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Well, I'm sold. I checked out Mongo before, and it was relatively pleasant. But I wonder if Couch is more reliable and mature? I'd love to dive into building a brand new system I have in mind that seems like a good fit for a document database.

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I've used it with rails for a short time now, still trying to dig deeper -- I really don't know if it's more reliable or mature than Mongo, but it was also a relatively pleasant experience. Also, I do know that it integrates very nicely with rails, and that you should use couchrest with it if you're on rails (http://github.com/couchrest/couchrest).

Side comment: learning to write map reduce algos instead of just querying was kind of difficult at first (for document databases in general). The article seems to have neglected to mention it -- it had the steepest learning curve in the overall couch-learning process for me.

In my few months with Couch I've found it to live up to its "relax" motto, at least until I hit pagination. What you have to go through will seem grotesque to anyone coming from SQL.

http://github.com/cpinto/python-couchdb-paginator

haven't used this but i saw this on SO the other day ... I just started looking at the whole NoSQL paradigm to experiment in the near future and i felt it was helpful to track some tags on StackOverflow to learn about issues people face...

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