[{"user":1,"size":10},{"user":1,"size":200},{"user":1,"size":3000},{"user":1,"size":40000},{"user":1,"size":500000},{"user":2,"size":10},{"user":2,"size":200},{"user":2,"size":3000},{"user":3,"size":40000},{"user":3,"size":500000}]

db.collection.find()