How to create a service for TAF without LB?

Question

Hi,all:
env: 11.2.0.1 RAC (2 nodes of test6/test7 ,corresponding instance: testrac1/testrac2),db :testrac
I want to create a service to use Service-side TAF ,and also need let some app use rac1 only ,while other app use rac2 only. So I issue the following command:
testrac1: srvctl add service -d testrac -s testsrv -r testrac1 -a testrac2 -P BASIC -y AUTOMATIC -j LONG -e SELECT     -m BASIC -z 5 -w 30
srvctl start service -d testrac -s testsrv
create user cxall to test:
create user cxall identified by cxall ;
grant resource,create session,select any dictionary to cxall;
and I add entry in tns:
testrac_11g_staf =
(DESCRIPTION=
(ADDRESS = (PROTOCOL = TCP)(HOST = test6-vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = test7-vip)(PORT = 1521))
(CONNECT_DATA=(SERVICE_NAME=testsrv))
on client:
sqlplus cxall/cxall@testrac_11g_staf
select host_name from v$instance;
HOST_NAME
test6
and then I shutdown testrac1 to simulate testrac1 is off service:
srvctl stop instance -d testrac -i testrac1
and then re-execute the above command:
select host_name from v$instance;
It return error.report ORA-03113.
Can not fail over to testrac2!
why ?

Answer 1

$>srvctl status service -d testrac -s testsrv
Service testsrv is running on instance(s) testrac1
$>srvctl config service -d testrac -s testsrv
Service name: testsrv
Service is enabled
Server pool: testrac_testsrv
Cardinality: 1
Disconnect: false
Service role: PRIMARY
Management policy: AUTOMATIC
DTP transaction: false
AQ HA notifications: false
Failover type: SELECT
Failover method: BASIC
TAF failover retries: 5
TAF failover delay: 30
Connection Load Balancing Goal: LONG
Runtime Load Balancing Goal: NONE
TAF policy specification: BASIC
Preferred instances: testrac1
Available instances: testrac2
if I stop instance testrac1,
srvctl stop instance -d testrac -i testrac1
$>srvctl status service -d testrac -s testsrv
Service testsrv is not running.
the testsrv service cannot start on instance testrac2 auto,so the client connection will return ORA-12514 due to the testsrv is not running.
I have a doubt why Available instances doesn't effect!
If I use the following :
srvctl add service -d testrac -s testsrv -r testrac1,testrac2 -P BASIC -y AUTOMATIC -j LONG -e SELECT     -m BASIC -z 5 -w 30
the TAF will work well.But that may let some connection use testrac2 instance.
So I have such idea:
1.create service
srvctl add service -d testrac -s testsrv -r testrac1,testrac2 -P BASIC -y AUTOMATIC -j LONG -e SELECT     -m BASIC -z 5 -w 30
2.
srvctl start service -d testrac -s testsrv
3.
client tns:
testrac_11g_staf =
(DESCRIPTION=
(load_balance=off)
(ADDRESS = (PROTOCOL = TCP)(HOST = test6-vip)(PORT = 1521)) ---I need app only use test6,but also need TAF
(ADDRESS = (PROTOCOL = TCP)(HOST = test7-vip)(PORT = 1521))
(CONNECT_DATA=(SERVICE_NAME=testsrv))
4.
some test script:
in test6:
I make a huge file copy to make the test6 high load.
cat a.sh
count=0
while [ $count -lt 3 ] ;
do
count=`expr $count + 1`
cp *.zip aa
rm -rf aa/*.zip
done
nohup sh a.sh &
test.sh ---a loop shell to test which instance it connect
count=0
while [ $count -lt $1 ] ;
do
count=`expr $count + 1`
sqlplus -s cxall/cxall@testrac_11g_staf<test.sql
done
test.sql
col host_name format a30
select host_name from v$instance;
5.
perform the test:
test6:
sh test6.sh 10000 --- the output is test6
sh a.sh ---make the test6 high load,the tes6.sh output is still "test6"
srvctl stop instance -d testrac -i testrac1 -o abort ---stop testrac1 of test6
---the test6.sh output become to "test7" ,TAF is affect.
srvctl start instance -d testrac -i testrac1 ---restart instance testrac1 of test6 again
---the test6.sh output revert to "test6"
the test indicate the TAF and non-LB all work well.