Multi-AZ deployments for high availability - Amazon Relational Database Service
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Multi-AZ deployments for high availability

Multi-AZ deployments can have one standby or two standby DB instances. When the deployment has one standby DB instance, it's called a Multi-AZ DB instance deployment. A Multi-AZ DB instance deployment has one standby DB instance that provides failover support, but doesn't serve read traffic. When the deployment has two standby DB instances, it's called a Multi-AZ DB cluster deployment. A Multi-AZ DB cluster deployment has standby DB instances that provide failover support and can also serve read traffic.

Note

Multi-AZ DB clusters are in preview for RDS for MySQL and RDS for PostgreSQL and are subject to change.