Been wrestling with BigTable for a while now because of appengine. Everything works fine till you need to implement a one-to-many or many-to-many relationship (no joins in NoSQL dbs). Heh.
NoSQL is useful for massively distributed storage systems like Google's or AWS. I found the science in this document especially illuminating.
Another useful link.
We discussed this a gazillion threads ago and I just noticed that
employers now consider knowledge on distributed non-relational
database systems as beneficial/advantageous for Perl/Python/PHP
Software Engineer positions.
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