AWS - DynamoDB
Which operation is generally more efficient when you want to retrieve a small number of items by their partition key?
Which operation is generally more efficient when you want to retrieve a small number of items by their partition key?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify operation for partition key retrieval
Query is designed to efficiently retrieve items using the partition key.Step 2: Compare efficiency
Scan reads all items, which is inefficient for small targeted retrievals.Final Answer:
Query -> Option AQuick Check:
Efficient retrieval by key = Query [OK]
Quick Trick: Use Query for partition key lookups [OK]
Common Mistakes:
MISTAKES- Choosing Scan for key-based retrieval
- Assuming Scan is faster for small data
- Thinking both perform the same
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