The answer is filtering by PartitionKey eq 'user123' and RowKey eq 'settings' because this combination creates a point query, which is the most efficient operation in Azure Table storage. A point query directly targets a single partition and a specific row, allowing the service to locate the data with minimal latency and throughput cost. In contrast, filtering only by PartitionKey scans the entire partition, while filtering only by RowKey triggers a full table scan, both of which are far less efficient. On the Microsoft Azure Data Fundamentals DP-900 exam, this concept tests your understanding of how Azure Table storage indexes data by PartitionKey and RowKey, and the common trap is assuming any filter on RowKey is efficient without the PartitionKey. Remember the memory tip: “Point to the partition, then the row—that’s the fastest way to go.”
DP-900 Practice Question: Describe considerations for working with non-relational data on Azure
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.
Refer to the exhibit. You are designing an Azure Table storage schema for user settings. The JSON shows a sample entity. Which query will retrieve all settings for user123 efficiently?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Filter by PartitionKey eq 'user123' and RowKey eq 'settings'
Option B is correct because using PartitionKey and RowKey together is a point query, which is the most efficient in Table storage. Option A is wrong because filtering only by PartitionKey scans the entire partition. Option C is wrong because filtering by RowKey without PartitionKey performs a full table scan. Option D is wrong because filtering by both properties with OR is inefficient.
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.
✗
Filter by RowKey eq 'settings'
Why it's wrong here
This requires a full table scan.
✓
Filter by PartitionKey eq 'user123' and RowKey eq 'settings'
Why this is correct
This is a point query, the most efficient.
Related concept
Read the scenario before looking for a memorised answer.
✗
Filter by PartitionKey eq 'user123'
Why it's wrong here
This returns all entities in the partition, not just the settings row.
✗
Filter by PartitionKey eq 'user123' or RowKey eq 'settings'
Why it's wrong here
OR conditions are inefficient and may scan multiple partitions.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
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.
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..
What is the correct answer to this question?
The correct answer is: Filter by PartitionKey eq 'user123' and RowKey eq 'settings' — Option B is correct because using PartitionKey and RowKey together is a point query, which is the most efficient in Table storage. Option A is wrong because filtering only by PartitionKey scans the entire partition. Option C is wrong because filtering by RowKey without PartitionKey performs a full table scan. Option D is wrong because filtering by both properties with OR is inefficient.
What should I do if I get this DP-900 question wrong?
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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