[Solved] You wrote this DynamoDB Scan command but it is very slow:aws dynamodb scan --table-name UsersWhat is the best way to improve performance if you only want users with UserId = '123'? | AWS

AWS - DynamoDB

You wrote this DynamoDB Scan command but it is very slow:

aws dynamodb scan --table-name Users

What is the best way to improve performance if you only want users with UserId = '123'?

AReplace Scan with Query using KeyConditionExpression on UserId

BAdd a FilterExpression to the Scan command

CIncrease the Read Capacity Units of the table

DUse UpdateItem to modify the UserId

Step-by-Step Solution

Solution:

Step 1: Identify problem with Scan
Scan reads all items, causing slowness when filtering after reading.
Step 2: Use Query for known key
Query with KeyConditionExpression on UserId reads only matching items, improving speed.
Final Answer:
Replace Scan with Query using KeyConditionExpression on UserId -> Option A
Quick Check:
Known key = Query, not Scan [OK]

Quick Trick: Use Query with key condition, not Scan with filter [OK]

Common Mistakes:

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