How do you get four times the demand for resources from two nodes?
The "promised efficiency" of any system is a complex question. The dynamic schema approach of MongoDB makes it trivial to update schema design on the fly so I am confused by "no real easy way to correct once deployed".
BTW : The recommended production setup is three nodes (one primary, two secondaries). This is what you get by default in MongoDB Atlas (you can't go smaller).
The "promised efficiency" of any system is a complex question. The dynamic schema approach of MongoDB makes it trivial to update schema design on the fly so I am confused by "no real easy way to correct once deployed".
BTW : The recommended production setup is three nodes (one primary, two secondaries). This is what you get by default in MongoDB Atlas (you can't go smaller).
(I work for MongoDB)