Swapping between 2 Oracle instances and Discoverer

We have this strategy of swapping between 2 Oracle instances every month to minimize downtime for our users. Our data warehouse is refreshed every month which takes about 2 to 4 days. Instance 2 is being re-loaded with next month's data, while users are currently pointing to Instance 1, loaded with current month's data. Once re-load is completed with Instance 2, users will now have to point to Instance 2. This goes on every month. How can we implement swapping, without our Discoverer users even knowing that the database had been swapped?

If you are using Discoverer on the web, every two months you can change the TNS entry for the database on all the Discoverer server machines. That way the users type the same database alias (or you can code it into the URL so they don't have to type it), and Discoverer will connect to whichever database you have defined for that alias. Since the TNSnames.ora file is not on the users' machines, you can update them as you need.

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