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Sessions that are blocked or blocking other sessions- ORACLE 10g


Finding Total Session Count:


SELECT 'Currently, ' || (SELECT COUNT(*) FROM V$SESSION) || ' out of ' ||
       VP.VALUE || ' connections are used.' AS USAGE_MESSAGE
  FROM V$PARAMETER VP
 WHERE VP.NAME = 'sessions';


To find sessions that are blocked or blocking other sessions, the one of the following queries:


select t.process, t.sid, t.SERIAL#, t.blocking_session, t.USER#, t.USERNAME
  from v$session t
 where blocking_session is not null;


select l1.sid, ' IS BLOCKING ', l2.sid
  from v$lock l1, v$lock l2
   where l1.block =1 and l2.request > 0
  and l1.id1=l2.id1
  and l1.id2=l2.id2;
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