Oracle Listener Failovers When Using Multiple Listeners:
1> Connect-Time Failover
The Connect-Time Failover feature allows clients to connect to another listener if the initial connection to the first listener fails. Multiple listener locations are specified in the clients tnsnames.ora file.
2>Transparent Application Failover
The Transparent Application Failover (TAF) feature is a runtime failover for high-availability environments, such as Oracle Real Application Clusters. TAF fails over and reestablishes application-to-service connections. It enables client applications to automatically reconnect to the database if the connection fails and, optionally, resume a SELECT statement that was in progress. The reconnection happens automatically from the OCI library.The following code shows an example of the tnsnames.ora file setup for using
3>Client Load Balancing
Client Load Balancing is a feature that allows clients to randomly select from a list of listeners.Oracle Net moves through the list of listeners and balances the load of connection requests across the available listeners.
4>Connection Load Balancing
Connection Load Balancing is a feature that enables better distribution of connection among a group of dispatchers in an Oracle Shared Server environment. The next chapter explains this concept in more detail.
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