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Oracle Database 11g Oracle Real Application Clusters Handbook, Second Edition by K Gopalakrishnan

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Transparent Application Failover

Transparent Application Failover (TAF) enables an application user to reconnect to a database automatically if a connection fails. Active transactions roll back, but the new database connection, achieved using a different node, is identical to the original node. This is true regardless of how the connection fails.

TAF notifications are used by the server to trigger TAF callbacks on the client side. TAF is configured using either a client-side-specified Transparent Network Substrate (TNS) connect string or using server-side service attributes. However, if both methods are used to configure TAF, the server-side service attributes will supersede the client-side settings, because the server-side service attributes ...

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