Oracle How to found current running SQL

SELECT osuser, username, sql_text
from v$session a, v$sqltext b
where a.sql_address =b.address
order by address, piece;

select sid,user_name,sql_text
from v$open_cursor
where sid in (select sid from (select sid,serial#,username,program
from v$session
where status='ACTIVE'));

select s.USERNAME, sq.SQL_TEXT, s.LAST_CALL_ET
from v$open_cursor oc, v$sql sq, v$session s
where oc.HASH_VALUE = sq.HASH_VALUE
and s.SID = oc.SID
and s.STATUS = 'ACTIVE';