Primary-Replica

Primary-Replica is a database architecture pattern where one primary node handles all write operations and replicates data to one or more replica nodes for read operations. This setup ensures high availability, fault tolerance, and load balancing by distributing read queries across replicas. It is commonly used in distributed systems to improve performance and reliability.

Also known as: Master-Slave, Leader-Follower, Primary-Secondary, Active-Passive, Source-Replica

Why learn Primary-Replica?

Developers should learn and use Primary-Replica when building scalable applications that require high read throughput and data redundancy, such as e-commerce platforms or content delivery networks. It is essential for systems where downtime is unacceptable, as replicas can take over if the primary fails, ensuring continuous service availability.

Learning Resources

• docs: Database Replication Concepts
• tutorial: High Availability with Primary-Replica
• course: Distributed Systems Course
• video: Primary-Replica Pattern Explained