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MongoDB is webscale, that's all you need to know, keep in mind that webscale means a database that will fit in 16 to 256 GB of RAM, and doesn't need transaction support.

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Thanks for all the replies. I wasn't actually trying to put mongodb (or nosql in general) down, there sure is a use for these technologies. The amount of money just seems staggering (money in the IT world nowadays seems to be off the charts, re. facebook et. al.), and it probably will be hard to put it all to productive use. But it will of course also help to improve the product so no worries :)

And indeed, I do have a relational database with a column that stores json! The horrors :)

You could help me get familiar with mongodb, any good real world tutorials for it? I have played with it just a little.

There is an official tutorial on http://mongodb.org, just click "Try It Out" in the top banner. Karl Seguin also wrote two great tutorials (one on basics, one on geo queries) at http://tutorial.mongly.com/.

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