DynamoDB - Cost Optimization and Monitoring
A developer attempts to purchase Reserved Capacity but encounters an error stating the purchase is invalid. What is a probable cause?
A developer attempts to purchase Reserved Capacity but encounters an error stating the purchase is invalid. What is a probable cause?
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Understand capacity modes
DynamoDB tables can be provisioned or on-demand capacity mode.Step 2: Reserved Capacity applicability
Reserved Capacity applies only to provisioned capacity tables, not on-demand.Step 3: Identify error cause
If the table is on-demand, purchasing Reserved Capacity will cause an error.Final Answer:
The table is using on-demand capacity mode -> Option BQuick Check:
Reserved Capacity cannot be purchased for on-demand tables. [OK]
Quick Trick: Reserved Capacity only works with provisioned mode tables [OK]
Common Mistakes:
MISTAKES- Assuming Reserved Capacity works with on-demand tables
- Ignoring service quotas as error cause
- Confusing IAM permissions with purchase errors
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