The answer is to use a point read with the item’s ID and partition key. This is the fastest operation in Cosmos DB for NoSQL because a point read bypasses the query engine entirely, accessing the item directly from the physical partition via its resource ID and partition key hash, resulting in single-digit millisecond latency at the consistency level you choose. On the Microsoft Azure Developer Associate AZ-204 exam, this concept tests your understanding of Cosmos DB’s request unit (RU) cost optimization and the critical difference between point reads and queries—a common trap is assuming a filtered query with a good index is just as fast, but even indexed queries incur query engine overhead and higher RU charges. Remember the memory tip: “Point reads are direct hits; queries are search missions.” For the exam, always choose point reads when you have both the ID and partition key, as they guarantee the lowest latency and cost for single-item lookups.
AZ-204 Practice Question: Connect to and consume Azure services and third-party services
This AZ-204 practice question tests your understanding of connect to and consume azure services and third-party services. 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 develop an app that uses Azure Cosmos DB for NoSQL. The app requires reading a specific item by ID with low latency. You need to ensure the query is as fast as possible. What should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a point read with the item's ID and partition key.
Option A is correct because a point read by ID and partition key is the fastest operation in Cosmos DB, directly accessing the item without query engine overhead. Option B is wrong because cross-partition queries add latency. Option C is wrong because even with indexing, point reads are faster. Option D is wrong because stored procedures run on the server but still involve query processing.
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.
✗
Use a stored procedure that reads the item.
Why it's wrong here
Stored procedures still involve query processing, not as fast as point read.
✗
Use a SQL query filtering by ID without partition key.
Why it's wrong here
Without partition key, it becomes a cross-partition query, slower.
✓
Use a point read with the item's ID and partition key.
Why this is correct
Point reads are the fastest operation in Cosmos DB.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a SQL query with a composite index on ID.
Why it's wrong here
Even with indexes, point reads are faster.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Identify which AZ-204 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.
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a point read with the item's ID and partition key. — Option A is correct because a point read by ID and partition key is the fastest operation in Cosmos DB, directly accessing the item without query engine overhead. Option B is wrong because cross-partition queries add latency. Option C is wrong because even with indexing, point reads are faster. Option D is wrong because stored procedures run on the server but still involve query processing.
What should I do if I get this AZ-204 question wrong?
Identify which AZ-204 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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