Hi,
I don't think we will ever get ETP ported to Oracle, due to the feature of explicit sorting. ETP makes use of tree_sortkey for this feature. I tried to help out Don just hours before 4.5 came out, but to my realization of the fact that it depends on a PG specific data model.
It is now being brought up again. Since my CMS also needs this feature, its on the thread Dave started here:
https://openacs.org/forums/message-view?message_id=51959
