title: Cached connection manager in jboss/wildfly
body: <p>I have defined a datasource for JBoss AS 7.4, with min/max pool sizes, tracing of idle connections etc.</p>
  
  <p>I am confused about the datasource <code>use-ccm</code> property.</p>
  
  <ul>
  <li>What does it do?</li>
  <li>Why use it?</li>
  </ul>
  
  <p>I thought the datasource itself manages the connection pool. </p>