[Zope] Info on Zope and Databases

I having a bit of a look at zope and database connectivity. One thing that I'm not sure about is if I have two platforms. An Oracle database, and a web server. Does the ZOracle module need access to oracle libs ie does oracle have to be installed on the web platform. Another thing is there any interest in a ZODBC module for Unix ( I don't think that there is one ). Just a wish of mine.