To leverage the Oracle restore feature within Nutanix Database Service (NDB) for a Real Application Clusters (RAC) database, the administrator must ensure that the database is registered with NDB prior to initiating the restoration operation. Registration allows NDB to recognize the RAC database, manage its metadata, and perform operations like restore using Time Machine snapshots or backups. Without registration, NDB cannot access the necessary configuration details or protection data, rendering the restore feature unavailable.
Option A (Ensure the database is in a Down state) is incorrect because the database state (Up or Down) is not a prerequisite for initiating a restore; the process handles state transitions.
Option B (Ensure the database is registered with NDB) is correct as registration is the foundational requirement for NDB to manage and restore the RAC database.
Option C (Ensure the database is in an Up state) is incorrect because an Up state is not required; restore can proceed regardless of the current state.
Option D (Ensure more than one node of the RAC is reachable) is incorrect because while RAC node availability is important for HA, it is not a mandatory prerequisite for the restore operation itself.
This ensures the restore process can proceed with the necessary NDB oversight.
References
Nutanix Database Service (NDB) User Guide, Chapter 5: Configuring Time Machines, Section: Restoring RAC Databases
Nutanix Support & Insights, Knowledge Base Article: "Preparing Oracle RAC for Restore in NDB"
Nutanix Certified Professional - Database Automation (NCP-DB) v7.5Blueprint, Section 5: Protect Databases Using Time Machine
