For the record, eToys.com used Berkeley DB for caching data, and imdb.com used to use it extensively. I don't know if they still do.
So, did they use a regular rbdms to store the data, and to construct "answers" to complicated but frequently asked questions, and then they cached those answers in a Berkeley DB to quickly retrieve and display?
I can imagine that even trying to do simple rdbms things like MAX(), MIN(), BETWEEN, and GROUP kinda SQL stuff would be headache-inducing with BDB.
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