Portal database dependency

Hi
I am trying to find the answer to the question, how much does the portal rely on its database for operation once the portal has started?
We are running the Portal database on a separate Oracle server and were wondering if there are scenarios where the portal would stop working because it could not get to its database?
Regards

The whole app server can be running other applications beside the portal. It would not be reasonable to shut it down.
A simpler question is what do you do when the application is actually down (for whatever reasons, normal or unexpected). In our case, We simply change the webserver to direct all requests to a maintenance HTML , in which case whether the Portal is up or down is irrelevant. In some case's you might need the Portal Up to diagnose issues (e.g, the DB is up but the portal cant connect to it ).
One last question - does the portal reconnect automatically when its database comes back up?Normally yes. But that assumes you have set up testing on the portal related pools. (basically if the DB is bounced the connection in the pool has become invalid and it depends on the settings whether the portal will test if the connection is valid before using it / after releasing it)..However I do know that in earlier versions we had to bounce the portal server as well because it still threw errors(but sometimes only) , you'd have to test it out.

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