AWS - DynamoDB
You perform a Scan operation with a FilterExpression that matches 50 items out of 5,000. How many items does DynamoDB read internally?
You perform a Scan operation with a FilterExpression that matches 50 items out of 5,000. How many items does DynamoDB read internally?
medium📝 service behavior Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Scan with FilterExpression
Scan reads every item in the table regardless of filter; FilterExpression only filters results after reading.Step 2: Calculate items read
All 5,000 items are read internally, but only 50 are returned after filtering.Final Answer:
5,000 items -> Option DQuick Check:
Scan reads all items despite filter [OK]
Quick Trick: FilterExpression filters results, not read count [OK]
Common Mistakes:
MISTAKES- Thinking FilterExpression reduces read count
- Assuming only matched items are read
- Confusing Scan with Query behavior
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