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System Design · Concept

Read Replicas

Read replicas serve database reads from copies of a write master. They reduce read load on the master, but replication lag and extra operational complexity are trade-offs.

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  • MySQL Write Master
  • Memory Cache
  • Load Balancers
  • Federation
  • Sharding
  • Denormalization
  • SQL Tuning

Source: system-design-primer/solutions/system_design/scaling_aws/README.md at master · donnemartin/system-design-primer · GitHub. Checked 2026-11-03.