-- Oracle TAF server side not properly configured using srvctl due to bug 6886239 --

Oracle alerted us recently of a non public bug #6886239 "DBMS_SERVICE parameters are not added using srvctl add service. It affects 10g and 11gR1 databases, this is fixed in release 11.2 onwards. In Oracle RAC after setting up TAF although it does not fails and everything looks good, it does not configure correctly.

When you check the service configuration you find no values for failover method, type and retries, those values are needed for TAF to happen.

Creating a service

srvctl add service -d rac -s server_taf -r "rac1,rac2" -P BASIC

Start the service

srvctl start service -d rac -s server_taf

Checking that the services are running.

srvctl config service -d rac

ractest PREF: rac1 rac2 AVAIL:
server_taf PREF: rac1 rac2 AVAIL:

Getting the service ID value

sqlplus /nolog
Connect / as sysdba
SQL> select name,service_id from dba_services where name = 'server_taf';
NAME SERVICE_ID
---------------------------------------------------------------- ----------
server_taf 6

Checking the setup

SQL>col name format a15
col failover_method format a11 heading 'METHOD'
col failover_type format a10 heading 'TYPE'
col failover_retries format 9999999 heading 'RETRIES'
col goal format a10
col clb_goal format a8
col AQ_HA_NOTIFICATIONS format a5 heading 'AQNOT'
SQL>select name, failover_method, failover_type, failover_retries,goal, clb_goal,aq_ha_notifications
from dba_services where service_id = 6
NAME METHOD TYPE RETRIES GOAL CLB_GOAL AQNOT
--------------- ----------- ---------- -------- ---------- -------- -----
server_taf LONG NO

Adding the server side failover parameter to the service

Server side TAF method is BASIC. BASIC is the only value currently supported. This means that a new connection is established at failure time. It is not possible to pre-establish a backup connection. (which is to say, PRECONNECT is not supported)

SQL> execute dbms_service.modify_service (service_name => 'server_taf' -
, aq_ha_notifications => true -
, failover_method => dbms_service.failover_method_basic -
, failover_type => dbms_service.failover_type_select -
, failover_retries => 180 -
, failover_delay => 5 -
, clb_goal => dbms_service.clb_goal_long);
PL/SQL procedure successfully completed.

Check that the service can now see the values for methods, types and retries

SQL>select name, failover_method, failover_type, failover_retries,goal, clb_goal,aq_ha_notifications
from dba_services where service_id = 6
NAME METHOD TYPE RETRIES GOAL CLB_GOAL AQNOT
--------------- ----------- ---------- -------- ---------- -------- -----
server_taf BASIC SELECT 180 NONE LONG YES

Check that the listener has the service registered

lsnrctl services

Create a net service name. Here we have client load balancing between the two nodes.

SERVERTAF =
(DESCRIPTION =
(LOAD_BALANCE = yes)
(ADDRESS = (PROTOCOL = TCP)(HOST = dell01)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = dell02)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = server_taf.za.oracle.com)

You are all set now :-