Webapp should dynamically choose second DB when first DB is down.

I need to create a web app, considering disaster recovery situation. I have to DBs on two remote locations.
Now what necessary steps should I take, so that when one DB is down, my app will pick Another DB?
Please help me out...!!!
Note: I'm using Jdev 11.1.1.4 version & Oracle XE 10g version

This is something you normally handle on the wls where you set up a cluster and a rac db connection to a rac db.
You can configure the data sources on the wls to check each connection before checking it out of the pool. This check is then used to use the other db from the rac.
This however needs the full Oracle db. You can't do this with XE.
If you want somehow mimic this yourself you have to handle the db connections yourself which needs some tweaking of the framework.
Timo

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Webapp should dynamically choose second DB when first DB is down.

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