title: node.js mongodb closing the connection
body: <p>I am trying to use node.js with mongodb and following the tutorial at <a href="http://howtonode.org/express-mongodb" rel="noreferrer">http://howtonode.org/express-mongodb</a></p>
  
  <p>The code for opening the connection is </p>
  
  <pre><code>ArticleProvider = function(host, port) {
   this.db= new Db('node-mongo-blog', new Server(host, port, {auto_reconnect: true}, {}));
   this.db.open(function(){});
  };
  </code></pre>
  
  <p>However i cannot see any connections being closed. 
  But when i see the logs on the mongo console, i can see that are connections which open and they close after some time.</p>
  
  <p>Does the connection close automatically? Will it be a problem when a large no of clients try to access the server? Where should the connection be closed? </p>
  
  <p>Thanks</p>
  
  <p>Tuco</p>