text: -- qtde de transacoes por segundo (dos ultimos 60 segundos)
  SELECT      'Txns Per Sec', a.epx / b.ept
  FROM        (   SELECT  value epx
                  FROM    v$sysmetric
                  WHERE   group_id = 2 -- 60 sec interval
                  AND     metric_name = 'Executions Per Sec' ) a,
              (   SELECT  value ept
                  FROM    v$sysmetric
                  WHERE   group_id = 2 -- 60 sec interval
  AND         metric_name = 'Executions Per Txn' ) b