find redo generated by current sessions

select v$session.sid, username, value redo_size

from v$sesstat, v$statname, v$session

where v$sesstat.STATISTIC# = v$statname.STATISTIC#

and v$session.sid = v$sesstat.sid
and name = ‘redo size’

and value > 0

and username is not null

order by value

/