1Z0-1085-26 Getting Started With Oci Practice Question
An application administrator is configuring a high-availability database cluster across three Fault Domains in a single Availability Domain. During a scheduled infrastructure maintenance event affecting Fault Domain 1, the administrator notices that one of the database nodes becomes unreachable. What is the expected behavior of OCI Fault Domains in this scenario?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Only instances in Fault Domain 1 are impacted by the maintenance, while instances in Fault Domains 2 and 3 continue to run normally without disruption.
Fault domains are isolated hardware and power groupings. Maintenance events or hardware failures impact only the specific Fault Domain being maintained, leaving other Fault Domains unaffected.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The database cluster automatically fails over its primary role to an instance in a different Availability Domain.
Why it's wrong here
Fault domains exist within the same Availability Domain, so failover happens locally among the remaining FDs unless a multi-AD architecture was explicitly configured.
- ✓
Only instances in Fault Domain 1 are impacted by the maintenance, while instances in Fault Domains 2 and 3 continue to run normally without disruption.
Why this is correct
Fault Domains provide anti-affinity and fault isolation so that infrastructure failures or maintenance in one FD do not affect others.
- ✗
The entire Availability Domain is taken offline to synchronize the maintenance state across all Fault Domains.
Why it's wrong here
Maintenance is applied on a per-fault-domain basis to prevent taking down the entire Availability Domain.
- ✗
Instances in Fault Domain 1 are automatically migrated to Fault Domain 2, causing a brief network partition.
Why it's wrong here
OCI does not automatically migrate running instances between fault domains during maintenance.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Oracle exam blueprint
This 1Z0-1085-26 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-1085-26 exam.