> I'm most interested in the features that commercial DBs like Oracle have that free/open-source DBs [..] don't. Are things like "a materialized view (1996!), a

> I'm most interested in the features that commercial DBs like Oracle have that free/open-source DBs [..] don't. Are things like "a materialized view (1996!), a continuous query, the result cache" available in any free DBs nowadays? I cant answer your question, but looking for feature X in other products is the wrong approach IMHO. You're often better served by looking at what problem feature X is solving, and how that problem is other places. Sometimes the problem doesn't even exist.