YugabyteDB and Oracle offer different approaches to achieving high availability (HA) and scalability in databases. YugabyteDB is a single, coherent database distributed across multiple servers, built on the Raft protocol for resilience and scalability. It provides cloud-native resiliency, backup, bronze-level HA, silver-level DR, gold-level multi-master capabilities, and platinum-level protection with minimal complexity and cost. In contrast, Oracle offers various MAA levels (bronze to platinum) with different features such as RMAN, RAC, Data Guard, and GoldenGate for achieving HA and scalability. When comparing the two, YugabyteDB's built-in replication, sharding, and clustering capabilities simplify setup and provide high availability without additional complexity or cost. Oracle's MAA levels require more configuration and licensing, with some features only available in specific scenarios. Ultimately, YugabyteDB provides PostgreSQL compatibility and all of Oracle's HA features as part of its core, making it a viable alternative for cloud-native applications requiring high availability and scalability.