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Cloud Computing · Intermediate

RDS Multi-AZ

RDS deployment option that maintains a synchronously replicated standby in another AZ with automatic failover.

Definition

In a Multi-AZ DB instance deployment, RDS keeps a synchronous standby that cannot serve reads and fails over automatically, typically within one to two minutes, by updating the DNS endpoint. A Multi-AZ DB cluster deployment uses two readable standbys and offers faster failover.

Example

When the primary's AZ loses power, RDS promotes the standby and the application reconnects using the same endpoint.

Exam tip

Multi-AZ is for high availability, not read scaling; read replicas are for read scaling.

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