Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A global social media startup stores user profiles as JSON documents in Azure Cosmos DB. Their application frequently reads profiles by user ID and also runs queries to find users based on location or interests. The workload is read-heavy with high throughput requirements. The operations team notices that query performance degrades during peak hours. Which action would most effectively improve query performance?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Increase the number of containers
Incorrect. Adding more containers (collections/tables) without changing throughput doesn't increase overall capacity; it might fragment data.
B
Distractor review
Choose a different API (e.g., switch from SQL API to MongoDB API)
Incorrect. The API affects the query language and data model, but does not directly improve throughput availability.
C
Best answer
Increase the provisioned throughput (RU/s)
Correct. Provisioned throughput is the key resource controlling the number of operations per second. Increasing RU/s provides more computational power for queries.
D
Distractor review
Switch to a different Azure region
Incorrect. Changing the region might reduce network latency but does not increase the provisioned throughput allocated to the database.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related DP-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
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Question 2
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Question 3
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Question 4
A data engineer is designing a data lake architecture in Azure. They plan to first ingest raw data from various sources into a landing zone in Azure Data Lake Storage Gen2. Then they will clean, validate, and deduplicate that data in a second zone. Finally, they will create aggregated, business-ready datasets in a third zone for analysts. This layered approach is known as which architecture?
Question 5
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Question 6
A company collects customer feedback forms. Each form contains always-present fields like CustomerID and SubmissionDate, but also a free-text Comments field and optional fields like Rating or ProductCategory that vary between forms. How should this data be classified?
FAQ
Questions learners often ask
What does this DP-900 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Increase the provisioned throughput (RU/s) — Azure Cosmos DB performance is provisioned in Request Units per second (RU/s). Increasing the provisioned throughput (RU/s) allocates more resources to handle the workload, directly improving performance during peak times. Choosing a different API or increasing containers does not directly address throughput. Changing regions affects latency but not the underlying throughput capacity.
What should I do if I get this DP-900 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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