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Configure Role-based Database Service for auto client failover

Our Oracle Database version EE 11.2.0.2.0,  Oracle client is Oracle 10g,  I am using SQL*Plus, not data guard broker to manage one physical standby.  Most application is connecting to Oracle DB through Oracle Net, one application connects to Oracle DB by Oracle Advanced Queuing (AQ).  While I am performing switchover, it might take 3 to 5 min. Currently the service is created only with service_name and network_name by following Doc [ID 740029.1] .   For best practice, is there any recommendation about defining the database service in server side in our environment?

 

exec DBMS_SERVICE.MODIFY_SERVICE (

service_name => 'parcddgp',

network_name => 'parcddgp',

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