Quick Answer
The answer is UserID, because in Azure Table Storage, the partition key determines how data is physically grouped, and using UserID ensures all preferences for a specific user reside in the same partition, enabling fast point queries with a single partition scan. This design leverages the storage engine’s ability to retrieve an entire partition in one operation, avoiding the cross-partition overhead that would occur if user data were scattered. On the Microsoft Azure Data Fundamentals DP-900 exam, this concept tests your understanding of partition key design for efficient data access—a common trap is choosing Timestamp or a random GUID, which would spread a user’s records across multiple partitions and slow retrieval. Remember the memory tip: “Same key, same partition; different key, slow mission.”
This DP-900 practice question tests your understanding of describe considerations for working with non-relational data on azure. 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.
Your application uses Azure Table storage to store user preferences. You need to retrieve all preferences for a specific user quickly. Which key should you use as the partition key?
Region
Why wrong: Region may not correspond to user identity.
Random GUID
Why wrong: Random GUID scatters data across partitions.
UserID
UserID groups all preferences for a user in one partition.
Timestamp
Why wrong: Timestamp does not group data by user.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
UserID
Option A is correct because using UserID as partition key ensures all data for a user is stored in one partition, enabling fast point queries. Option B is wrong because Timestamp as partition key would scatter user data. Option C is wrong because Region may not group user data. Option D is wrong because random GUID would scatter data.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Region
Why it's wrong here
Region may not correspond to user identity.
Random GUID
Why it's wrong here
Random GUID scatters data across partitions.
UserID
Why this is correct
UserID groups all preferences for a user in one partition.
Related concept
Read the scenario before looking for a memorised answer.
Timestamp
Why it's wrong here
Timestamp does not group data by user.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which DP-900 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.
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FAQ
Describe considerations for working with non-relational data on Azure — This question tests Describe considerations for working with non-relational data on Azure — Read the scenario before looking for a memorised answer..
The correct answer is: UserID — Option A is correct because using UserID as partition key ensures all data for a user is stored in one partition, enabling fast point queries. Option B is wrong because Timestamp as partition key would scatter user data. Option C is wrong because Region may not group user data. Option D is wrong because random GUID would scatter data.
Identify which DP-900 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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This DP-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DP-900 exam.
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