- A
Azure Cosmos DB with SQL API and multiple write regions
Cosmos DB supports multi-region writes, automatic conflict resolution, global distribution, low latency, and 99.999% availability. It is ideal for globally distributed real-time applications.
- B
Azure SQL Database with active geo-replication
Why wrong: Active geo-replication creates a readable secondary but does not support multi-region writes. Writes go to a single primary, which would introduce latency for remote users.
- C
Azure Table Storage
Why wrong: Azure Table Storage is a NoSQL key-value store with limited indexing and does not support multi-region writes or conflict resolution.
- D
Azure Cache for Redis
Why wrong: Azure Cache for Redis is an in-memory cache, not a fully managed database with durable storage and multi-region write support.
Quick Answer
The answer is Azure Cosmos DB with SQL API and multiple write regions because it is the only fully managed, globally distributed NoSQL database that natively supports multi-region writes with automatic conflict resolution for JSON documents, using a last-writer-wins or custom conflict resolution policy to handle simultaneous updates from different regions. On the AZ-305 exam, this scenario tests your ability to match a real-time collaboration platform’s need for low-latency multi-region writes and guaranteed SLA (99.999% availability) to the correct service, with a common trap being to select Azure SQL Database or Azure Database for PostgreSQL, which lack native multi-region write support. Remember that Cosmos DB’s multi-region writes require the SQL API (or MongoDB API) and that conflict resolution is automatic, not manual. A useful memory tip: think “Cosmos = global collaboration,” and for the exam, always pair “multi-region writes” with “conflict resolution” to rule out other databases.
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 company is building a global real-time collaboration platform. The application data is stored as JSON documents and needs to be available for low-latency reads and writes from multiple geographic regions. The application must support multi-region writes so that users can update data from any region with automatic conflict resolution. The company wants a fully managed database service with a guaranteed SLA for availability and throughput. Which Azure data service should they choose?
Answer choices
Why each option matters
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 SQL API and multiple write regions
Azure Cosmos DB with SQL API and multiple write regions is the correct choice because it is a fully managed, globally distributed NoSQL database that natively supports multi-region writes with automatic conflict resolution. It provides low-latency reads and writes from any region, a guaranteed SLA for availability (99.999% for multi-region writes) and throughput, and is optimized for JSON document storage, making it ideal for a real-time collaboration platform.
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 with SQL API and multiple write regions
Why this is correct
Cosmos DB supports multi-region writes, automatic conflict resolution, global distribution, low latency, and 99.999% availability. It is ideal for globally distributed real-time applications.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure SQL Database with active geo-replication
Why it's wrong here
Active geo-replication creates a readable secondary but does not support multi-region writes. Writes go to a single primary, which would introduce latency for remote users.
- ✗
Azure Table Storage
Why it's wrong here
Azure Table Storage is a NoSQL key-value store with limited indexing and does not support multi-region writes or conflict resolution.
- ✗
Azure Cache for Redis
Why it's wrong here
Azure Cache for Redis is an in-memory cache, not a fully managed database with durable storage and multi-region write support.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse active geo-replication in Azure SQL Database (which supports only single-region writes) with true multi-region write support, leading them to choose Option B despite its read-only secondary regions.
Detailed technical explanation
How to think about this question
Cosmos DB uses a multi-master replication protocol that allows any region to accept writes, with automatic conflict resolution via last-writer-wins (LWW) or custom conflict resolution policies. Under the hood, it leverages a globally distributed set of replicas and a quorum-based commit protocol to ensure consistency levels (e.g., eventual, session, or strong) while maintaining low-latency reads and writes. In a real-world scenario, a collaboration platform like Microsoft Teams uses Cosmos DB to handle concurrent edits from users worldwide, relying on its conflict resolution to merge changes seamlessly.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Design data storage solutions — study guide chapter
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Design data storage solutions practice questions
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FAQ
Questions learners often ask
What does this AZ-305 question test?
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 SQL API and multiple write regions — Azure Cosmos DB with SQL API and multiple write regions is the correct choice because it is a fully managed, globally distributed NoSQL database that natively supports multi-region writes with automatic conflict resolution. It provides low-latency reads and writes from any region, a guaranteed SLA for availability (99.999% for multi-region writes) and throughput, and is optimized for JSON document storage, making it ideal for a real-time collaboration platform.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
4 more ways this is tested on AZ-305
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A global e-commerce company runs a product catalog application that requires low-latency reads and writes from multiple geographic regions. The data is key-value structured and must be replicated with multi-region write capability. The company needs a fully managed NoSQL database service with guaranteed 99th percentile latency and automatic conflict resolution. Which Azure data service should they choose?
medium- ✓ A.Azure Cosmos DB
- B.Azure Table Storage
- C.Azure Redis Cache
- D.Azure SQL Database
Why A: Azure Cosmos DB is the correct choice because it is a fully managed NoSQL database that supports multi-region writes with automatic conflict resolution, guarantees 99th percentile latency, and provides low-latency reads and writes globally. Its multi-master replication and tunable consistency models meet the key-value structured data requirements and the need for high availability across geographic regions.
Variation 2. A company runs a global e-commerce application that needs to store product catalog data. The data is JSON documents with variable schemas. The application requires single-digit millisecond read and write latencies at any scale and must support automatic synchronous replication across multiple Azure regions for high availability and low latency reads from any region. Which Azure data service should they choose?
easy- A.Azure SQL Database with active geo-replication
- ✓ B.Azure Cosmos DB with multi-region writes
- C.Azure Table Storage
- D.Azure Database for PostgreSQL with read replicas
Why B: Azure Cosmos DB with multi-region writes is the correct choice because it natively supports JSON documents with variable schemas, guarantees single-digit millisecond read and write latencies at any scale via its multi-homing API, and provides automatic synchronous replication across multiple Azure regions with active-active configurations. This ensures high availability and low-latency reads from any region without manual failover or data loss.
Variation 3. 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?
medium- A.Azure SQL Database with active geo-replication
- B.Azure Table Storage
- C.Azure Redis Cache
- ✓ D.Azure Cosmos DB
Why D: 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.
Variation 4. A company is designing a data storage solution for a globally distributed application that requires low-latency read access to frequently accessed data and high throughput for write operations. The data is non-relational and can be stored as key-value pairs. Which Azure service should they use?
easy- A.Azure Table Storage
- ✓ B.Azure Cosmos DB
- C.Azure SQL Database
- D.Azure Blob Storage
Why B: Azure Cosmos DB is the correct choice because it is a globally distributed, multi-model database service that provides guaranteed low-latency reads (under 10 ms at the 99th percentile) and high throughput for write operations, with automatic indexing and turnkey global distribution. It natively supports key-value data models, making it ideal for non-relational, frequently accessed data requiring consistent performance across regions.
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Last reviewed: Jun 11, 2026
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