title: The use of c3p0.idle_test_period.
body: <p>I'm new to c3op, and confused about the use of : </p>
  
  <pre><code>c3p0.idle_test_period
  </code></pre>
  
  <p>In this link : <a href="https://community.jboss.org/wiki/HowToConfigureTheC3P0ConnectionPool">HowTo configure the C3P0 connection pool</a></p>
  
  <pre><code>idleTestPeriod :  Must be set in hibernate.cfg.xml (or hibernate.properties), Hibernate default:  
  0, If this is a number greater than 0, c3p0 will test all idle, pooled but unchecked-out  
  connections, every this number of seconds.
  </code></pre>
  
  <p>What is the purpose of this kind of test (idel, pooled connections), and the relationship between c3p0.idle_test_period and c3p0.timeout?</p>