Nutanix Database Service (NDB) supports high availability (HA) instances for certain relational database management systems (RDBMS). Among the listed options, NDB natively supports Oracle and PostgreSQL for HA configurations, enabling features like replication and failover. These databases are well-integrated with NDB’s Time Machine and HA frameworks.
Option A (MongoDB) is incorrect because MongoDB is a NoSQL database, not an RDBMS, and is not supported for HA instances in NDB.
Option B (MariaDB) is incorrect because, while MariaDB is an RDBMS, it is not currently supported for HA instances in NDB v7.5.
Option C (Oracle) is correct as NDB supports Oracle in HA mode with features like Data Guard integration.
Option D (PostgreSQL) is correct as NDB supports PostgreSQL HA with streaming replication.
Note: The typo "PostgreSGL" in the question is assumed to mean "PostgreSQL" based on context.
References
Nutanix Database Service (NDB) User Guide, Chapter 4: Managing Database Engines, Section: Supported RDBMS for HA
Nutanix Certified Professional - Database Automation (NCP-DB) v7.5Blueprint, Section 4: Manage Database Engines
