How to change the current configuration of APEX to point to a different database running.

The following are the steps we are going to perform with this DR test exercise.

1) We shut down our production database and restore the production backup on another machine.

2) We assign the production IP address & hostname to the machine on which we are going to restore database backup.

3) Now we want to check all our current application connections and Apex services with the newly restore the database on other machines 

4) Now we point all our application and apex apps to the new machine on which we restored the database backup.

Now the question is do we need to perform any application or Apex configuration changes.