Question

Point out the correct statement.

(a) Use sharded clusters if your data set approaches or exceeds the storage capacity of a single MongoDB instance

(b) Use sharded clusters if a single MongoDB instance can meet the demands of your write operations, and all other approaches have not reduced contention

(c) Use sharded clusters if the size of your system’s active working set will soon exceed the capacity of your system’s minimum RAM

(d) All of the mentioned

This question was posed to me in an online interview.

This intriguing question originated from Cluster Architectures in chapter Sharding Concepts, Mechanics and Sharded Cluster of MongoDB

Answer 1

Correct option is (a) Use sharded clusters if your data set approaches or exceeds the storage capacity of a single MongoDB instance

To explain: The balancer is a background process that manages chunk migrations.