Understanding MongoDB’s Replica Sets

As a part of its native replication, MongoDB maintains multiple copies of data in a construct called a replica set.

Replica Sets

So, what is a replica set? A replica set in MongoDB is a group of mongod (primary daemon process for the MongoDB system) process that maintains the same data set. Put simply, it is a group of MongoDB servers operating in a primary / secondary failover fashion. Replica sets provide redundancy and high availability.

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