Description of problem:
Running probe named "Oracle: Idle Sessions" generates following error:
ORA-00918: column ambiguously defined 

Version-Release number of selected component (if applicable):
NOCpulsePlugins-2.208.6-7.el5sat

How reproducible:
Always

Steps to Reproduce:
1. Install Satellite 5.3.0, enable monitoring & monitoring scout
2. Register a client with a running oracle server, listener available
from outside
3. Setup a "Oracle: Idle Sessions" probe for it
4. on your satellite: #su - nocpulse
5. as a nocpulse user: $ rhn-runprobe ...
  
Actual results:
$ rhn-runprobe --live 69
NOCpulse::Probe::InternalError: Database error 918 executing query select count(*) as COUNT 
                                  from v$session_wait a, v$session b
                                  where event = 'SQL*Net message from client'
                                  and a.seconds_in_wait >= ?
                                  and a.sid = b.sid
                                  and b.username is not null
                                  with 36000: ORA-00918: column ambiguously defined (DBD ERROR: error possibly near <*> indicator at char 79 in 'select count(*) as COUNT 
                                  from v$session_wait a, v$session b
                                  where <*>event = 'SQL*Net message from client'
                                  and a.seconds_in_wait >= :p1
                                  and a.sid = b.sid
                                  and b.username is not null
                                 ')     /usr/lib/perl5/vendor_perl/5.8.8/NOCpulse/Probe/DataSource/AbstractDatabase.pm line 186
        called from /usr/lib/perl5/vendor_perl/5.8.8/NOCpulse/Probe/DataSource/AbstractDatabase.pm line 190
        called from /usr/lib/perl5/vendor_perl/5.8.8/NOCpulse/Probe/DataSource/Oracle.pm line 112
        called from /usr/lib/perl5/vendor_perl/5.8.8/NOCpulse/Probe/DataSource/AbstractDatabase.pm line 133
        called from /var/lib/nocpulse/libexec/Oracle/IdleSessions.pm line 18
        called from /usr/lib/perl5/vendor_perl/5.8.8/NOCpulse/Probe/ProbeRunner.pm line 115
        called from /usr/lib/perl5/vendor_perl/5.8.8/NOCpulse/Probe/ProbeRunner.pm line 131
        called from /usr/bin/rhn-runprobe line 59
2009-08-24 09:18:42     Caught an error, status changing to UNKNOWN
2009-08-24 09:18:42 
============================================================
UNKNOWN: Internal problem executing check. Please contact Red Hat
============================================================


Expected results:
No error, probe works.

Additional info:
N/A