- A
Use a higher compute type for the build project.
Why wrong: Faster compute can help but not as much as caching dependencies.
- B
Use a custom AMI with pre-installed dependencies.
Why wrong: CodeBuild uses Docker images, not AMIs.
- C
Increase the timeout value for the build.
Why wrong: Timeout does not reduce build time.
- D
Configure a cache in Amazon S3 for the Maven repository.
Caching dependencies avoids re-downloading them.
Question 423 of 1,616
How to Reduce CodeBuild Build Time by Caching Dependencies
This DVA-C02 practice question tests your understanding of deployment. 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.
A company is using AWS CodeBuild to compile a Java application. The build takes a long time because Maven dependencies are downloaded each time. How can the developer reduce build time?
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
✓
Configure a cache in Amazon S3 for the Maven repository.
Option D is correct because configuring an Amazon S3 cache for the Maven repository allows CodeBuild to reuse previously downloaded dependencies across builds, eliminating the need to re-download them each time. This significantly reduces build time by leveraging the local cache stored in S3, which is a best practice for dependency-heavy builds like Java applications with Maven.
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 a higher compute type for the build project.
Why it's wrong here
Faster compute can help but not as much as caching dependencies.
- ✗
Use a custom AMI with pre-installed dependencies.
Why it's wrong here
CodeBuild uses Docker images, not AMIs.
- ✗
Increase the timeout value for the build.
Why it's wrong here
Timeout does not reduce build time.
- ✓
Configure a cache in Amazon S3 for the Maven repository.
Why this is correct
Caching dependencies avoids re-downloading them.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse CodeBuild's cache with EC2-based solutions (like custom AMIs) or assume that increasing compute resources solves all performance issues, when the actual bottleneck is network latency for repeated downloads.
Detailed technical explanation
How to think about this question
CodeBuild's cache feature stores the Maven local repository (typically ~/.m2/repository) in an S3 bucket, and subsequent builds restore this cache before running the build. The cache is keyed by the project and can be invalidated by changing the cache key or clearing the S3 bucket. In real-world scenarios, this can reduce build times from minutes to seconds for projects with hundreds of dependencies, especially when combined with incremental builds.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
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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: Configure a cache in Amazon S3 for the Maven repository. — Option D is correct because configuring an Amazon S3 cache for the Maven repository allows CodeBuild to reuse previously downloaded dependencies across builds, eliminating the need to re-download them each time. This significantly reduces build time by leveraging the local cache stored in S3, which is a best practice for dependency-heavy builds like Java applications with Maven.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
3 more ways this is tested on DVA-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company uses AWS CodeBuild to compile and test a Java application. The build process takes a long time because dependencies are downloaded every time. Which TWO actions can reduce build time? (Choose TWO.)
easy- A.Increase the compute type of the build environment to have more CPU and memory.
- B.Change the build runtime to a language that compiles faster.
- C.Configure the build project to run builds in parallel.
- ✓ D.Enable local caching in the CodeBuild project to reuse dependency files between builds.
- ✓ E.Use Amazon S3 to cache dependencies and restore them at the start of each build.
Why D: Options D and E are correct. Both local caching (D) and S3 caching (E) allow CodeBuild to reuse previously downloaded dependencies, reducing build time. Option A (increasing compute type) improves CPU/memory but does not affect dependency download time. Option B (changing runtime language) is unrelated to dependency caching. Option C (parallel builds) runs multiple builds concurrently but does not reduce the time for a single build's dependency download.
Variation 2. A company is using AWS CodeBuild to compile and test a Java application. The build takes 15 minutes, but the company wants to reduce build time by caching dependencies. Which file should the developer modify to enable caching in the build project?
medium- A.CodeBuild console settings
- B.pom.xml
- C.buildspec.json
- ✓ D.buildspec.yml
Why D: Option D is correct because the buildspec.yml file can include a 'cache' section to specify paths to cache, such as the Maven local repository (~/.m2). Option A is incorrect because the CodeBuild console settings are not a file; the question specifically asks which file to modify. Option B is incorrect because pom.xml is a Maven project file used for dependency management, not for CodeBuild caching configuration. Option C is incorrect because buildspec.json is not the standard filename; CodeBuild expects buildspec.yml or buildspec.yaml.
Variation 3. A developer is using AWS CodeBuild to compile and package a Java application. The build process takes longer than expected. The developer wants to speed up the build by reusing dependencies that have not changed between builds. Which feature should the developer enable?
easy- A.Configure the build project to run builds concurrently
- B.Enable build artifacts in the CodeBuild project
- ✓ C.Enable caching for the CodeBuild project by specifying an S3 bucket for cache storage
- D.Store the build's output artifacts in an S3 bucket
Why C: The correct answer is C: Enable caching for the CodeBuild project by specifying an S3 bucket for cache storage. CodeBuild caching allows reusing previously downloaded dependencies, reducing build time. Option A is incorrect because running builds concurrently does not reuse dependencies across builds; it runs separate builds simultaneously. Option B is incorrect because enabling build artifacts does not affect dependency caching; artifacts are outputs. Option D is incorrect because storing artifacts in S3 does not provide caching for dependencies; it only stores the build output.
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Last reviewed: Jul 4, 2026
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