Fair point. I was unfamiliar with B-Trees because most of my time is spent as DevOps/Networking/Sysadmin. It took me 15 minutes to learn and understand what they are and how they work.

http://slady.net/java/bt/view.php?w=800&h=600 http://en.wikipedia.org/wiki/B-tree http://en.wikipedia.org/wiki/B%2B_tree http://guide.couchdb.org/draft/btree.html

Now if you make understanding B-trees a prerequisite for the job, I can at least learn it ahead of time for the position.