DVA-C02 Development with AWS Services Practice Question
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 developer is building a serverless application that uses Amazon DynamoDB. The application needs to retrieve an item by its primary key frequently. Which DynamoDB API call should the developer use to achieve the lowest latency?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Why wrong: Scan reads every item in the table, which is extremely inefficient for retrieving a single item. It consumes a lot of read capacity and has high latency.
B
Query
Why wrong: Query can retrieve items by partition key, but it returns all items with that key. For a single item, it is less efficient than GetItem because it may perform additional filtering.
C
GetItem
GetItem directly retrieves an item by its primary key. It is the most efficient operation for a single item lookup, providing the lowest latency and consuming the least read capacity.
D
BatchGetItem
Why wrong: BatchGetItem is designed for retrieving multiple items in a single request. For a single item, it adds unnecessary overhead and is no better than GetItem.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
GetItem
The GetItem API call is the most efficient way to retrieve a single item by its primary key in DynamoDB, as it directly accesses the item using the hash key (and optionally the sort key) with consistent, single-digit millisecond latency. Unlike Scan or Query, GetItem does not need to evaluate any conditions or filter through other items, making it the lowest-latency option for this specific use case.
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.
✗
Scan
Why it's wrong here
Scan reads every item in the table, which is extremely inefficient for retrieving a single item. It consumes a lot of read capacity and has high latency.
✗
Query
Why it's wrong here
Query can retrieve items by partition key, but it returns all items with that key. For a single item, it is less efficient than GetItem because it may perform additional filtering.
✓
GetItem
Why this is correct
GetItem directly retrieves an item by its primary key. It is the most efficient operation for a single item lookup, providing the lowest latency and consuming the least read capacity.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
BatchGetItem
Why it's wrong here
BatchGetItem is designed for retrieving multiple items in a single request. For a single item, it adds unnecessary overhead and is no better than GetItem.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Query with GetItem, assuming Query is always faster because it uses a key condition, but Query still requires evaluating the sort key and can return multiple items, whereas GetItem is the only API optimized for a single-item primary key lookup.
Detailed technical explanation
How to think about this question
Under the hood, DynamoDB uses a distributed hash table where each item's primary key is hashed to determine its physical partition. GetItem performs a direct hash lookup to the specific partition and retrieves the item without scanning or filtering, achieving predictable latency. In real-world scenarios, using GetItem for single-item reads is critical for high-traffic APIs where every millisecond counts, such as a user profile lookup in a gaming leaderboard.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: GetItem — The GetItem API call is the most efficient way to retrieve a single item by its primary key in DynamoDB, as it directly accesses the item using the hash key (and optionally the sort key) with consistent, single-digit millisecond latency. Unlike Scan or Query, GetItem does not need to evaluate any conditions or filter through other items, making it the lowest-latency option for this specific use case.
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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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 →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.