You could write a new SQL Builder class (i think that's the correct term) which handles all of vanillas database interaction. Currently it can deal with mysql and sqlite (i believe) but the theory behind the sql builder is to let you convert it over to any form of database. Depends how knowledgeable you are i guess...?
The purpose of the sql buider is to make is to allow you to make vanilla work on something else than mysql. So, hopefully you won't have to rewrite it.
The class you need to extend is database (library/Framework/Framework.Class.Database.php). Save your oracle class as library/Framework/Framework.Class.Oracle.php And add $Configuration['DATABASE_SERVER'] = 'Oracle'; in conf/settings.com
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The class you need to extend is database (library/Framework/Framework.Class.Database.php).
Save your oracle class as library/Framework/Framework.Class.Oracle.php
And add $Configuration['DATABASE_SERVER'] = 'Oracle'; in conf/settings.com