- A
Modify the blue/green deployment configuration to use the same database endpoint for both task sets by updating the environment variables in the task definition before deployment.
Environment variables in the task definition can be changed without modifying the container image. Set the database endpoint to the same value for both blue and green task sets. This is the simplest solution.
- B
Create two separate Amazon RDS databases and use an Amazon Route 53 weighted routing policy to distribute traffic.
Why wrong: This adds complexity and cost. It also means each task set writes to a different database, which is not the desired outcome.
- C
Use an Application Load Balancer (ALB) with stickiness to route each user to the correct task set.
Why wrong: Stickiness doesn't solve the underlying database connection problem; it only keeps a user on the same task set during a session.
- D
Use AWS CloudFormation to create a new database stack for each deployment and update the task definition dynamically.
Why wrong: This is overly complex and unnecessary. The goal is to use the same database, not create a new one for each deployment.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A developer is using AWS CodeDeploy with a blue/green deployment strategy to update an application running on Amazon ECS with the Fargate launch type. After the new (green) task set is created and traffic is shifted to it, users immediately report errors when trying to write data. The developer discovers that the green task set is connecting to a different database than the blue task set. The database endpoints are configured in the ECS task definition. What is the simplest way to prevent this issue in future deployments?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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
Modify the blue/green deployment configuration to use the same database endpoint for both task sets by updating the environment variables in the task definition before deployment.
Option A is correct because the issue stems from the green task set using a different database endpoint than the blue task set, which is configured via environment variables in the ECS task definition. By updating the task definition to use the same database endpoint before deployment, both task sets will connect to the same database, ensuring consistency during the traffic shift. This is the simplest fix as it requires no additional infrastructure or complex routing changes.
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.
- ✓
Modify the blue/green deployment configuration to use the same database endpoint for both task sets by updating the environment variables in the task definition before deployment.
Why this is correct
Environment variables in the task definition can be changed without modifying the container image. Set the database endpoint to the same value for both blue and green task sets. This is the simplest solution.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create two separate Amazon RDS databases and use an Amazon Route 53 weighted routing policy to distribute traffic.
Why it's wrong here
This adds complexity and cost. It also means each task set writes to a different database, which is not the desired outcome.
- ✗
Use an Application Load Balancer (ALB) with stickiness to route each user to the correct task set.
Why it's wrong here
Stickiness doesn't solve the underlying database connection problem; it only keeps a user on the same task set during a session.
- ✗
Use AWS CloudFormation to create a new database stack for each deployment and update the task definition dynamically.
Why it's wrong here
This is overly complex and unnecessary. The goal is to use the same database, not create a new one for each deployment.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think the issue is about traffic routing or session persistence (options B or C), rather than recognizing that the root cause is a configuration mismatch in the task definition environment variables, which is a common oversight in blue/green deployments.
Detailed technical explanation
How to think about this question
In ECS blue/green deployments with CodeDeploy, the task definition is used to launch both the blue and green task sets. If the database endpoint is hardcoded in the task definition as an environment variable, any change to that variable will affect both task sets unless the deployment is carefully managed. Under the hood, CodeDeploy creates a new task set with the updated task definition, so if the endpoint is not explicitly set to the same value, the green task set may use a different endpoint if the task definition was modified. A real-world scenario is when developers update the task definition with a staging database endpoint for testing and forget to revert it to production before deployment, causing the green set to connect to the wrong database.
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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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
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 DVA-C02 question test?
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Modify the blue/green deployment configuration to use the same database endpoint for both task sets by updating the environment variables in the task definition before deployment. — Option A is correct because the issue stems from the green task set using a different database endpoint than the blue task set, which is configured via environment variables in the ECS task definition. By updating the task definition to use the same database endpoint before deployment, both task sets will connect to the same database, ensuring consistency during the traffic shift. This is the simplest fix as it requires no additional infrastructure or complex routing changes.
What should I do if I get this DVA-C02 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: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
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