Which two options are necessary for achieving high availability on OCI?

For achieving high availability on Oracle Cloud Infrastructure (OCI), configuring your database to use Data Guard in another Availability Domain (AD) in Sync mode is essential because it ensures that your data is continuously synchronized between the primary and standby databases. This means that in the event of a failure at the primary site, the standby database can take over with minimal data loss, providing a critical layer of resilience and reliability.

Data Guard's synchronization capabilities provide an automatic and seamless failover process, which is crucial for maintaining uptime of applications that rely on the database. This design for redundancy and failover is a fundamental aspect of high availability architecture within OCI.

Distributing application servers across all ADs within a region complements this by reducing the risk of a single point of failure; however, simply having multiple application servers is not sufficient for high availability without a robust database solution in place. Investments in redundancy at the database level, such as using Data Guard, ensure that data integrity and availability are maintained during outages or failovers.