Transparent Application Failover (TAF) FAILED!

Question

Dear all,
I have installed RAC 10gR2 on 64-bit Oracle Enterprise Linux, iscsi as shared disks and ASM as storage option. I follwoed document hunter_rac10gr2_iscsi.
Everything is ok both database instance are up and running.
Value in the show parameter services is
bss.beaconhouse.edu.pk, orcl_taf, ora_devp
TNSNAMES.ORA file on a window based client machine contains the following entry:
ora_devp, ora_devp.world =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.63)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.64)(PORT = 1521))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = bss.beaconhouse.edu.pk)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 5)
But still when I connect to database from client machine and after verifying the connected instance, I stop the services of that instance from RAC server. The client automatically do not shirt to the second instance but give error.
My Transparent Application Failover is not configured properly. Though as i told you both instance are UP and running i can stop and start any one instance.
Kindly help me to implement the very basic feature of RAC.
Thanks, Imran

Answer 1

It seems that Hunter's scripts configure only the "oracle_taf" service for TAF.
Therefore, to test TAF your client should be attempting to connect to the TAF
service "oracle_taf" not "bss.beaconhouse.edu.pk"
See under Step 24
Database Services : For this test configuration, click Add, and enter orcl_taf as the "Service Name." Leave both instances set to Preferred and for the "TAF Policy" select "Basic".
and
"Create the orcl_taf Service
During the creation of the Oracle clustered database, you added a service named orcl_taf that will be used to connect to the database with TAF enabled. During several of my installs, the service was added to the tnsnames.ora, but was never updated as a service for each Oracle instance.
Use the following to verify the orcl_taf service was successfully added:
SQL> show parameter service
NAME TYPE VALUE
service_names string orcl.idevelopment.info, orcl_taf
If the only service defined was for orcl.idevelopment.info, then you will need to manually add the service to both instances:
SQL> show parameter service
NAME TYPE VALUE
service_names string orcl.idevelopment.info
SQL> alter system set service_names =
2 'orcl.idevelopment.info, orcl_taf.idevelopment.info' scope=both; "
and step 30
TAF Demo
From a Windows machine (or other non-RAC client machine), login to the clustered database using the orcl_taf service as the SYSTEM user:
C:\> sqlplus system/manager@orcl_taf
Message was edited by:
Hemant K Chitale