title: Does Sequelize open a new connection to the database for each query execution
body: <p>I'm using nodejs and <a href="http://docs.sequelizejs.com/" rel="nofollow noreferrer">SequelizeJS</a> to my sql database.</p>
  
  <p>After I verify the connection, </p>
  
  <pre><code>sequelize
    .authenticate()
    .then(() =&gt; {
      console.log('Connection has been established successfully.');
    })
    .catch(err =&gt; {
      console.error('Unable to connect to the database:', err);
    });
  </code></pre>
  
  <ol>
  <li><p>Does  <code>Sequelize</code> open a new connection every time it executes a SQL-command or it keeps an open connection and reuses it?</p></li>
  <li><p>How can I verify that?</p></li>
  </ol>