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You are designing a solution that needs to react to changes in an Azure Cosmos DB container in real-time. Whenever a new document is inserted or updated, a downstream service must be triggered to process the change. You want to build a serverless solution that reliably captures each change exactly once. Which Azure Cosmos DB feature should you use?

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You are designing a solution that needs to react to changes in an Azure Cosmos DB container in real-time. Whenever a new document is inserted or updated, a downstream service must be triggered to process the change. You want to build a serverless solution that reliably captures each change exactly once. Which Azure Cosmos DB feature 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

Stored procedures

Stored procedures are JavaScript functions that execute within the database engine. They cannot directly call external services.

B

Distractor review

T-SQL queries

T-SQL queries are used for querying data, not for reacting to changes in real-time.

C

Best answer

Change feed

The change feed provides a sequential log of changes to items in a container. Azure Functions can bind to the change feed to trigger on each change, enabling reliable real-time processing.

D

Distractor review

Triggers

Cosmos DB triggers are pre- or post-triggers that run as part of the transaction on a single item. They cannot call external services and are not designed for event-driven workflows.

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

Practise AZ-204 questions linked to AZ-204 fundamentals.

AZ-204 scenario practice questions

Practise AZ-204 questions linked to AZ-204 scenario.

AZ-204 troubleshooting practice questions

Practise AZ-204 questions linked to AZ-204 troubleshooting.

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.

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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: Change feed — The change feed in Azure Cosmos DB is a persistent log of changes (inserts and updates) in the order they occur. You can process it using Azure Functions with a Cosmos DB trigger, which provides at-least-once delivery. Stored procedures (A) run inside the database and cannot trigger external services. T-SQL queries (B) are for SQL API but not for real-time change detection. Triggers (D) in Cosmos DB are pre- or post-operations that execute in the same transaction, not suited for external service invocation.

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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