title: How to find the timestamp of the last lock?
body: <p>I want to determine which process locks my table TABLE1, and the timestamp when it was locked.</p>
  
  <p>I suppose that I should use tables like <code>dba_locks</code> and <code>gv$session</code>, but I'm new on Oracle and I don't know much about system tables.</p>
  
  <p>Can anybody help me with this query?</p>