Guided Lab Brief

Database Replication & Read Scaling

Add read replicas to scale database reads and add failover for high availability.

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Overview

Add read replicas to scale database reads and add failover for high availability.

Your single database is the bottleneck.

You will build 6 architecture steps that model production dependencies.

You will run 1 failure experiment to observe bottlenecks and recovery behavior.

Success target: Reads distributed to replicas, primary handles only writes, failover is configured.

Learning Objectives

  • Understand primary-replica replication and read/write splitting
  • Know about replication lag and its impact on consistency
  • Learned about automatic failover for high availability
  • Experienced the performance difference between replicated and non-replicated setups

Experiments

  1. Set readReplicas to 0 on the Primary DB to see the impact of no read scaling

Failure Modes to Trigger

  • Trigger: Set readReplicas to 0 on the Primary DB to see the impact of no read scaling

    Observe: The primary handles all 2000 rps (reads + writes). It becomes the bottleneck, latency increases, and a single failure takes down everything.

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