Question: Does DynamoDB support Multi-AZ?

Answer

Yes. DynamoDB automatically stores replicated table data across multiple Availability Zones within its AWS Region. Multi-AZ durability is built into the managed service; you do not enable an optional deployment mode or create zonal replicas yourself.

Applications call the regional DynamoDB endpoint. AWS manages the underlying partitions, storage copies and handling of infrastructure failures. There is no primary database hostname that your application must replace with a secondary hostname after an Availability Zone failure.

This differs from adding global-table replicas. Multi-AZ replication protects against failures within a Region; global tables replicate data between Regions for geographic access and regional resilience. Your application still needs a plan for routing and failover between regional endpoints.

Replication also differs from backup. An accidental deletion or incorrect update is a valid write and can be replicated. Enable point-in-time recovery or on-demand backups when you need to recover previous data.

Use SDK retries with backoff for transient failures, and test your application's recovery behavior. Availability commitments and service-credit conditions are documented in the DynamoDB SLA guide; multi-AZ storage is not a promise that every individual request succeeds.

Source: AWS partition replication.