Why can't I add items to the database?

Is MongoDB (or other document database) a good noSQL option for application where it has users (millions ) and user can have one or more lists, each list containing items (photo, video, note, song)  associated with users. Users can add more lists, delete lists...users can add items to lists, delete

• Answer:

  Of course this is possible. I would not store any blobs in the database though, instead using S3 or CloudFiles, depending on what you need to do with the data. Here is how I would approach this: * Start using a hosted database like http://mongohq.com . The $50 plan should be good enough for your needs in terms of volume. You can always upgrade later when you have high numbers of concurrent user activity. * Implement a test server in node.js and mongoose.  Create some test data. * Use any load testing tool to test the performance of this. * Fine tune the schema until you have derived an optimum for your use case. The key to making this work is having a good understanding of the underlying data set, especially the quantities involved (How many items does a list have, etc), and your ability to let go of things you learned when creating SQL schemas (like normalizing the db).