TRANSPARENT APPLICATION FAILOVER FOR RAC RAC provides near-continuous availability by hiding failures from end-user clients and application server clients. This provides continuous, uninterrupted data access. Transparent Application Failover (TAF) is what applications use to sync up with Oracle RAC availability. TAF in the database reroutes application clients to an available database node in the cluster when the connected node fails. Application clients do not see error messages describing loss of service. if the users connection to Node 1 dies, their transaction is rolled back but they can continue work without having to manually reconnect. To get a good understanding of how the TAF architecture works, it is helpful to walk through a failover scenario where a user is querying the database to retrieve 1000 rows from the database. Assume that the user is connected to Node 1/ Instance 1. 1. The heartbeat mechanism between the various nodes...
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