Who is generating excessive redo in Oracle

Who is generating excessive redo  in Oracle

      SELECT s.sid, s.serial#, s.username, s.program,
      t.used_ublk, t.used_urec
      FROM v$session s, v$transaction t
      WHERE s.taddr = t.addr
      ORDER BY 5 desc, 6 desc, 1, 2, 3, 4;

Prompt My session redo....

select a.name, b.value
from v$statname a, v$mystat b
where a.statistic# = b.statistic#
and a.name = 'redo size';