Some vendors offer replication and synchronization products that can replicate Oracle data remotely and take care of client connectivity updates in the event of a failover. XOsoft comes to mind but there are other products available. That said, many of these products include a high availability component that may need to be considered as part of your current plans.
There are also failover-capable network appliances that can help with automatically rerouting network traffic to an alternate location. However, this implies that the network redirection device is not affected by the outage.
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