The correct answer is to use a composite primary key (partition key and sort key) to organize data, paired with Global Secondary Indexes (GSIs) to support diverse query patterns. This design is essential for high-traffic DynamoDB e-commerce table design because a composite key allows you to model hierarchical relationships—such as storing all items for a given order under a single partition—while GSIs let you efficiently query by customer ID, order status, or date without scanning the entire table. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your understanding of access pattern-driven design, a core principle of DynamoDB modeling. A common trap is assuming a simple primary key suffices for all queries, which leads to expensive scans under load. Remember the memory tip: “One base table, many GSIs—each query gets its own key.”
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 TWO are best practices for designing a DynamoDB table for high-traffic e-commerce application? (Select TWO.)
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
✓
Create Global Secondary Indexes to support different access patterns.
Option A is correct because Global Secondary Indexes (GSIs) allow you to support multiple query patterns without duplicating data or redesigning the base table. In a high-traffic e-commerce application, you might need to query orders by customer ID, by status, or by date; GSIs provide alternative access patterns with their own partition and sort keys, enabling efficient queries without full table scans.
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.
✓
Create Global Secondary Indexes to support different access patterns.
Why this is correct
GSIs allow querying on non-key attributes.
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 constantly increasing value (e.g., timestamp) as the partition key.
Why it's wrong here
Constantly increasing partition key causes hot partitions.
✗
Design the table to use scan operations for most queries.
Why it's wrong here
Scans are expensive and slow; use queries.
✓
Use a composite primary key (partition key and sort key) to organize data.
Why this is correct
Composite key enables efficient querying and sorting.
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 attribute as the partition key with low cardinality.
Why it's wrong here
Low cardinality leads to hot partitions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think a monotonically increasing partition key (like a timestamp) is acceptable for time-series data, but in DynamoDB it creates a hot partition, whereas in other databases it might be fine; Cisco tests your understanding of DynamoDB's partitioning model and the importance of high-cardinality, evenly distributed partition keys.
Detailed technical explanation
How to think about this question
Under the hood, DynamoDB distributes data across partitions based on the partition key's hash value. A timestamp as partition key causes all writes to land on the same partition until it fills, then a new partition is created, but the write load remains concentrated. GSIs are eventually consistent by default but can be made strongly consistent at extra cost; they also consume write capacity units for each index update, so you must provision accordingly. In a real-world e-commerce scenario, using a composite primary key like CustomerID (partition key) + OrderDate (sort key) allows efficient range queries for a customer's orders, while a GSI on OrderStatus enables queries for pending shipments.
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.
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: Create Global Secondary Indexes to support different access patterns. — Option A is correct because Global Secondary Indexes (GSIs) allow you to support multiple query patterns without duplicating data or redesigning the base table. In a high-traffic e-commerce application, you might need to query orders by customer ID, by status, or by date; GSIs provide alternative access patterns with their own partition and sort keys, enabling efficient queries without full table scans.
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.
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Question Discussion
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