AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage solutions. 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.
A global e-commerce company uses Azure Cosmos DB for its product catalog. The write-heavy workload experiences high latency during peak hours. Which design change would most reduce write latency?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable multiple write regions
Enabling multiple write regions allows writes to be accepted by the nearest regional replica, reducing cross-region network latency for write-heavy workloads. This is the most direct architectural change to lower write latency globally, as it avoids the round-trip to a single write region.
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.
✗
Change the default consistency level to eventual
Why it's wrong here
Consistency level affects read latency, not write latency.
✗
Partition the container by a different key
Why it's wrong here
Partition key design affects scalability but not write latency directly.
✓
Enable multiple write regions
Why this is correct
Multiple write regions allow writes to be processed in the nearest region, reducing latency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the request units (RUs) per container
Why it's wrong here
Increasing RUs improves throughput but does not directly reduce write latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse increasing RUs (Option D) as the universal fix for any latency issue, when in fact write latency in a globally distributed scenario is primarily a network distance problem solved by multi-region writes.
Detailed technical explanation
How to think about this question
Multiple write regions in Cosmos DB use a multi-master replication protocol based on the Raft consensus model, where each region accepts writes and asynchronously replicates them to others. This design reduces write latency to single-digit milliseconds for users close to their local region, but introduces potential for conflicts that must be resolved via last-writer-wins (LWW) or custom conflict resolution policies. In a global e-commerce catalog, this is critical because peak-hour latency spikes often stem from geographic distance to the single write region, not from insufficient RUs.
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.
TExam Day Tips
→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
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable multiple write regions — Enabling multiple write regions allows writes to be accepted by the nearest regional replica, reducing cross-region network latency for write-heavy workloads. This is the most direct architectural change to lower write latency globally, as it avoids the round-trip to a single write region.
What should I do if I get this AZ-305 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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