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).
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