PostgreSQL Replication
PostgreSQL Replication is a feature that allows data from one PostgreSQL database server (the primary) to be copied to one or more other servers (replicas) to ensure high availability, load balancing, and data redundancy. It supports various replication methods, including streaming replication for real-time data copying and logical replication for selective data replication. This enables scenarios like failover, read scaling, and geographic distribution of data.
Developers should learn PostgreSQL Replication when building systems requiring high availability, such as e-commerce platforms or financial applications, to minimize downtime during server failures. It's also essential for scaling read-heavy workloads by offloading queries to replicas, and for data backup and disaster recovery strategies. Use cases include setting up hot standby servers, distributing data across regions, and enabling analytics on separate replicas without impacting the primary database.