What feature is enhanced in an SAP HANA MDC to increase database isolation?

The enhancement of tenant database isolation in SAP HANA Multitenant Database Containers (MDC) is crucial for increasing database isolation among various tenants. In an MDC environment, multiple databases (tenants) can coexist on the same physical server while remaining logically separate from one another. This isolation is important for maintaining the integrity, security, and performance of each tenant's data.

With enhanced tenant database isolation, each tenant's operations, data, and system resources are more distinctly separated, reducing risks of data leakage or interference from one tenant to another. This is particularly beneficial in a multi-tenant architecture where organizations may be sharing infrastructure but need to ensure that their data is secure from one another. Enhanced isolation helps in achieving compliance with various regulatory requirements and also promotes safer operational practices.

This feature stands out against the other choices: while data encryption protocols, access control mechanisms, and backup and restore functionalities are important for overall data security and management, they do not specifically address the logical separation of data across different tenants in the way that enhanced tenant database isolation does. This makes it a pivotal feature of SAP HANA MDC, specifically designed to cater to the needs of multi-tenant environments.