Fast Connection Failover (FCF) is a clear demonstration of the high degree of integration between OracleAS middle tiers and Oracle Real Application Cluster (RAC) databases. FCF is a 10g RAC client provided by the JDBC Implicit Connection Cache (ICC) that uses Oracle Notification Server (ONS) as the communication vehicle for event communication between the two tiers. FCF requires proper datasource and ONS configuration between middle tiers and databases. This configuration may vary depending on the OracleAS and the Oracle DB release. The flow of ONS notifications between these two tiers and the proper consumption of them by the JDBC drivers are critical for a correct Fast Connection Failover configuration.
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