Why Document DB ( like mongodb and couchdb ) are better for large amount of data ?

Posted by xRobot on Stack Overflow See other posts from Stack Overflow or by xRobot
Published on 2010-04-30T16:48:37Z Indexed on 2010/04/30 18:07 UTC
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I am very newbie to this world of document db.

So... why this db are better than RDBMS ( like mysql or postgresql ) for very large amount of data ?

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