The answer is to use DynamoDB Streams to update a materialized leaderboard table, a Global Secondary Index with score as the sort key, and a sharding strategy to avoid hot partitions. This trio of best practices directly addresses the core challenge of a DynamoDB gaming leaderboard design: handling frequent score updates while supporting low-latency queries for top players. The GSI with score as the sort key enables efficient range queries using ScanIndexForward=false, allowing you to fetch the highest scores without a full table scan, while DynamoDB Streams lets you asynchronously maintain a pre-computed, read-optimized leaderboard table. Sharding, often by inserting a random suffix into the partition key, distributes write traffic across partitions to prevent throttling. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of DynamoDB’s write sharding patterns and stream-based materialization—a common trap is relying solely on a GSI for both writes and reads, which still risks hot keys. Memory tip: “Stream, Shard, Sort” — the three S’s for a scalable leaderboard.
DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. 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.
Which THREE of the following are best practices for designing a DynamoDB table for a gaming leaderboard that updates scores frequently and supports queries for top players? (Choose 3.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a Global Secondary Index with score as the sort key to query top scores efficiently
Option C is correct because a Global Secondary Index (GSI) with score as the sort key allows efficient range queries (e.g., Query with ScanIndexForward=false) to retrieve top players without scanning the entire table. This leverages DynamoDB's key-value and sorted-index capabilities to minimize read throughput and latency, which is critical for frequently updated leaderboards.
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 the entire table and sort to get top scores
Why it's wrong here
Scanning is inefficient and costly.
✗
Use strongly consistent reads for the leaderboard queries
Why it's wrong here
Strongly consistent reads consume more capacity and may not be necessary.
✓
Use a Global Secondary Index with score as the sort key to query top scores efficiently
Why this is correct
Allows efficient range queries on scores.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use DynamoDB Streams to update a materialized leaderboard table
Why this is correct
Streams can be used to maintain an aggregate table.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a single partition key for all players to easily query top scores
Why it's wrong here
Creates a hot partition, leading to throttling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse strongly consistent reads with eventual consistency for leaderboard use cases, or assume a single partition key is acceptable for global ranking, not realizing it creates a hot partition and prevents efficient sorted queries.
Detailed technical explanation
How to think about this question
DynamoDB partitions data based on the partition key's hash; a GSI with score as the sort key distributes write load across partitions while enabling efficient sorted queries via the Query API. DynamoDB Streams can capture score changes and update a separate materialized table (e.g., a pre-computed leaderboard) asynchronously, reducing read pressure on the main table and allowing complex aggregations without impacting write performance.
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.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a Global Secondary Index with score as the sort key to query top scores efficiently — Option C is correct because a Global Secondary Index (GSI) with score as the sort key allows efficient range queries (e.g., Query with ScanIndexForward=false) to retrieve top players without scanning the entire table. This leverages DynamoDB's key-value and sorted-index capabilities to minimize read throughput and latency, which is critical for frequently updated leaderboards.
What should I do if I get this DBS-C01 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 DBS-C01 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 DBS-C01 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.