DynamoDB - Cost Optimization and Monitoring
A DynamoDB table in provisioned mode has 5 read capacity units and 5 write capacity units. If your application performs 10 strongly consistent reads and 3 writes per second, what will happen?
A DynamoDB table in provisioned mode has 5 read capacity units and 5 write capacity units. If your application performs 10 strongly consistent reads and 3 writes per second, what will happen?
medium📝 query result Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Calculate capacity usage for reads and writes
Strongly consistent reads consume 2 read units each. 10 reads x 2 = 20 read units needed, but only 5 provisioned.Step 2: Compare writes usage
3 writes per second require 3 write units, which is less than 5 provisioned, so writes succeed.Final Answer:
Reads are throttled, writes succeed -> Option AQuick Check:
Provisioned capacity exceeded for reads only = throttling reads [OK]
Quick Trick: Strongly consistent reads cost double read units [OK]
Common Mistakes:
MISTAKES- Ignoring strongly consistent read cost
- Assuming writes throttle first
- Thinking all requests succeed regardless
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