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Does RDS Support 3-AZ Deployment?

So far, RDS does not support 3-AZ deployment.

A DB instance is the minimum management unit and an independently running database.

Table 1 DB instance types

DB Instance Type

Description

Single

Uses a single-node architecture and is more cost-effective than primary/standby DB instances.

Primary/Standby

Uses an HA architecture with one master node and one slave node.

Read replica

Uses a single-node architecture (without a standby node).

Cluster

Uses the Microsoft Always On architecture with one master node, one slave node, and up to five read-only nodes. It features higher availability, reliability, and scalability.