eXtremeDB,
mentioned above, is commercial of course. You have to fill out a
registration form in order to read any Docs, so I did not bother. But
their top level blurb says:
"eXtremeDB stores data in the exact form in which it is used by the
application - no mapping a C data element to a relational
representation, for example"
And their
white paper
appears to be a misguided attempt to tout the supposed superiority of
their one record at a time "navigational API" over SQL-like set-based
APIs. Therefore, yuck, this product is
Not Interesting.
