AWS - DynamoDB
A developer uses Scan with a FilterExpression but notices high latency. What is the best way to improve performance?
A developer uses Scan with a FilterExpression but notices high latency. What is the best way to improve performance?
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Identify cause of high latency
Scan reads entire table, causing high latency especially with filters applied after reading.Step 2: Improve by using Query
Query uses keys to directly access items, reducing read volume and latency.Final Answer:
Replace Scan with Query using KeyConditionExpression -> Option BQuick Check:
Query reduces latency by targeted reads [OK]
Quick Trick: Use Query for better performance over Scan [OK]
Common Mistakes:
MISTAKES- Adding more filters to Scan
- Assuming increasing capacity fixes Scan inefficiency
- Using Scan without filters to improve speed
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