Question 949 of 997

Develop for Azure storage →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct choice is Append blobs with each log entry written as an append block, because Append blobs are purpose-built for high-throughput append operations, allowing you to stream millions of small 200-byte log records every second into a single file without overwriting existing data. This design maximizes write throughput by leveraging the blob’s internal append-only mechanism, which avoids the overhead of managing multiple blobs or page-aligned writes, and minimizes storage costs by consolidating all logs into one blob rather than fragmenting them across many objects. On the AZ-204 exam, this scenario tests your understanding of Azure Blob Storage types and their specific use cases—a common trap is choosing Block blobs for sequential writes, but Block blobs require staging and committing blocks, which adds latency for frequent small appends. Remember the memory tip: “Append blobs for endless logs, Block blobs for chunks you must unlock.”

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 a solution that writes millions of small log records (each 200 bytes) to Azure Blob Storage. The logs are written every second, always appended to a single file. The file must be read periodically by a batch process that reads the entire file. You need to maximize write throughput and minimize storage costs. Which blob type and access strategy should you choose?

Clue words in this question

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

Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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.

Question 1hardmultiple choice

Full question →

A
Use Block blobs and append the data to a single blob
Why wrong: Block blobs are not designed for append-heavy workloads; each append requires a commit, and small blocks lead to high transaction costs and potential performance issues.
B
Use Append blobs and write each log entry as an append block
Append blobs are optimized for sequential appends, providing high throughput and low cost for small append operations.
C
Use Page blobs and write each log entry to a page
Why wrong: Page blobs are for frequent read/write of random data, have higher cost, and are not efficient for append-only logs.
D
Use Block blobs and create a new blob for each log entry
Why wrong: Creating thousands of small blobs increases management overhead and transaction costs, and reduces write throughput.

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

✓

Use Append blobs and write each log entry as an append block

Append blobs are optimized for append operations, making them ideal for writing millions of small log records sequentially to a single file. Each log entry is written as an append block, which provides high throughput for append-heavy workloads. Append blobs also minimize storage costs because they store data in a single blob without the overhead of managing multiple blobs or pages.

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.

✗
Use Block blobs and append the data to a single blob
Why it's wrong here
Block blobs are not designed for append-heavy workloads; each append requires a commit, and small blocks lead to high transaction costs and potential performance issues.
✓
Use Append blobs and write each log entry as an append block
Why this is correct
Append blobs are optimized for sequential appends, providing high throughput and low cost for small append operations.
Clue confirmation
The clue words "always", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Page blobs and write each log entry to a page
Why it's wrong here
Page blobs are for frequent read/write of random data, have higher cost, and are not efficient for append-only logs.
✗
Use Block blobs and create a new blob for each log entry
Why it's wrong here
Creating thousands of small blobs increases management overhead and transaction costs, and reduces write throughput.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often choose Block blobs (Option A) thinking they can append data by adding new blocks, but they overlook the inefficiency of the block list management and the lack of native append support, which makes Append blobs the correct choice for sequential append workloads.

Detailed technical explanation

How to think about this question

Append blobs use a specialized append block operation that adds data to the end of the blob without modifying existing content, achieving up to 500 append transactions per second per blob. The append block operation is atomic and supports concurrent appends, making it suitable for high-frequency logging scenarios. Under the hood, append blobs maintain a commit log of append positions, ensuring consistency even if the write operation is interrupted.

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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

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: Use Append blobs and write each log entry as an append block — Append blobs are optimized for append operations, making them ideal for writing millions of small log records sequentially to a single file. Each log entry is written as an append block, which provides high throughput for append-heavy workloads. Append blobs also minimize storage costs because they store data in a single blob without the overhead of managing multiple blobs or pages.

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: "always", "minimum / minimize". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 11, 2026

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