SQL to get who uses the UNDO segments

Hello I need to enter SQL which uses the UNDO segments. Is there anything out there for me to do. We want to track down the user who runs our database UNDO segments upwards. We think we know who did this by monitoring sql albums but management wants more evidence as usual. Any help would be great.
SELECT TO_CHAR(s.sid)||','||TO_CHAR(s.serial#) sid_serial,
NVL(s.username, 'None') orauser,
s.program,
r.name undoseg,
t.used_ublk * TO_NUMBER(x.value)/1024||'K' "Undo"
FROM sys.v_$rollname    r,
sys.v_$session     s,
sys.v_$transaction t,
sys.v_$parameter   x
WHERE s.taddr = t.addr
AND r.usn   = t.xidusn(+)
AND x.name  = 'db_block_size';

-André

Tags: Database

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