Can I Change the Replication Mode Between RDS for MySQL Primary Instances and Read Replicas?

Using the native MySQL replication, RDS for MySQL synchronizes changes made to a primary instance to all its associated read replicas. The synchronization is not affected by network latency. Even if a DB instance does not have a primary key ID, its data is synchronized to the associated read replicas.

The replication mode displayed on the RDS console indicates the data synchronization method between primary and standby DB instances. Semi-synchronous (default) and asynchronous are both supported. The semi-synchronous mode is more secure but the asynchronous mode improves performance.

The default synchronization between primary DB instances and read replicas is asynchronous and cannot be changed.