DynamoDB - Access Patterns and Query Optimization
You need to design a DynamoDB table to store IoT sensor data from thousands of devices sending data every second. Which partition key design best ensures even data distribution?
You need to design a DynamoDB table to store IoT sensor data from thousands of devices sending data every second. Which partition key design best ensures even data distribution?
hard🚀 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze data volume and key uniqueness needs
Thousands of devices sending data every second require many unique keys to avoid hotspots.Step 2: Evaluate partition key options
Composite key with DeviceId and timestamp truncated to minute creates many unique keys spreading load.Step 3: Reject poor options
DeviceId alone clusters data per device; static key causes hotspot; timestamp alone groups by time only.Final Answer:
Use a composite partition key combining DeviceId and a truncated timestamp to the minute. -> Option BQuick Check:
Composite keys with device and time spread load well [OK]
Quick Trick: Combine device ID and time for unique partition keys [OK]
Common Mistakes:
MISTAKES- Using static keys causing hotspots
- Using only timestamp causing clustering
- Ignoring high write volume impact
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