Thank you christian! I will try your suggestion. It seems that web2py allows as many connections to different databases as developer needs! Maybe it is good idea to define two database connections like you suggested: one for anonymous/unauthenticated users (db) and another for authenticated users (db_oracle). These databases contains different kind of data: the first (db) contains public data and the second (db_oracle) sensitive/non-public data.
Teemu
