[Solved] You have a DynamoDB table storing orders with partition key 'CustomerId'.... How can you improve partition key distribution to avoid hot partitions? | DynamoDB

DynamoDB - Access Patterns and Query Optimization

You have a DynamoDB table storing orders with partition key 'CustomerId'. Some customers place thousands of orders daily, others only a few. How can you improve partition key distribution to avoid hot partitions?

AUse 'OrderId' alone as partition key

BKeep 'CustomerId' as partition key and add 'OrderId' as sort key

CUse a composite key combining 'CustomerId' and 'OrderDate' as partition key

DUse a random number as partition key for all orders

Step-by-Step Solution

Solution:

Step 1: Identify problem with current partition key
Using only 'CustomerId' causes hot partitions for customers with many orders.
Step 2: Improve distribution by combining keys
Combining 'CustomerId' and 'OrderDate' creates more unique partition keys, spreading load better.
Step 3: Understand why other options fail
Keep 'CustomerId' as partition key and add 'OrderId' as sort key keeps same partition key, so hot partitions remain; Use 'OrderId' alone as partition key loses customer grouping; Use a random number as partition key for all orders breaks data organization.
Final Answer:
Use a composite key combining 'CustomerId' and 'OrderDate' as partition key -> Option C
Quick Check:
Composite key increases uniqueness, reduces hot partitions [OK]

Quick Trick: Combine keys to increase uniqueness and spread load [OK]

Common Mistakes:

MISTAKES

Adding sort key but not changing partition key
Using only order ID loses customer grouping
Random keys break data access patterns

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More DynamoDB Quizzes

How can you improve partition key distribution to avoid hot partitions?

Step 1: Identify problem with current partition key

Step 2: Improve distribution by combining keys

Step 3: Understand why other options fail

Final Answer:

Quick Check:

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