Question About Connection Pool From The Servers Point Of View

Nov 2, 2007

I was wondering if someone could help explaining how the SQL Server handles all incoming connections, I and a friend started a discussion about using the connection pool in ADO.NET or not in a specific case.


Usually when creating like an ASP.NET Page it's recommended to use the connection pool, because it optimizes the performance, by using already created connection, so we don't have to recreate the connection all the time. I have always thought that the connection in the connection pool had an open connection on the server. So 5 connections in the connection pool, would be 5 open connections at the server. But after having the discussion with my friend I am not so sure anymore.


Say that I would create a client application (.NET using ADO.NET) that connects to the database and work with that data. If I then have 1.000 clients and each client have a connection pool with 5 connections in it (I think that the default numbers for the connection pool), then there would be like 5.000 open connections on the SQL Server, where most of the connections actually never do anything more than hanging around and waiting... And then the connectionpool is not 1 per client but 1 per connectionstring.


So if my client scenario would access data from 2 different databases, there would actually be 10.000 open connections at the SQL Server. So now I think that there must be a server connection pool or something to handle the connection from the clients. So that there would only be like 10-50 open connections at the server for the 1.000 Clients that was connected.


How is it? Is there 1 open connection in the server for every connection in the connection pool? If that's the case, it would be better for the SQL Server if I don't not use the connection pool in the client, but instead open the connection when we need it, and then close it, and taking that little performance hit every time, to help the performance on the SQL Server.


Best regards

- Magnus

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System.Web.UI.Control.LoadRecursive() +47
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436

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LogDo.Log_Save(Exception e, String sql) +124
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LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
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LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
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LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
LogDo.Log_Db_Save(String sjm, String k_sql, String bz) +438
LogDo.Log_Save(Exception e, String sql) +124
DataCaoZuo.Manage_ResultTB_Caozuo(String comstr) +145
Cls_UserManage.GetAllUserList() +18
Index.Page_Load(Object sender, EventArgs e) +83
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +34
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +47
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061


Version Information: Microsoft .NET Framework Version:2.0.50727.832; ASP.NET Version:2.0.50727.832

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Hi to everyone,
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