AWS - DynamoDB
Why does a Query operation in DynamoDB generally consume fewer read capacity units than a Scan operation for the same table?
Why does a Query operation in DynamoDB generally consume fewer read capacity units than a Scan operation for the same table?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand read capacity unit consumption
Read capacity units depend on the amount of data read, not just returned.Step 2: Compare Query and Scan reading behavior
Query reads only items matching the key condition; Scan reads all items regardless of filters.Final Answer:
Query reads only matching items using keys; Scan reads entire table regardless of filters -> Option BQuick Check:
Read units depend on data read; Query reads less [OK]
Quick Trick: Read units depend on data read, Query reads less [OK]
Common Mistakes:
- Thinking Query caches reduce read units
- Believing Scan uses more CPU affects read units
- Assuming Query compresses data automatically
Master "DynamoDB" in AWS
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