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copied!<p>I researched MongoDB for my social service startup and it is definitely worth considering. MongoDB has a powerful feature set that makes it a realistic and strong alternative to RDBMS solutions. </p> <p>Amongst them:</p> <ol> <li><strong>Document Database:</strong> Most of your data is embedded in a document, so in order to get the data about a person, you don't have to join several tables. Thus, better performance for many use cases.</li> <li><strong>Strong Query Language:</strong> Despite not being a RDBMS, MongoDB has a very strong query language that allows you to get something very specific or very general from a document or documents. The DB is queried using javascript so you can do many more things beside querying (e.g. functions, calculations).</li> <li><strong>Sharding & Replication:</strong> Sharding allows you application to scale horizontally rather than vertically. In other words, more small servers instead of one huge server. And replication gives you fail-over safety in several configurations (e.g. master/slave). </li> <li><strong>Powerful Indexing:</strong> I originally got interested in MongoDB because it allows <em>geo-spatial</em> indexing out of the box but it has many other indexing configurations as well. </li> <li><strong>Cross-Platform:</strong> MongoDB has many <a href="http://www.mongodb.org/display/DOCS/Drivers" rel="nofollow noreferrer">drivers</a>. </li> </ol> <p>As for the documentation, there is not deluge but that is because this project only started in 2009; soon there will be plenty more. However there is enough to get started with your project. In addition to that you can check out Kyle Banker's <a href="http://www.manning.com/banker/" rel="nofollow noreferrer">MongoDB in Action</a>, great resource.</p> <p>Lastly, I had experience only with RDMBS prior to MongoDB, didn't know javascript or json and still found it to be very simple and elegant.</p>

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