Interesting article with links from Ilya Grigorik about Tokyo Cabinet, Tokyo Tyrant (remote network access to the DB, via a rest_client p.ex.) and the magnifique [Lua](“http://www.lua.org/" “Lua”) programming language, integrated for the ease of creation of user _designed functions into the server.
A question I asked is the ability, or lack, of dinamically feed the server with extensions, without the need for restarts (updates, etc). Not to miss this article too: [Tokyo Cabinet: Beyond Key-Value Store](“http://www.igvita.com/2009/02/13/tokyo-cabinet-beyond-key-value-store/" “Ilya’s”)Tokyo Cabinet [starts here](“http://tokyocabinet.sourceforge.net/index.html" “Tokyo”) with a nice presentation from its creator, another Japanese developer [Mikio Hirabayashi](“http://alpha.mixi.co.jp/blog/?author=3" “Mikio’s”).
Ruby, Perl, Python et_al bindings available. They say it’s Big in Japan