The following query will show you the information you want:
SELECT r.name rollback_seg_name, l.sid oracle_pid, p.spid system_pid, nvl(p.username,'NO TRANSACTION') username, p.terminal FROM v$lock l, v$process p, v$rollname r WHERE l.sid = p.pid(+) AND trunc(l.id1(+)/65536) = r.usn AND l.type(+) = 'TX' AND l.lmode(+) = 6 ORDER BY r.name ;Use 'SET TRANSACTION USE ROLLBACK SEGMENT rbx' to point the transaction to the desired rollback segment. Start the transaction and then run the script. You should see it show up in the rollback segment you specify.
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This was first published in March 2002