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You can easily determine if you are connected to a RAC instance or a standalone instance by running the following query:
SELECT COUNT(*) FROM GV$INSTANCE;
If the value returned is '1', then you are connected to a standalone instance. If the value is greater than one, then you are connected to a RAC instance and the value tells you how many nodes are running in the cluster.
In Oracle 9i and higher, you can failover to another RAC instance when your current instance goes down. You must configure Transparent Application Failover (TAF) in order for this to work. If you have not configured TAF, then you will not failover. Please read the Oracle docs on TAF as there are a few things one should know about its operations before configuring it.
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