Comments on: SQL Server: Understanding and Controlling Connection-Pooling Fragmentation

By: Mohammed Mawla

Mohammed Mawla — Fri, 14 Oct 2011 01:00:24 +0000

Amit,
The SQLConnection.changedatabase does change database context for an **open connection** , thus the connection initial DB was master so the connection pooling is still for master

Please refer to

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.changedatabase%28v=VS.85%29.aspx

The connection pooler is not influenced by ChangeDatabase as long you do not set Connection Reset to false. As the connection comes out of the pool the connection is reset with the server moving back to the login time database. There are no new connections created or reauthentications. If you set Connection Reset to false, connections in the pool to different databases might result.

By: Amit

Amit — Thu, 13 Oct 2011 05:53:58 +0000

If I use the change database statement of SQL Connection object then for which database the pool wil be maintained ?

For eg: In my connection string I have master database. I have opened the connection for master database, then I am using SQLConnection.changedatabase(“northwind”). Then I am executing query for a table which exists on Northwind.

Please let me know for which the connection pool will be maintained. For master or for Northwind.

By: Hashim Abbas

Hashim Abbas — Fri, 07 Oct 2011 06:41:30 +0000

Excellent information :) (Y)

By: Tiago Sumita

Tiago Sumita — Tue, 05 Jul 2011 15:51:49 +0000

Great article!

By: Mayur

Mayur — Sat, 09 Apr 2011 04:41:58 +0000

I connect SQL server 2008 with Microsoft SQL server Management studio it was connect with using database engine server authentication it was connect. I was use this database connection in local site it was working perfect but when we use this same site online it was some time database connected and sometime not connected.
Please help me to solve this problem..

By: Rasmus Striib

Rasmus Striib — Wed, 02 Feb 2011 13:10:42 +0000

This is a very good explanation of the nature of SQL Server connection pools. Saved me a lot of time. Thanks.

By: Links: 2010-October « Sheen Space

Links: 2010-October « Sheen Space — Fri, 22 Oct 2010 10:34:47 +0000

[...] SQL Server: Understanding and Controlling Connection-Pooling Fragmentation [...]

By: Pooled Connections « Systems Engineering and RDBMS

Pooled Connections « Systems Engineering and RDBMS — Mon, 31 May 2010 17:39:40 +0000

[...] Article at Pythian – excellent article discussing connection pooling – here. [...]

By: Mohammed Mawla

Mohammed Mawla — Tue, 24 Nov 2009 22:30:58 +0000

Hey Vineet,

The blog mentions a scenario of multiple **web** servers and single database server.

In all cases , connection pooling should be enabled even if you use only one application server as it will help somehow.

HTH

By: vineet

vineet — Mon, 23 Nov 2009 06:32:21 +0000

This article is very usefull for me.You have explained alot of abount connection polling.
It give me a greate information.
Thanks a Lot.

But if my application uses only one database server not destributed then whether I should
use Pooling=True Or not?