AWS - DynamoDB
A DynamoDB table is set to provisioned mode with 8 read capacity units. If your application performs 12 eventually consistent reads per second, what will happen?
A DynamoDB table is set to provisioned mode with 8 read capacity units. If your application performs 12 eventually consistent reads per second, what will happen?
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand capacity units
Provisioned read capacity units limit the number of reads per second.Step 2: Compare usage to capacity
12 reads exceed 8 provisioned units, causing throttling.Step 3: Consider consistency model
Eventually consistent reads consume half a read unit each, so 12 reads consume 6 units, which is under 8.Final Answer:
All requests will succeed without throttling -> Option AQuick Check:
Eventually consistent reads cost half unit [OK]
Quick Trick: Eventually consistent reads cost half a unit [OK]
Common Mistakes:
- Assuming all reads cost one full unit regardless of consistency
- Thinking DynamoDB auto-scales provisioned mode
- Believing table switches modes automatically
Master "DynamoDB" in AWS
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