DynamoDB - Cost Optimization and Monitoring
A developer estimates write capacity units (WCUs) for 1 KB items but forgets to account for item size correctly. The code calculates 1 WCU per write regardless of size. What is the likely issue?
A developer estimates write capacity units (WCUs) for 1 KB items but forgets to account for item size correctly. The code calculates 1 WCU per write regardless of size. What is the likely issue?
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Understand WCU calculation for item size
One WCU allows writing 1 KB per second. Larger items require more WCUs, rounded up.Step 2: Identify problem with fixed 1 WCU per write
If item size > 1 KB, fixed 1 WCU underestimates needed capacity, causing throttling or errors.Final Answer:
Underestimating WCUs for items larger than 1 KB -> Option CQuick Check:
WCU depends on item size, fixed 1 WCU is wrong [OK]
Quick Trick: Always multiply WCU by item size in KB rounded up [OK]
Common Mistakes:
MISTAKES- Assuming 1 WCU fits all item sizes
- Confusing read and write capacity units
- Ignoring item size when estimating capacity
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