About load balancing in rac

Question

Dear Gurus
I want to ask about load balancing in RAC.
we have two nodes rac1 rac2 with physical ip as virtual ip as
rac1 rac2
physical 10.22.1.50 10.22.1.51
virtual 10.22.1.54 10.22.1.55
and two appliction servers app1 app2.Actually in tns file of app1 there is entry of virtual ip of rac1 (10.22.1.54)and in app2 virtual ip of rac2 (10.22.1.55). so we want to test whether load balancing is happening or not .like if app2 is down so whether the connection of app1 moving to rac2 also or not
so we down app2 and check.Guys tell me how could i check in that duration that whether connnection going to rac2.
i am unable to find the parameter of sessions connected in awr .Please tell how could i identify

Answer 1

i have stopped the IM's of one of my application server and checked the connections to my database with below query and according to it its connecting to both instances.Does it means that load balancing is happening fine.
SQL> SELECT inst_id, TO_CHAR(logon_time, 'DD-MON-YYYY HH24:mi:ss') "Hour when connected", count(*) "DB Sessions"
2 FROM gv$session
3 WHERE type = 'USER' and TO_CHAR(logon_time, 'DD-MON-YYYY HH24:mi:ss') like '%05-OCT-2011 17%'
4 GROUP BY inst_id, TO_CHAR(logon_time, 'DD-MON-YYYY HH24:mi:ss')
5 ORDER BY inst_id, TO_CHAR(logon_time, 'DD-MON-YYYY HH24:mi:ss');
INST_ID Hour when connected DB Sessions
1 05-OCT-2011 17:20:06 1
1 05-OCT-2011 17:27:18 1
2 05-OCT-2011 17:11:31 1
2 05-OCT-2011 17:26:28 2
2 05-OCT-2011 17:26:38 1
2 05-OCT-2011 17:27:18 1