MongoDB Replication
MongoDB Replication is a feature that creates and maintains multiple copies of data across different servers, known as replica sets, to ensure high availability and data redundancy. It uses a primary-secondary architecture where the primary node handles all write operations and replicates data to secondary nodes, which can serve read operations and provide failover support. This mechanism helps prevent data loss and minimizes downtime in case of server failures.
Developers should use MongoDB Replication when building applications that require high availability, fault tolerance, and data durability, such as e-commerce platforms, financial systems, or real-time analytics. It is essential for production environments where downtime or data loss is unacceptable, as it enables automatic failover and load balancing for read-heavy workloads. Learning this skill is crucial for database administrators and backend developers working on scalable, mission-critical systems.