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Topic starter
18/07/2026 9:37 am
Multi-AZ means your app's compute and data are mirrored across physically separate data centers (Availability Zones) within a region. If one AZ burns down or has a power failure, your app fails over to another AZ.
For your uptime:
* It protects against datacenter-level failures. Not your buggy code.
* Failover is automatic, but not instant. Expect minutes of downtime during a real AZ outage.
* Your app needs to be built for it. Just deploying to multi-AZ won't help if your database can't handle the replication or your app can't reconnect.
It's about reducing single points of failure. Don't expect 100% uptime.