Azure Cosmos DB is the correct choice because it is a globally distributed JSON database with tunable consistency, purpose-built for semi-structured documents and low-latency reads across multiple regions. Its multi-master replication protocol allows you to dial between five well-defined consistency levels—from strong to eventual—ensuring that a healthcare analytics platform can balance data freshness with performance, typically achieving sub-10 millisecond reads at the 99th percentile. On the AZ-305 exam, this scenario tests your ability to match workload requirements to the right data store, with a common trap being to confuse Cosmos DB with Azure SQL Database or Table Storage, which lack native JSON support and global multi-region writes. Remember the mnemonic “GJ-TC” for Globally distributed JSON with Tunable Consistency—if the question mentions semi-structured data, global scale, and adjustable consistency, Cosmos DB is the only service that checks all three boxes.
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 healthcare analytics platform stores semi-structured JSON documents and requires globally distributed low-latency reads with tunable consistency. Which Azure data platform should be recommended?
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 natively supports semi-structured JSON documents, offers globally distributed multi-region writes and reads with low-latency (typically <10 ms at the 99th percentile), and provides tunable consistency levels (from strong to eventual) via its multi-master replication protocol. This directly matches the requirements for a healthcare analytics platform needing global distribution and flexible consistency.
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 Cosmos DB
Why this is correct
Cosmos DB provides globally distributed NoSQL APIs, tunable consistency, and low-latency reads.
Related concept
Read the scenario before looking for a memorised answer.
Data Factory orchestrates data movement and transformation, not operational document storage.
✗
Azure SQL Managed Instance
Why it's wrong here
SQL Managed Instance is relational and not the best fit for globally distributed JSON document workloads.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure SQL Managed Instance's JSON support (which can store JSON as text but lacks native document indexing and global distribution) with a true document database, or they mistakenly think Azure Files can serve as a document store because it supports file-based access, ignoring the need for queryable semi-structured data and tunable consistency.
Detailed technical explanation
How to think about this question
Cosmos DB uses a multi-master replication protocol based on the Paxos consensus algorithm for strong consistency and a quorum-based approach for bounded staleness, session, consistent prefix, and eventual consistency. Under the hood, each request is routed to the nearest region via Azure Traffic Manager, and the consistency level is enforced at the SDK level by reading from the appropriate replica set. In a real-world healthcare scenario, this allows patient analytics data to be written in one region and read with session consistency in another, ensuring a user always sees their own writes without global latency.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 natively supports semi-structured JSON documents, offers globally distributed multi-region writes and reads with low-latency (typically <10 ms at the 99th percentile), and provides tunable consistency levels (from strong to eventual) via its multi-master replication protocol. This directly matches the requirements for a healthcare analytics platform needing global distribution and flexible consistency.
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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