Long sys session active after rman backup completed

Question

Hi all,
We use Oracle DB 11g in RAC and the Rman backups running on SLES 11 SP1.
All days the backup jobs are executed normally, but, sometimes some SYS sessions (used during the backup, i think) remains ACTIVE by hours (day, weeks...)
At this moment, we have 3 sessions running (actives) since Nov, 04. Their LOGON_TIME is the same backup job start time.
The current statement is empty. I think that is relationed with the backup Job. The processes are ORAOxxx and there are sessions in ASM instance with the same LOGON_TIME.
What can we DO? Kill these sessions?
The last time we restarted the Oracle DB instance, but the "zombies" sessions came back soon, after a backup job. :(
Thanks!

Answer 1

Thanks,
but I know how to query the sessions, I use Gv$session because it´s an oracle cluster.
I Want to Know: What do we have to do with the long sessions? To kill? Simply?
--> Below the query to see the sessions:
'ACTIVE' or 'INACTIVE':
SELECT 'kill -9 '
|| b.spid
|| ' # '
|| a.inst_id
|| ' - '
|| a.username
|| ' - '
|| a.program
|| ' - '
|| TO_CHAR (a.logon_time, 'DD-MM-YYYY HH24:MI:SS')
|| ' - '
|| TRUNC (a.last_call_et / 60 / 60, 0)
|| ' horas - '
|| a.status
FROM gv$session a, gv$process b
WHERE a.username IS NOT NULL
AND a.last_call_et / 60 / 60 > 4
AND a.status = 'INACTIVE'
AND a.paddr = b.addr
AND a.inst_id = 1
ORDER BY a.last_call_et DESC
---------- The result is:
kill -9 20516 # 3 - SYS - oracle@art (O003) - 04-11-2011 01:07:51 - 88 horas - ACTIVE
kill -9 26562 # 3 - SYS - oracle@art (O003) - 04-11-2011 01:07:51 - 88 horas - ACTIVE
kill -9 13213 # 3 - SYS - oracle@art (O004) - 05-11-2011 01:02:12 - 64 horas - ACTIVE
kill -9 26021 # 3 - SYS - oracle@art (O004) - 05-11-2011 01:02:12 - 64 horas - ACTIVE
kill -9 21749 # 3 - SYS - oracle@art (O004) - 05-11-2011 01:02:12 - 64 horas - ACTIVE
kill -9 1844 # 3 - SYS - oracle@art (O005) - 05-11-2011 01:02:12 - 64 horas - ACTIVE
kill -9 2214 # 3 - SYS - oracle@art (O005) - 05-11-2011 01:02:12 - 64 horas - ACTIVE
kill -9 21759 # 3 - SYS - oracle@art (O005) - 05-11-2011 01:02:12 - 64 horas - ACTIVE