Hmm... if it's BDB, why is SDB lacking so many functionality of BDB then?!

After a cursory look, SDB has more in common with Mnesia than with BDB.

http://erlang.mirror.libertine.org/doc/apps/mnesia/Mnesia_ch...

That's a totally speculative inference. Amazon is a big company, and just because someone in Amazon wrote a BDB interface for erlang doesn't mean SimpleDB is erlang + BDB.

Here-say and speculation, although not that far fetched.

I don't believe any of this hogwash . . . SimpleDB is clearly just a big memory-resident hash table.