Enabling Fast Connection Failover for Oracle Call Interface Clients

Oracle Call Interface clients can enable Fast Connection Failover (FCF) by registering to receive notifications about Oracle Restart high availability FAN events and respond when events occur.

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This improves the session failover response time in Oracle Call Interface and removes terminated connections from connection and session pools. This feature works on Oracle Call Interface applications, including those that use Transparent Application Failover (TAF), connection pools, or session pools.

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First, you must enable a service for high availability events to automatically populate the Advanced Queuing ALERT_QUEUE. If your application is using TAF, then enable the TAF settings for the service. Configure client applications to connect to an Oracle Restart database. Clients can register callbacks that are used whenever an event occurs. This reduces the time that it takes to detect a connection failure.

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During DOWN event processing, Oracle Call Interface:

  • Terminates affected connections at the client and returns an error

  • Removes connections from the Oracle Call Interface connection pool and the Oracle Call Interface session pool

    The session pool maps each session to a physical connection in the connection pool, and there can be multiple sessions for each connection.

  • Fails over the connection if you have configured TAF

If TAF is not configured, then the client only receives an error.

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