title: Oracle 10g Enterprise manager charts issue
body: <p>Heloo,
  Database is Oracle Database 10g Release 10.2.0.5.0 - 64bit Production.
  RAC with 2 nodes.
  In EM on activity i have situations like below:</p>
  
  <p><a href="https://i.stack.imgur.com/o9Dzj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/o9Dzj.png" alt="Node1"></a></p>
  
  <p><a href="https://i.stack.imgur.com/iLqTp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iLqTp.png" alt="Node2"></a></p>
  
  <p>Why are gaps in chart with active sessions.
  In this period of time, on each node where at least 4 active session.</p>
  
  <p>Thank you.</p>