Question 298 of 997

Develop for Azure storage →mediumMultiple ChoiceObjective-mapped

AZ-204 Develop for Azure storage Practice Question

This AZ-204 practice question tests your understanding of develop for azure storage. 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 are designing an Azure Table Storage table to store temperature readings from IoT devices. Each reading includes a device ID (string), timestamp (datetime), temperature value, and location. You need to optimize the table design for this query: "Retrieve all temperature readings for a specific device ID within a given one-hour time range." The query must be efficient and minimize partition scans. Which PartitionKey and RowKey combination should you use?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

A
PartitionKey = device ID, RowKey = timestamp (formatted as inverted ticks)
All readings for a device are in one partition; the sorted RowKey enables a point query range scan, minimizing partition scans.
B
PartitionKey = timestamp (rolled up to day), RowKey = device ID
Why wrong: This scatters a device’s data across many partitions, requiring a full partition scan for the time range.
C
PartitionKey = location, RowKey = device ID
Why wrong: Queries for a specific device would need to search all partitions that contain that device’s data, inefficient.
D
PartitionKey = device ID + timestamp (composite), RowKey = empty
Why wrong: A composite PartitionKey loses the ability to perform an efficient range query on timestamp within a partition; each combination is a separate partition.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

PartitionKey = device ID, RowKey = timestamp (formatted as inverted ticks)

Option A is correct because using device ID as the PartitionKey ensures all readings for a specific device are in the same partition, allowing efficient point queries. Using timestamp formatted as inverted ticks (e.g., DateTime.MaxValue.Ticks - DateTime.UtcNow.Ticks) as the RowKey enables range queries within a one-hour window by leveraging the lexicographic ordering of RowKey values, minimizing partition scans.

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.

✓
PartitionKey = device ID, RowKey = timestamp (formatted as inverted ticks)
Why this is correct
All readings for a device are in one partition; the sorted RowKey enables a point query range scan, minimizing partition scans.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
PartitionKey = timestamp (rolled up to day), RowKey = device ID
Why it's wrong here
This scatters a device’s data across many partitions, requiring a full partition scan for the time range.
✗
PartitionKey = location, RowKey = device ID
Why it's wrong here
Queries for a specific device would need to search all partitions that contain that device’s data, inefficient.
✗
PartitionKey = device ID + timestamp (composite), RowKey = empty
Why it's wrong here
A composite PartitionKey loses the ability to perform an efficient range query on timestamp within a partition; each combination is a separate partition.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often choose a composite key (Option D) thinking it uniquely identifies rows, but they overlook that Azure Table Storage requires RowKey for range queries, and an empty RowKey prevents efficient filtering within a partition.

Detailed technical explanation

How to think about this question

Azure Table Storage uses a hash of the PartitionKey to distribute data across nodes; thus, a single PartitionKey value ensures all data resides on the same node, enabling fast point and range queries. The inverted ticks technique ensures that more recent timestamps sort first in RowKey order, which is useful for time-series data where you often query the latest readings. A subtle behavior is that RowKey range queries are lexicographic, so using a standard timestamp string (e.g., '2025-03-20T10:00:00') works but inverted ticks provide better performance for descending time queries.

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

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

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this AZ-204 question test?

Develop for Azure storage — This question tests Develop for Azure storage — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: PartitionKey = device ID, RowKey = timestamp (formatted as inverted ticks) — Option A is correct because using device ID as the PartitionKey ensures all readings for a specific device are in the same partition, allowing efficient point queries. Using timestamp formatted as inverted ticks (e.g., DateTime.MaxValue.Ticks - DateTime.UtcNow.Ticks) as the RowKey enables range queries within a one-hour window by leveraging the lexicographic ordering of RowKey values, minimizing partition scans.

What should I do if I get this AZ-204 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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