This DVA-C02 practice question tests your understanding of development with aws services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 Lambda function needs temporary scratch space larger than the default while processing images. Which setting should be adjusted?
Reserved concurrency
Why wrong: This does not meet the stated requirement as directly as the correct option.
Ephemeral storage size for /tmp
Correct for the stated requirement.
Function URL auth type
Why wrong: This does not meet the stated requirement as directly as the correct option.
Dead-letter queue target
Why wrong: This does not meet the stated requirement as directly as the correct option.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Ephemeral storage size for /tmp
Lambda functions have a default /tmp storage of 512 MB, which is insufficient for large image processing tasks. Adjusting the ephemeral storage size (up to 10,240 MB) provides the necessary scratch space for temporary files, such as intermediate image buffers or resized outputs, without requiring external storage like EFS.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Reserved concurrency
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Ephemeral storage size for /tmp
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
Function URL auth type
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Dead-letter queue target
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Common exam traps
The trap here is that candidates confuse ephemeral storage with memory allocation or external storage services, assuming that increasing the function's memory or using S3 will solve the scratch space issue, when the /tmp directory is the only directly configurable scratch space within the Lambda execution environment.
Detailed technical explanation
Ephemeral storage is backed by the same compute instance as the Lambda execution environment, providing low-latency access for temporary data. Under the hood, the /tmp directory is an encrypted file system mounted at invocation time, and its size is configurable in 1 MB increments up to 10,240 MB. In real-world scenarios, processing high-resolution images (e.g., 4K or RAW formats) can easily exceed 512 MB, making this adjustment critical to avoid out-of-disk-space errors.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
The correct answer is: Ephemeral storage size for /tmp — Lambda functions have a default /tmp storage of 512 MB, which is insufficient for large image processing tasks. Adjusting the ephemeral storage size (up to 10,240 MB) provides the necessary scratch space for temporary files, such as intermediate image buffers or resized outputs, without requiring external storage like EFS.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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