Why is hypervisor high availability an essential component of a production database server?

In environments where the database server (running on a VM) supports critical, stateless components such as Delivery Controllers, hypervisor high availability ensures that the database VM remains accessible and operational. This prevents a single host failure from rendering the database unavailable, which would severely impact the functionality of dependent stateless services.

While hypervisor high availability allows for performing server maintenance online through features like live migration, this is a beneficial capability rather than the primary reason for its essentiality in ensuring the availability of a critical database for dependent stateless components.

Hypervisor high availability protects the availability of the virtual machine and the services it hosts, but it does not directly prevent local host cache corruption, which is an application-level caching mechanism.

Hypervisor high availability ensures the database server VM remains operational, but it does not directly prevent user data loss if a session is disconnected, which is typically handled by application-level session management and data persistence solutions.