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.
Which TWO of the following are benefits of using Azure Cosmos DB for a globally distributed application?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Multiple consistency models to choose from
Azure Cosmos DB offers multiple well-defined consistency models (strong, bounded staleness, session, consistent prefix, and eventual) that allow developers to balance consistency, availability, and latency according to application needs. This is a key benefit for globally distributed applications because it enables tuning data guarantees across regions without sacrificing performance.
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.
✗
Support for foreign key constraints across containers
Why it's wrong here
Cosmos DB does not support foreign keys.
✓
Multiple consistency models to choose from
Why this is correct
Cosmos DB offers five consistency levels.
Related concept
Read the scenario before looking for a memorised answer.
✗
Built-in support for transactional replication
Why it's wrong here
Cosmos DB uses multi-master replication, not transactional replication.
✗
Native support for SQL Server stored procedures
Why it's wrong here
Cosmos DB uses JavaScript for stored procedures, not T-SQL.
✓
Automatic indexing of all data
Why this is correct
Cosmos DB indexes all data by default.
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 confuse Cosmos DB's JavaScript-based stored procedures with SQL Server stored procedures, or assume that a globally distributed NoSQL database would support foreign keys or transactional replication like a traditional relational database.
Detailed technical explanation
How to think about this question
Cosmos DB's automatic indexing indexes every property of every item by default, which eliminates the need for manual index management and ensures efficient queries across all fields. Under the hood, the indexing engine uses a inverted tree structure and supports composite indexes for complex query patterns, but automatic indexing can be tuned by excluding specific paths to reduce RU consumption in high-throughput scenarios.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: Multiple consistency models to choose from — Azure Cosmos DB offers multiple well-defined consistency models (strong, bounded staleness, session, consistent prefix, and eventual) that allow developers to balance consistency, availability, and latency according to application needs. This is a key benefit for globally distributed applications because it enables tuning data guarantees across regions without sacrificing performance.
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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