DynamoDB - Cost Optimization and Monitoring
You have a DynamoDB table with 5 KB items. You perform 50 eventually consistent reads per second. How many read capacity units (RCUs) do you need?
You have a DynamoDB table with 5 KB items. You perform 50 eventually consistent reads per second. How many read capacity units (RCUs) do you need?
medium📝 query result Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Calculate RCUs per read for 5 KB item
Each eventually consistent read consumes ceil(item_size / 4 KB) * 0.5 RCU. For 5 KB, ceil(5/4)=2 * 0.5 = 1 RCU per read.Step 2: Calculate total RCUs for 50 reads
50 reads * 1 RCU = 50 RCUs.Final Answer:
50 RCUs -> Option DQuick Check:
RCUs needed = 50 [OK]
Quick Trick: Round item size up to 4 KB blocks for RCUs [OK]
Common Mistakes:
MISTAKES- Not rounding item size up correctly
- Using strongly consistent read cost
- Multiplying incorrectly
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