Question 322 of 1,711
DEA-C01 Data Store Management Practice Question
A data engineer is migrating an on-premises Apache HBase workload to Amazon DynamoDB. The application requires strongly consistent reads and the ability to query by a composite key (partition key + sort key). Which DynamoDB table design should be used?
⚠ Common exam trap
A common mix-up: candidates assume secondary indexes (LSI or GSI) can provide strongly consistent reads, but DynamoDB explicitly restricts strong consistency to base table operations only.
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
✓
Create a table with a partition key and sort key, and use ConsistentRead parameter.
DynamoDB natively supports strongly consistent reads when you use the `ConsistentRead` parameter set to `true` on GetItem, Query, or Scan operations. By defining a table with a partition key and sort key, you can directly query by the composite key (partition key + sort key) with strong consistency, meeting both requirements without additional infrastructure.
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 a table with a partition key and sort key, and use ConsistentRead parameter.
Why this is correct
Table key provides composite key querying; ConsistentRead ensures strong consistency.
- ✗
Use a secondary index with strongly consistent reads.
Why it's wrong here
Secondary indexes are not used for primary key definition.
- ✗
Use a local secondary index (LSI) with the composite key.
Why it's wrong here
LSI is an alternative sort key, but the table still needs a primary key.
- ✗
Create a global secondary index (GSI) with the composite key.
Why it's wrong here
GSI queries are eventually consistent by default.
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Last reviewed: Jun 24, 2026
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