Amazon Relational Database Service (Amazon RDS) Multi-AZ deployments with two readable standbys now supports using AWS Identity and Access Management (IAM) for database authentication. With IAM support, you can now centrally manage access to your RDS Multi-AZ deployments with two readable standbys along with other RDS deployments, instead of managing access individually. In addition, AWS IAM eliminates the need for storing password-based login credentials in the database.
Amazon RDS Multi-AZ deployments with two readable standbys is ideal when your workloads require lower write latency and more read capacity. This deployment option also supports minor version upgrades and system maintenance updates with typically less than one second of downtime when using Amazon RDS Proxy or open source tools such as AWS Advanced JDBC Driver, PgBouncer, or ProxySQL.
To learn more about IAM authentication support, see settings for creating Multi-AZ DB clusters in the Amazon RDS User Guide. For a full list of the Amazon RDS Multi-AZ with two readable standbys regional availability and supported engine versions, see supported Regions and DB engines for Multi-AZ DB clusters in Amazon RDS in the Amazon RDS User Guide.
You can create or update fully managed Amazon RDS Multi-AZ databases with two readable standby instances in the Amazon RDS Management Console.
Source:: Amazon AWS