The answer is multi-region writes. This is correct because Azure Cosmos DB achieves high availability by allowing you to write data to multiple Azure regions simultaneously, which ensures that if one region fails, your application can continue writing to another region without interruption. Additionally, automatic failover is a key supporting feature that redirects read and write traffic to a healthy region when a regional outage occurs. On the DP-900 exam, this topic tests your understanding of how Cosmos DB differs from traditional databases—many candidates mistakenly think point-in-time restore or change feed are high availability features, but those are for backup and event-driven processing, not for keeping the database continuously accessible. A common trap is confusing disaster recovery with high availability; remember that high availability is about minimizing downtime during failures, not recovering from data loss. Memory tip: think "multi-region writes" as "always-on writes" for instant failover.
DP-900 Practice Question: Describe considerations for working with non-relational data on Azure
This DP-900 practice question tests your understanding of describe considerations for working with non-relational data on azure. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO of the following are features of Azure Cosmos DB that help ensure high availability?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Automatic failover
Cosmos DB supports multi-region writes and automatic failover for high availability. Point-in-time restore and change feed are features but not directly for high availability.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Data encryption at rest
Why it's wrong here
Encryption at rest is for security, not availability.
✗
Change feed
Why it's wrong here
Change feed captures changes but does not directly provide high availability.
✓
Automatic failover
Why this is correct
Automatic failover ensures continuity if a region fails.
Related concept
Read the scenario before looking for a memorised answer.
✗
Point-in-time restore
Why it's wrong here
Point-in-time restore is for recovery from accidental deletion, not for high availability.
✓
Multi-region writes
Why this is correct
Multi-region writes allow data to be written to multiple regions, improving availability.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
Identify which DP-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Describe considerations for working with non-relational data on Azure — This question tests Describe considerations for working with non-relational data on Azure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Automatic failover — Cosmos DB supports multi-region writes and automatic failover for high availability. Point-in-time restore and change feed are features but not directly for high availability.
What should I do if I get this DP-900 question wrong?
Identify which DP-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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