Control file heartbeat

Question

Hi,
on 10g R2, I follow this article :
http://www.dba-oracle.com/concepts/query_wait_events.htm
Then,
SQL> Select wait_class, sum(time_waited), sum(time_waited)/sum(total_waits)
Sum_Waits
From v$system_wait_class
Group by wait_class
Order by 3 desc;  2    3    4    5
WAIT_CLASS                                                       SUM(TIME_WAITED)  SUM_WAITS
Idle                                                                     25575055 20.4177384
Other                                                                        2742 2.70414201
Administrative                                                                 49       2.45
SQL> Select a.event, a.total_waits, a.time_waited, a.average_wait
  2     From v$system_event a, v$event_name b, v$system_wait_class c
  3    Where a.event_id=b.event_id
  4     And b.wait_class#=c.wait_class#
  5        And c.wait_class in ('Other')
   order by average_wait desc;  6
EVENT                                              TOTAL_WAITS TIME_WAITED AVERAGE_WAIT
control file heartbeat                                       1         391       390.71
rdbms ipc reply                                             15         311         20.7
enq: CF - contention                                        43         647        15.04
kksfbc child completion                                      8          35         4.41
SQL> select a.sid, a.event, a.total_waits, a.time_waited, a.average_wait
from v$session_event a, v$session b
where time_waited > 0
and a.sid=b.sid
and b.username is not NULL
and a.event='control file heartbeat'; 
no rows selectedThen why there is no row for control file heartbeat wait event in v$session_event a, v$session b ?
Thank you.

Answer 1

Is this a RAC system? The only place where I can think of Control File Heartbeat would be used at the moment would be for RAC's Instance Membership. In this each instance updates the control file that its there and if not, that would be evicted. That said, why you are worried about this wait event?
And after 4000+ posts, you must know that 10gr2 is not a version number but 10201, 10202 etc is.
Aman....