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Yes, if I understand your question correctly, you can still use RAC and
direct all of your connections to one instance through the client TNS
configuration, then manually reconfigure the application to connect to the
surviving node in event of failover.
I've seen some people accomplish this by configuring the two-node cluster and
leaving one side down, in effect running with a failed node as normal
operations. However, I suspect by not being "RAC-enabled" your application
uses some sort of connection pooling at startup that may require a restart
of the application anyway when failing over from one node to another.
Also, you are correct that 10g SE does not come with the Data Guard option,
but you can manually simulate this by copying your archive logs to the
standby destination and issuing a "recover automatic standby database"
command to apply them. Besides having to script this and closely monitor the
process, you will lose the graceful switchover flexibility and have to
rebuild your standby database again after activation.
Good luck.
Bill
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