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.
You need to design a storage solution for a global e-commerce application that requires low-latency access to product catalog data across multiple Azure regions. The data is read-heavy and updates are rare. Which service should you use for the primary data store?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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
Azure Cosmos DB is the correct choice because it provides globally distributed, multi-region writes and reads with turnkey data replication and guaranteed single-digit-millisecond latency at the 99th percentile. Its multi-homing API and automatic failover capabilities make it ideal for a read-heavy, rarely updated global e-commerce catalog that requires low-latency access across multiple Azure regions.
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
Active geo-replication provides read replicas but write failover is manual; not ideal for global read-low write.
✗
Azure Table Storage
Why it's wrong here
Table Storage is not globally distributed by default and has higher latency for cross-region access.
✗
Azure Redis Cache
Why it's wrong here
Redis is a cache, not a durable data store; data loss can occur.
✓
Azure Cosmos DB
Why this is correct
Cosmos DB offers turnkey global distribution with multiple consistency levels and low latency.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a caching layer (Redis) with a globally distributed primary store, or assume that a relational database with geo-replication (Azure SQL) is suitable for any multi-region scenario, ignoring the specific read-heavy, rare-update pattern that Cosmos DB is optimized for.
Detailed technical explanation
How to think about this question
Azure Cosmos DB achieves its low-latency reads through automatic indexing of all data and a multi-master replication protocol that uses a quorum-based commit model. Under the hood, it supports multiple consistency levels (from strong to eventual), allowing you to trade off consistency for latency; for a read-heavy catalog, the 'session' or 'bounded staleness' level often provides the best balance. In a real-world scenario, a global e-commerce platform like ASOS uses Cosmos DB to serve product catalogs across continents, leveraging its turnkey multi-region writes to handle flash sales without downtime.
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 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.
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 — Azure Cosmos DB is the correct choice because it provides globally distributed, multi-region writes and reads with turnkey data replication and guaranteed single-digit-millisecond latency at the 99th percentile. Its multi-homing API and automatic failover capabilities make it ideal for a read-heavy, rarely updated global e-commerce catalog that requires low-latency access across multiple Azure regions.
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.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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