[Solved] Given a DynamoDB table with 1000 items, what will be the main difference in performance between these two operations?1. Query with KeyConditionExpression on partition key2. Scan without any filter | AWS

AWS - DynamoDB

Given a DynamoDB table with 1000 items, what will be the main difference in performance between these two operations?

1. Query with KeyConditionExpression on partition key
2. Scan without any filter

ABoth read the same number of items and have similar speed

BScan reads fewer items and is faster; Query reads all items and is slower

CBoth read all items but Query is slower due to filtering

DQuery reads fewer items and is faster; Scan reads all items and is slower

Step-by-Step Solution

Solution:

Step 1: Analyze Query operation
Query uses the partition key to directly find matching items, reading fewer items and faster.
Step 2: Analyze Scan operation
Scan reads every item in the table, making it slower and more expensive.
Final Answer:
Query reads fewer items and is faster; Scan reads all items and is slower -> Option D
Quick Check:
Query = fewer reads, Scan = full table [OK]

Quick Trick: Query targets keys, Scan reads whole table [OK]

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