Can Primary and Standby RDS DB Instances Be Deployed in the Same AZ?
An AZ is a physical region where resources use independent power supply and networks. AZs are physically isolated but interconnected through an internal network. Some regions support both single AZs and multiple AZs and some only support single AZs.
To achieve higher reliability, RDS will automatically deploy your primary and standby instances in different physical servers even if you deploy primary and standby DB instances in the same AZ. If you attempt to create primary/standby DB instances in the same AZ in a Dedicated Computing Cluster (DCC) and there is only one physical server available, the creation will fail.
RDS allows you to deploy primary/standby DB instances in an AZ or across AZs. You can determine whether the standby AZ is the same as the primary AZ.
- If they are the same (default setting), the primary and standby DB instances are deployed in the same AZ.
- If they are different, the primary and standby DB instances are deployed in different AZs to ensure failover support and high availability.
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