title: How can I specify the natural ordering in MongoDB?
body: <p>Is there a way to specify the natural ordering of data in mongodb, similar to how a primary index would order data in a RDBMS table?</p>
  
  <p>My use case is that all my queries return data sorted by a date field, say <strong>birthday</strong>.  According to <a href="http://www.mongodb.org/display/DOCS/Sorting+and+Natural+Order" rel="nofollow">MongoDB: Sorting and Natural Order</a>, the natural order for a standard (non-capped) collection is roughly the insertion order, but not guaranteed.  This would imply sorting is needed after the data is retrieved.</p>