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mediummultiple choiceObjective-mapped

Your IoT solution generates billions of small telemetry entries (each ~100 bytes). Data is written once and rarely updated. You need to run analytical queries on the last 30 days of data daily, scanning large ranges by timestamp, requiring sub-second response times. You want the lowest storage cost. Which Azure Storage solution should you use?

Question 1mediummultiple choice
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Your IoT solution generates billions of small telemetry entries (each ~100 bytes). Data is written once and rarely updated. You need to run analytical queries on the last 30 days of data daily, scanning large ranges by timestamp, requiring sub-second response times. You want the lowest storage cost. Which Azure Storage solution should you use?

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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

Azure Blob Storage

Blob Storage is designed for unstructured data like images or logs, not for fast analytical queries on structured telemetry data.

B

Best answer

Azure Table Storage

Table Storage is a NoSQL key-value store that handles massive amounts of structured data with low cost and supports fast range queries on RowKey, making it ideal for time-series telemetry.

C

Distractor review

Azure Cosmos DB

Cosmos DB offers lower latency and richer query capabilities but at a significantly higher cost compared to Table Storage, which is unnecessary for this scenario.

D

Distractor review

Azure Data Lake Storage

Data Lake Storage is optimized for big data analytics and large files, not for sub-second queries on small individual telemetry entries.

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 AZ-204 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

AZ-204 fundamentals practice questions

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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

You are developing a web app that authenticates users via Microsoft Entra ID. The app needs to read the user's profile and send emails on their behalf. You want to minimize user consent prompts. Which OAuth 2.0 grant type should you use?

Question 5

You are developing an Azure Function that processes messages from an Azure Service Bus queue. The function uses a Service Bus queue trigger and runs on a Consumption Plan. The queue receives a high volume of messages in bursts. You need to ensure that the function scales out to handle the load but does not exceed 10 concurrent instances. Which configuration should you apply?

Question 6

You are monitoring an Azure App Service using Application Insights. You notice that the server response time is high for certain requests. You need to drill down to see which external dependencies (like databases or APIs) are causing the delay. Which Application Insights feature should you use?

FAQ

Questions learners often ask

What does this AZ-204 question test?

Read the scenario before looking for a memorised answer.

What is the correct answer to this question?

The correct answer is: Azure Table Storage — Azure Table Storage is designed for storing large amounts of structured, non-relational data at low cost. It supports efficient range queries using PartitionKey and RowKey (e.g., timestamp range) and can achieve sub-second latency for such scans. Blob Storage is cost-effective but not optimized for analytical queries on structured data. Cosmos DB provides lower latency but at higher cost. Azure Data Lake Storage is intended for big data analytics and is not cost-optimal for sub-second queries on small telemetry data.

What should I do if I get this AZ-204 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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