System Design Aug 19, 2026 3 min read
PostgreSQL and MySQL Replication and Failover Explained
Separate replication, apply, promotion, fencing, client routing, consistency, and ambiguous write evidence across both engines.
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Replication
2 articles with this tag. Follow these related notes when you want a narrower study path.
System Design Jul 25, 2026 9 min read
Database Read Replicas Explained
Learn how database read replicas work, where replica lag breaks correctness, and how to route reads safely in Spring and Node.js services.