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Again, quite a bit has been written about connection pooling. This is one of the most common areas of concern, especially for ASP.NET applications, and I ve written my share of articles and blog entries. When you understand how the mechanism works, you ll understand how to keep it working. These are the basic functions: When the SqlConnection.Open method passes a connection string to SqlClient, the provider looks for a matching connection pool. Each pool is uniquely identified by its connection string.
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Each AppDomain or Process gets its own pool. This means other ASP.NET applications get their own pool(s). Each transaction scope gets its own pool. An application can have as many pools as necessary just change the connection string. Since ADO.NET 2.0, developers have been able to clear a specific pool or all pools owned by the AppDomain or Process. When the SqlConnection.Open method is called, either a new pool is created, or an existing pool is reused. If the pool exists, the provider attempts to find and use a dormant (unused) connection in the pool. Otherwise, a new connection to SQL Server is established and its handle is placed in the pool. If a dormant connection is found, the connection state is cleared (by default) so the new owner inherits a clean connection state identical to the state when it was first opened. As more requests for connections are passed to the provider, the process is repeated until the number of pooled connections reaches an upper limit. The default is 100 connections. When the Connection.Close method is called, the connection is marked as dormant and reusable. The connection is then placed in the pool, ready for reuse. No attempt is made to clean out the connection state until the connection is reused. If a connected application fails in a way that forces the connection to be closed, the pooled connection is dropped. In some cases, all connections in the pool are dropped when an error occurs. If the server cannot be accessed for whatever reason or the AppDomain or Process ends, the pool is flushed and dropped. If a pooled connection is not reused after 4 to 8 minutes, it is closed and dropped from the pool until there are Min Pool Size connections left.
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Connection pools are created on the client, not on the server. When debugging applications with Visual Studio, you ll notice that Visual Studio owns the connection pools. This means connections might be held for some time if the application under development does not properly close the connection (as often happens). Eventually, you ll overflow the pool or exhaust the number of connections permitted by the SQL Server configuration.
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As you can see, managing the connection pool can be somewhat complex at least behind the scenes. Typically an active ASP.NET site uses about a dozen connections per pool even those sites that support thousands of users. If you need to adjust the connection pooling mechanism, you can do so using the specific connection string keys, as shown in table 2.
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Table 2 Connection pooling connection string keywords Key name Default Purpose Has no effect on lifetime of dormant pools except for clustered servers. Has no effect on lifetime of dormant pools except for clustered servers.
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Connection Lifetime Load Balance Timeout Max Pool Size
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0 0 100
Specifies the maximum number of connections to be pooled. (If you have to increase this, you re doing something wrong.) Sets the number of connections kept in the pool regardless of age. Enables or disables connection pooling.
Min Pool Size Pooling
0 True
Despite what the documentation says, you can t change the length of time a connection is left in the pool after it s closed. The Connection Lifetime and Load Balance Timeout keys are used only in clustered servers. After a connection is closed by the Connection.Close method, the dormant connection remains aging in the pool (holding its server-side state) for 4 to 8 minutes (the time is chosen randomly). The only way to force the connections to close is to flush the pool or stop the process or AppDomain that owns it.
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