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. A key principle to apply: the Cosmos DB trigger uses the change feed to detect inserts and updates.. 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.
A serverless app must react whenever audit documents are inserted or updated in Cosmos DB. Which trigger should the Azure Function use? The design must avoid adding custom operational scripts.
Queue trigger
Why wrong: Queue triggers respond to queue messages, not Cosmos DB changes directly.
Timer trigger
Why wrong: A timer trigger runs on a schedule and does not automatically follow the change feed.
HTTP trigger
Why wrong: HTTP triggers require incoming HTTP requests.
Cosmos DB trigger
The Cosmos DB trigger reads the change feed and invokes the function for inserts and updates.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cosmos DB trigger
The Azure Cosmos DB trigger is the correct choice because it natively listens to the Cosmos DB change feed, which captures inserts and updates to documents. This allows the Azure Function to react automatically without any custom scripts or polling logic, aligning with the serverless and operational simplicity requirements.
Key principle: The Cosmos DB trigger uses the change feed to detect inserts and updates.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Queue trigger
Why it's wrong here
Queue triggers respond to queue messages, not Cosmos DB changes directly.
Timer trigger
Why it's wrong here
A timer trigger runs on a schedule and does not automatically follow the change feed.
HTTP trigger
Why it's wrong here
HTTP triggers require incoming HTTP requests.
Cosmos DB trigger
Why this is correct
The Cosmos DB trigger reads the change feed and invokes the function for inserts and updates.
Related concept
The Cosmos DB trigger uses the change feed to detect inserts and updates.
Common exam traps
The trap here is that candidates may confuse the Cosmos DB trigger with other triggers that require custom polling or external invocation, overlooking that the change feed provides a built-in, event-driven mechanism for reacting to data changes.
Detailed technical explanation
The Cosmos DB trigger uses the change feed processor, which polls the change feed of a container via the `_etag` and `_ts` system properties to detect new or modified documents. Under the hood, it leverages the `ChangeFeedOptions` to track a continuation token, ensuring at-least-once delivery and checkpointing for fault tolerance. In a real-world scenario, this is ideal for event-driven architectures like audit logging, where you need to capture every document mutation without manual intervention.
Key takeaway
The Cosmos DB trigger uses the change feed to detect inserts and updates.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. The Cosmos DB trigger uses the change feed to detect inserts and updates. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Review the Cosmos DB trigger uses the change feed to detect inserts and updates., then practise related AZ-204 questions on the same topic to reinforce the concept.
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FAQ
Develop for Azure storage — This question tests Develop for Azure storage — The Cosmos DB trigger uses the change feed to detect inserts and updates..
The correct answer is: Cosmos DB trigger — The Azure Cosmos DB trigger is the correct choice because it natively listens to the Cosmos DB change feed, which captures inserts and updates to documents. This allows the Azure Function to react automatically without any custom scripts or polling logic, aligning with the serverless and operational simplicity requirements.
Review the Cosmos DB trigger uses the change feed to detect inserts and updates., then practise related AZ-204 questions on the same topic to reinforce the concept.
The Cosmos DB trigger uses the change feed to detect inserts and updates.
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Last reviewed: Jun 11, 2026
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