If you're interested in how much computation gets pushed down into the MongoDB database, versus how much gets pulled back into PostgreSQL, you can find some exa

If you're interested in how much computation gets pushed down into the MongoDB database, versus how much gets pulled back into PostgreSQL, you can find some examples here: http://slamdata.com/blog/2015/12/08/nosql-analytics-for-mongodb.html http://slamdata.com/blog/2015/12/08/nosql-analytics-for-mong... Warning: It's not pretty.