What key feature of Oracle Autonomous Database contributes to data availability?

Multi-tenant architecture is a key feature of Oracle Autonomous Database that significantly contributes to data availability. This architecture allows for the efficient sharing of resources across multiple databases that can operate independently within the same database environment. It means that even if one tenant experiences an issue, others remain unaffected, thereby maintaining accessibility and continuity of service.

Furthermore, this architecture supports features like automated patching and upgrades without downtime, ensuring that the system remains available to users. Multi-tenancy also allows for efficient resource management and scaling, making it easier to handle load spikes and ensuring that data remains accessible even during peak usage times.

In contrast, while redundant storage solutions can enhance data availability, they are not the defining characteristic of Autonomous Database’s architecture. Cloud elasticity primarily relates to resource allocation and the ability to scale up or down based on demand, rather than specifically enhancing availability. Lastly, a single-instance architecture does not offer the same level of resilience and fault tolerance as multi-tenant architecture, where resources are pooled and utilized in a manner that safeguards against individual instance failures.