Replication with Aurora

• There are several replication options with Aurora.

• Each Aurora DB cluster has built-in replication between multiple DB instances in the same cluster.

Aurora Replicas:

• If the writer instance in a cluster becomes unavailable, Aurora automatically promotes one of the reader instances to take its place as the new writer.

• An Aurora DB cluster can contain up to 15 Aurora Replicas. The Aurora Replicas can be distributed across the Availability Zones that a DB cluster spans within an AWS Region.

• The replication type is asynchronous (milliseconds).

RDS Replicas:

• RDS uses the MariaDB, MySQL, Oracle, PostgreSQL, and Microsoft SQL Server DB engines' built-in replication functionality to create a special type of DB instance called a read replica from a source DB instance.

• The replication type is asynchronous (seconds).