This Guidance helps customers set up high availability for Oracle databases using Amazon RDS Custom for Oracle service, a managed cloud data service that makes it easier to operate and scale relational databases. It addresses the challenges for those who want to utilize Amazon RDS Custom for Oracle, but don't have an automated way to implement those instances. This hinders their ability to meet application service level agreements and requires manually configuring high availability instances. This Guidance can help customers streamline their high availability setup, offload complex configuration tasks, and ensure maximum availability, thanks to the integration of Oracle Data Guard with Fast-Start Failover monitoring.