Why Replicas Don’t Fix Every Database Failure

A database outage hit production → Add a replica.
System slowing down → Add more servers.
Queries are slow → Add an index.

But here’s the trap: quick fixes don’t always solve the root cause.

In this video, I share a real-world case where a team added a replica after a database outage caused by disk failure — but the real problem stayed unsolved.

You’ll learn:
✅ Why replicas aren’t a silver bullet for availability
✅ How root cause analysis beats quick fixes
✅ A real-world WAL corruption case and what we did instead
✅ Practical lessons for long-term database reliability

If you work with PostgreSQL, MySQL, or any production DB system, this video will help you think beyond surface-level fixes.

📌 Watch till the end for key lessons learned on balancing cost, complexity, and high availability.

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Is Adding a Replica Always the Right Fix?: https://medium.com/gitconnected/database-outage-is-adding-a-replica-always-the-right-fix-76de6f2e3b10
WAL segment corruption: https://medium.com/@anasanjaria/improving-postgres-replication-our-dedicated-disk-move-0b50dd48db8d

Видео Why Replicas Don’t Fix Every Database Failure канала Anas Anjaria