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I think you must start your service with DBMS_SERVICE.START_SERVICE
Mahir M. Quluzade
The service is running, and if I connect using sqlplus, it will get the failover mode and type.
But if it connect thru our VB application, the failover type and mode is NONE.
That's why I suspect there is some client connectivity constraint.
Based on your output your services are not configured for any kind of failover. How did you define them in the first place? What is the Oracle version?
Remember that TAF is managed from the client side through OCI. Is your VB application going to use the appropriate OCI calls to invoke TAF?