DBS-C01 Amazon DynamoDB global tables Practice Question
A company is deploying an Amazon DynamoDB table with on-demand capacity mode. The table will be accessed from multiple AWS Regions and requires strong consistency. Which THREE steps should be taken to meet these requirements?
⚠ Common exam trap
A common trap is assuming that strongly consistent reads work with global tables across all Regions. In reality, global tables only provide eventual consistency, so strongly consistent reads are not supported in replica Regions. The only way to get strong consistency is to read from the source Region.
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 global secondary index
None of the options correctly meet the requirements. DynamoDB global tables provide multi-Region access but only eventual consistency, and strongly consistent reads are limited to the source Region. A global secondary index does not enable cross-Region access. Therefore, no combination of the listed steps can achieve strong consistency across multiple Regions.
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 global secondary index
Why this is correct
Correct. A global secondary index allows efficient querying across Regions using different keys, which is important for accessing data from multiple Regions.
- ✗
Use DynamoDB Accelerator (DAX)
Why it's wrong here
Wrong. DAX is a caching layer that only supports eventually consistent reads and does not help with multi-Region access or strong consistency.
- ✗
Configure auto scaling
Why it's wrong here
Wrong. Auto scaling is used for provisioned capacity mode, not on-demand capacity mode, and does not address multi-Region or consistency requirements.
- ✓
Enable DynamoDB global tables
Why this is correct
Correct. Global tables replicate data across Regions, enabling multi-Region access, though they only provide eventual consistency.
- ✗
Use strongly consistent reads
Why it's wrong here
Wrong. Strongly consistent reads are not supported by global tables in replica Regions; they are only available in the source table, so this option does not achieve strong consistency across multiple Regions.
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