Linyb Geek Road

Aug 13, 2026 · Databases

Five Levels of Database Write Success: Memory, SSD, Object Store, Majority, Cross‑AZ

The article breaks down five durability tiers for database writes—from in‑memory acknowledgment to cross‑availability‑zone replication—explaining how the point at which success is reported determines latency, fault tolerance, and the hidden coordination work a system must perform.