查询Oracle正在运行SQL的SQL命令

查询Oracle正在运行SQL的SQL命令：

select a.EVENT, a.SQL_ID, a.MACHINE, b.SQL_TEXT, b.SQL_FULLTEXT,b.FIRST_LOAD_TIME,b.LAST_LOAD_TIME,b.LAST_ACTIVE_TIME
  from v$session a, v$sql b
where a.SQL_ID = b.SQL_ID
   and a.USERNAME is not null
   and a.STATUS = 'ACTIVE'