MongoDB Recipes: With Data Modeling and Query Building Strategies

© Subhashini Chellappan and Dharanitharan Ganesan 2020

S. Chellappan, D. GanesanMongoDB Recipeshttps://doi.org/10.1007/978-1-4842-4891-1_5

5. Replication and Sharding

Subhashini Chellappan¹  and Dharanitharan Ganesan²

(1)

Bangalore, India

(2)

Krishnagiri, Tamil Nadu, India

 

In Chapter 4, we discussed various indexes in MongoDB. In this chapter, we cover the following topics:

• Replication.

• Sharding.

Replication

Replication is the process of creating and managing a duplicate version of a database across servers to provide redundancy and increase availability of data.

In MongoDB, replication is achieved with the help of a replica set, a group of mongod instances that maintain the same data set. A replica set contains one primary node that is responsible for all ...