What database server configuration could you use when deploying the vCenter Server virtual appliance?

When deploying the vCenter Server virtual appliance, the internal Postgres database configuration is the recommended option. The vCenter Server appliance includes an embedded PostgreSQL database, which is specifically optimized for the appliance's requirements. This setup simplifies installation and management since it eliminates the need for external database configurations or complex setups.

Using the internal Postgres database allows for seamless integration, ensuring that operational data is readily available for the vCenter Server without the added complexity of managing an external database instance. Additionally, the embedded solution is tailored for performance and reliability in a virtualized environment, fitting well with vSphere's architecture.

Other options may require additional overhead in terms of setup and maintenance, making the internal Postgres a more efficient and practical choice for most deployments.