How to calculate how much undo space a session is consuming

Hello,
How do I calculate how much space a session is currently consuming undo tablespace? Thank you.

Try this query...it's a start anyways:
select n.name, s.value
from v$statname n , v$sesstat s
where s.sid = &sid
and n.statistic# = s.statistic#
and (n.name like '%undo%' or n.name like '%rollback%')
order by n.class, n.name
Enter the SID when prompted.

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