Rick Copeland

“The fewer documents in RAM, the more likely the server is to page fault to retrieve documents, and ultimately page faults lead to random disk I/O.”
― Rick Copeland, MongoDB Applied Design Patterns

“By “punting” on these problems and not supporting joins or multidocument transactions at all, MongoDB has been able to implement an automatic sharding solution with much better scaling and performance characteristics than you’d normally be stuck with if you had to take relational joins and transactions into account.”
― Rick Copeland, MongoDB Applied Design Patterns