A database administrator implements 'disk mirroring' (RAID 1). Which availability risk does this primarily mitigate?

Answer options:

Accidental deletion of a table by a user.

Ransomware encryption of the database.

Hardware failure of a single hard drive.

Data center power outage.

How to approach this question

Understand what RAID/Mirroring does: redundancy of hardware.

Full Answer

C.Hardware failure of a single hard drive.✓ Correct

Hardware failure of a single hard drive.

Disk mirroring writes data to two physical disks simultaneously. If one drive fails, the system continues to operate using the other drive. It does NOT protect against logical errors (deletion, corruption) because those are mirrored too.

Common mistakes

Thinking RAID is a backup strategy. It is not.

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