DynamoDB - Access Patterns and Query Optimization
How should you define the primary key in DynamoDB to efficiently query items by
UserId and then sort them by Timestamp?How should you define the primary key in DynamoDB to efficiently query items by UserId and then sort them by Timestamp?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify Query Pattern
You want to query by UserId and sort by Timestamp.Step 2: Define Keys
PartitionKey should be UserId to group user data; SortKey should be Timestamp to order items.Final Answer:
PartitionKey: UserId, SortKey: Timestamp -> Option CQuick Check:
PartitionKey groups, SortKey sorts [OK]
Quick Trick: PartitionKey groups, SortKey sorts data [OK]
Common Mistakes:
MISTAKES- Reversing PartitionKey and SortKey roles
- Using only PartitionKey without SortKey for sorted queries
- Choosing unrelated attributes as keys
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