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    <p>It can stay open while connection pooling applies. Example: command timeout can leave locks and TXN because the client sends as "abort".</p> <p>2 solutions:</p> <ul> <li><p>Test in the client, literally:</p> <p><code>IF @@TRANCOUNT &lt;&gt; 0 ROLLBACK TRAN</code></p></li> <li><p>Use <code>SET XACT_ABORT ON</code> to ensured a TXN is cleaned up: <a href="https://stackoverflow.com/questions/1150032/what-is-the-benefit-of-using-set-xactabort-on-in-a-stored-procedure">Question 1</a> and <a href="https://stackoverflow.com/questions/917773/do-i-really-need-to-use-set-xactabort-on">Question 2</a></p></li> </ul> <p>I always use <code>SET XACT_ABORT ON</code>.</p> <p>From <a href="http://weblogs.sqlteam.com/dang/archive/2007/10/20.aspx" rel="nofollow noreferrer">this SQL Team blog</a>:</p> <blockquote> <p>Note that with connection pooling, simply closing the connection without a rollback will only return the connection to the pool and the transaction will remain open until later reused or removed from the pool. This can result in locks begin held unnecessary and cause other timeouts and rolling block</p> </blockquote> <p>From <a href="http://msdn.microsoft.com/en-us/library/8xx3tyca(VS.80).aspx" rel="nofollow noreferrer">MSDN</a>, section "Transaction Support" (my bold)</p> <blockquote> <p>When a connection is closed, it is released back into the pool and into the appropriate subdivision based on its transaction context. Therefore, you can close the connection without generating an error, <strong>even though a distributed transaction is still pending. This allows you to commit or abort the distributed transaction at a later time.</strong></p> </blockquote>
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    1. POWhat happens to an uncommitted transaction when the connection is closed?
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    1. COConnection pooling happens on the client side, so if the client internally aborts a connection without actually closing it than it is responsible for issuing a rollback or doing whatever it needs to resolve this situation.
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    2. CO@Fozi: unless you have SET XACT_ABORT ON.
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