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 gaming company is developing a multiplayer online game that requires a low-latency data store for player profiles, inventory, and session state. The data is accessed globally, and the solution must support millions of concurrent players. The company expects write-heavy workloads with occasional reads. The solution must provide single-digit millisecond latency for reads and writes. The company also needs to run analytics on the data to understand player behavior, but analytics queries can tolerate higher latency (minutes). Which Azure data storage solution should the company recommend for the transactional data?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Cosmos DB with multiple write regions
Option B is correct because Azure Cosmos DB with multi-master writes provides global low-latency access and high throughput. Option A is wrong because Azure SQL Database with geo-replication may have higher latency for writes due to replication. Option C is wrong because Azure Redis Cache is a caching layer, not a durable data store. Option D is wrong because Azure Table Storage is not designed for single-digit millisecond latency and global distribution.
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.
✗
Azure SQL Database with active geo-replication
Why it's wrong here
Write latency may be higher due to synchronous replication.
✗
Azure Redis Cache with persistence
Why it's wrong here
Redis Cache is a cache, not a primary data store for durability.
✓
Azure Cosmos DB with multiple write regions
Why this is correct
Provides single-digit ms latency globally with multi-master writes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Table Storage with geo-redundancy
Why it's wrong here
Latency not guaranteed single-digit ms, and no multi-region writes.
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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
Identify which AZ-305 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.
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: Azure Cosmos DB with multiple write regions — Option B is correct because Azure Cosmos DB with multi-master writes provides global low-latency access and high throughput. Option A is wrong because Azure SQL Database with geo-replication may have higher latency for writes due to replication. Option C is wrong because Azure Redis Cache is a caching layer, not a durable data store. Option D is wrong because Azure Table Storage is not designed for single-digit millisecond latency and global distribution.
What should I do if I get this AZ-305 question wrong?
Identify which AZ-305 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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