Introduction:

• Ensuring data availability and reliability is crucial in the dynamic world of centralized database management.
• This issue is addressed by MongoDB, a flexible NoSQL database solution because of its strong replication system. The whole package of preserving data integrity, high availability, and effective scaling is MongoDB replication.
• This solution not only protects against hardware failures and data loss but also improves read scalability and facilitates geographically distributed applications by spreading and synchronizing data across multiple nodes.

How it works?

• MongoDB replication is implemented using a structure called a replica set.
• In a replica set, there are two or more MongoDB instances.
• One of them would be a primary and one or more would be the secondaries. The primary node is the primary source of truth for data modifications, handling all write operations from the users. Secondary nodes replicate data from the primary node, ensuring that they have a consistent copy of the primary data.