Question 582 of 1,711
DEA-C01 Data Store Management Practice Question
Network Topology
A data engineer runs this CLI command. Which query is MOST efficient against this table?
⚠ Common exam trap
A common mix-up: candidates default to scanning or creating a local secondary index without recognizing that a GSI already exists and is purpose-built for the query pattern, leading to inefficient or invalid solutions.
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
✓
Query the CustomerIndex GSI by CustomerID and OrderDate.
The CLI command likely created a global secondary index (GSI) named CustomerIndex on CustomerID and OrderDate. Querying this GSI directly is the most efficient because it uses the index's sort key to retrieve only the relevant items without scanning the entire table, minimizing read capacity consumption.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Query the CustomerIndex GSI by CustomerID and OrderDate.
Why this is correct
The GSI is designed for this query pattern.
- ✗
Scan the table to find all orders for a CustomerID.
Why it's wrong here
Scan is inefficient compared to using GSI.
- ✗
Create a local secondary index on CustomerID.
Why it's wrong here
LSI is not shown; GSI exists.
- ✗
Query by OrderID and filter by OrderDate.
Why it's wrong here
This is efficient but not the most for CustomerID queries.
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Last reviewed: Jun 24, 2026
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