Database Replication

Summary

Keeping copies of your database on multiple servers — a primary handles writes, replicas handle reads — improving read throughput and providing failover if the primary goes down.

• 1Diagram how a write to the primary eventually appears on a replica.
• 2Learn replication lag and why reads from a replica can occasionally be slightly stale.
• 3Understand the difference between synchronous and asynchronous replication trade-offs.