DynamoDB - Access Patterns and Query Optimization
You are designing a single DynamoDB table to store customers and their orders. Which key design allows efficient retrieval of all orders for a customer and quick access to a specific order?
You are designing a single DynamoDB table to store customers and their orders. Which key design allows efficient retrieval of all orders for a customer and quick access to a specific order?
hard🚀 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Identify query patterns
We need to fetch all orders for a customer and also a specific order quickly.Step 2: Analyze key design
Using PK as 'CUSTOMER#' groups all orders under one partition; SK as 'ORDER# ' uniquely identifies each order. Step 3: Benefits
This design supports querying all orders by customer and retrieving a specific order by SK.Final Answer:
Partition key: CUSTOMER#, Sort key: ORDER# -> Option BQuick Check:
Check if design supports both query patterns efficiently [OK]
Quick Trick: PK groups customer orders; SK uniquely identifies orders [OK]
Common Mistakes:
MISTAKES- Using order ID as PK prevents grouping orders by customer
- Using date as SK alone does not uniquely identify orders
- Reversing PK and SK roles reduces query efficiency
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