Database Replication for System Design #4 | Replication, Scaling & Consistency

Database Replication in System Design | System Design Basics Database replication is one of the most important concepts in system design and backend engineering. In this video, we learn how database replication works, why distributed systems use replicas, and how replication helps improve high availability, read scalability, and disaster recovery. We’ll cover: • What is Database Replication? • Why do we replicate databases? • High Availability with database replicas • Read Scalability and distributing read traffic • Primary database and replica databases • How database replication works • Replication Lag and its impact • Database replication and consistency • Synchronous vs Asynchronous Replication • Advantages and disadvantages of synchronous replication • Advantages and disadvantages of asynchronous replication • The trade-off between consistency, performance, and availability Understanding database replication is essential for system design interviews, backend development, distributed systems, and building scalable applications. If you're learning System Design from scratch, this video is part of a practical database and system design series covering the fundamentals you need to design scalable backend systems. 🔔 Subscribe for more videos on System Design, Backend Engineering, Databases, Distributed Systems, APIs, and Software Architecture. #SystemDesign #DatabaseReplication #DistributedSystems