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how to tell if oracle session is still active and running?


First look for you session status:
select * from v$session where status = 'ACTIVE';

then check the long operation table to try to estimate the progress pace

SELECT (sofar/totalwork)*100  as percent, 
  FROM v$session_longops
 WHERE sofar <> totalwork

If you encounter this wait event : "wait for unread message on broadcast channel" 
probably your session is still alive and running


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