To find the types of Enqueue


  SELECT chr(to_char(bitand(p1, -16777216)) / 16777215) ||
          chr(to_char(bitand(p1, 16711680)) / 65535) "Lock",
          to_char(bitand(p1, 65535)) "Mode"
     FROM v$session_wait
    WHERE event = 'enqueue'
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