2
Do you have third party antivirus, anti-spareware software installed? McAfee. Exceptions have been set in accordance with MS SQL Server documentation

ENDPOINT:

CREATE ENDPOINT [TestEndpoint]


AUTHORIZATION [AuthID]

STATE=STARTED

AS HTTP (PATH=N'/SqlSSL/testEndpoint', PORTS = (SSL), AUTHENTICATION = (BASIC),


SITE=N'Win2003.ent.corp.net', SSL_PORT = 443, COMPRESSION=DISABLED)

FOR SOAP (


WEBMETHOD 'PutTestResponse'( NAME=N'[UserDb].[schema].[usp_test]'


, SCHEMA=DEFAULT

, FORMAT=ALL_RESULTS),

BATCHES=DISABLED,

WSDL=N'[master].[sys].[sp_http_generate_wsdl_defaultcomplexorsimple]',

SESSIONS=ENABLED, SESSION_TIMEOUT=10,

DATABASE=N'UserDb',

NAMESPACE=N'http://tempTestEndpoint.org',

SCHEMA=STANDARD, CHARACTER_SET=XML)

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Nov 21, 2007

should u always close everys sqldatasource connection string and the dataset associated with it,
 if so how do u do that (ie the proper way) and is it possible to to do it in the session area of global.aspx, NEt 2.0 or should it be done when exiting the page containing the data stuff,
 also same question for NET 1.0 datasets and adapters and strings,
 

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Close All Existing Connections And Processes To A Database

Jun 4, 2007

Dear all



I created this trigger on a table that i think failed while execution. I tried to modify it and run it again but it seems that i cant do that. If i try and delete the database i also cant - saying that it is still in use. But i am not using it and ther are no other users connected to it. I think the trigger has probably hit a loop and that is holding the link.



To close that i know that a solution would be to restart the SQL server instance but that would be a bit hard since the SQL server where my test database resides is a production server and has few other databases that are important and few users use them.



Is there any way through a SQL statement that there can be forced a delete? Or force close all the connections? Or force close all the processes without actually restarting the SQL server instance.



I have tried all options that were offered on some other forums like forcing it to a single user but even that operation can not be performed saying that the database is still in use.



Thank you so much for all your help and time.



Sincerely

Dan

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Jul 14, 2015

In SQL Server Management Studio, it is possible to do the following:

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b) Use that connection to generate many SQL queries, connected to X, in the right-hand pane.
c) In Object Explorer, connect to a particular SQL Server Database Engine, let's call it Y.
d) Use that connection to generate many SQL queries, connected to Y, in the right-hand pane.
e) Close the connection to X, which was created in step (a), from within Object Explorer.

In the right-hand pane, I am now left with a bunch of queries connected to X, and a similar bunch of queries connected to Y. Any quick way to shut all the queries connected to X, but none of the queries connected to Y?

This question can assume real practical importance if server X is a Live Production Server, and server Y is a Test Server, and my next job of the day is to run a change script against server Y....

I have looked for an option in Management Studio to "Close all queries connected to Server X", but haven't found one.

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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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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)

Apr 18, 2008

Hi ,
      I am struck with one issue.Plz help me out if you have any solution for this one.
Details
Front End - Visual Studio 2005
Back End -SQL Server 2000 (Remote database) 
Error i am getting is
{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)
   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, Boolean trustServerCert, 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 dbcAccess.clsSQL.GetConnect() in C:Documents and SettingskerlsgMy DocumentsVisual Studio 2005ProjectsdbcAccessdbcAccessclsSQL.cs:line 296} 
 
 
 
   
 
{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)

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Apr 6, 2006

Hi All,
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04/05/2006               closed
04/10/2006               open
04/15/2006               closed
Whenever i open and closed the case, one record is insert into the case_status table.
Now I would need to calculate the total days of the case in storeprocedure.
Anyone can help me please.
Aung

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Apr 13, 2008



Just to verify that this was an issue, I downloaded web developer 2008 and I do not experience this same problem.


BUT when I go to add a dataset in vs2005 for an asp website - all my db files come up in the dialogue box but everyone that click (every db file) I get "This file is in use. Please enter a new name or close the file that's open in another program."



But, like I said, I downloaded 2008 and it does not occur. Plus I KNOW that the db's are not being used. Can someone give me a remedy to this?

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Dec 9, 2014

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This settings should be sql server 2008 related.

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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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Aug 13, 2007

Hi All,

I would like to restore database using RESTORE DATABASE ... REPLACE command.
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I would like to close all existing connections to specific database before running RESTORE DATABASE ... REPLACE command.
I can do closing from Management Studio using checkbox "Close Existing Connection" when deleting database. Actually I need to do the same but from script.

Please advice me how to do it.

Thanks in advance,
Roman

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Sep 7, 2007

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Feb 2, 2007

Hi,We have a C# web application that has been running for a few years now with little maintenance.  Over the past few months, we have had some increasing problems.1.  Loses session frequently ~ every 2-3 minutes.2.  Occasionally (every 2 months) get out of memory exceptions.3.  Connections to the DB and therefore the whole site run fast after restart.  Gets continuously slower and slower over time until it starts throwing timeouts: System.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed
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Nov 3, 2014

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May 17, 2005

Hi there,
        Here we have got a
asp.net application that was developed when database was
sitting on SQL server 6.5. Now client has moved all of their databases
to SQL server 2000. When the database was on 6.5 the previous
development team has used oledb connections all over. As the databases
have been moved to SQL server 2000 now i am in process of changing the
database connection part. As part of the process i have a login
authorization code.
Private Function Authenticate(ByVal username As String, ByVal password As String, ByRef results As NorisSetupLib.AuthorizationResult) As Boolean
Dim conn As IDbConnection = GetConnection()
Try
Dim cmd As IDbCommand = conn.CreateCommand()
Dim sql As String = "EDSConfirmUpdate" '"EDSConfirmUpdate""PswdConfirmation"
'Dim cmd As SqlCommand = New SqlCommand("sql", conn)

cmd.CommandText = sql
cmd.CommandType = CommandType.StoredProcedure
NorisHelpers.DBHelpers.AddParam(cmd, "@logon", username)
NorisHelpers.DBHelpers.AddParam(cmd, "@password", password)
conn.Open()
'Get string for return values
Dim ReturnValue As String = cmd.ExecuteScalar.ToString
'Split string into array
Dim Values() As String = ReturnValue.Split(";~".ToCharArray)
'If the return code is CONTINUE, all is well. Otherwise, collect the
'reason why the result failed and let the user know
If Values(0) = "CONTINUE" Then
Return True
Else
results.Result = Values(0)
'Make sure there is a message being returned
If Values.Length > 1 Then
results.Message = Values(2)
End If
Return False
End If
Catch ex As Exception
Throw ex
Finally
If (Not conn Is Nothing AndAlso conn.State = ConnectionState.Open) Then
conn.Close()
End If
End Try
End Function
''' -----------------------------------------------------------------------------
''' <summary>
''' Getting the Connection from the config file
''' </summary>
''' <returns>A connection object</returns>
''' <remarks>
''' This is the same for all of the data classes.
''' Reads a specific
connection string from the web.config file for the service, creates a
connection object and returns it as an IDbConnection.
''' </remarks>
''' -----------------------------------------------------------------------------
Private Function GetConnection() As IDbConnection
'Dim conn As IDbConnection = New System.Data.OleDb.OleDbConnection
Dim conn As IDbConnection = New System.Data.SqlClient.SqlConnection
conn.ConnectionString = NorisHelpers.DBHelpers.GetConnectionString(NorisHelpers.DBHelpers.COMMON)
Return conn
End Function
in the above GetConnection() method i
have commented out the .net dataprovider for oledb and changed it to
.net dataprovider for SQLconnection. this function works fine. But in
the authenticate method above at the line
Dim ReturnValue As String = cmd.ExecuteScalar.ToString

for some reason its throwing the below error.
Run-time exception thrown : System.Data.SqlClient.SqlException - @password is not a parameter for procedure EDSConfirmUpdate.
If i comment out the
Dim conn As IDbConnection = New System.Data.SqlClient.SqlConnection
and uncomment the .net oledb provider,
Dim conn As IDbConnection = New System.Data.OleDb.OleDbConnection
then it works fine.
I also have changed the webconfig file as  below.
<!--<add
key="Common" value='User ID=**secret**;pwd=**secret**;Data
Source="ESMALLDB2K";Initial Catalog=cj_common;Auto
Translate=True;Persist Security Info=False;Provider="SQLOLEDB.1";'
/>-->
<add key="Common" value='User ID=**secret**;pwd=**secret**;Data Source="ESMALLDB2K";Initial Catalog=cj_common;' />
 
Please help. Thanks in advance.
 

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Oct 20, 2007

Hi, I am new to ASP.NET and Visual Web Developer 2005 Express, which I run on Windows Vista. I am currently going through some of the tutorial videos on http://www.asp.net/learn/videos/ . I encountered an error in Lesson 04 and I would have ignored it but it keeps haunting me and now I cannot proceed with the lesson 09 all because of the same error. I would really appreciate it if somebody could help me resolve this because it.
General error text
The database filename can not contain the following 3 characters: [ (open square brace), ] (close square brace) and ' (single quote)
Lesson 4 circumstances


Web.Configis modified to contain the following code just before the closing </system.web> tag:<anonymousIdentification enabled="true"/><profile enabled="true">  <properties>    <add name="MyNewProperty" allowAnonymous="true"/>  </properties></profile>

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Dec 28, 2006

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