What is a cluster in MongoDB?

Question

I am someone new to mongoDB and have absolutely no knowledge regarding databases so I would like to know what is a cluster in MongoDB and what is the point of connecting to one in MongoDB? Is it a must to connect to one or can we just connect to the localhost?

Answer 1

A mongodb cluster is a word usually used for a sharded cluster in mongodb. The main purposes of a sharded mongodb are:

• The scale reads and writes along with several nodes

• Each node does not handle the whole data so you can separate data along with all the nodes of the shard. Each node is a member of a shard (which is a replica set, see below for the explanation) and the data are separated on all shards.