Hot partition prevention in DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a hot partition in DynamoDB?

A hot partition is a single partition in DynamoDB that receives a disproportionately high amount of read or write traffic, causing throttling and performance issues.

beginner

Why should hot partitions be avoided in DynamoDB?

Hot partitions cause uneven load distribution, leading to throttling, slower response times, and reduced overall database performance.

intermediate

Name one common strategy to prevent hot partitions in DynamoDB.

Use a partition key design that distributes traffic evenly, such as adding random suffixes or using composite keys to spread requests across many partitions.

intermediate

How does adding a random suffix to a partition key help prevent hot partitions?

Adding a random suffix spreads requests across multiple partitions instead of one, balancing the load and avoiding throttling on a single partition.

beginner

What role does the partition key play in hot partition prevention?

The partition key determines how data is distributed across partitions. A well-designed partition key evenly distributes traffic, preventing hot partitions.

What causes a hot partition in DynamoDB?

A Uneven traffic concentrated on a single partition

B Too many tables in the database

C Using global secondary indexes

D Low read capacity units

A hot partition happens when one partition receives much more traffic than others, causing throttling.

Which design helps prevent hot partitions?

A Using a single static partition key for all items

B Using only sort keys

C Storing all data in one partition

D Adding a random suffix to partition keys

Adding a random suffix spreads requests across multiple partitions, balancing the load.

What happens if a partition becomes hot?

A The database automatically duplicates the partition

B Requests to that partition may be throttled

C All partitions slow down equally

D The partition key changes automatically

Throttling occurs on the hot partition to limit traffic and protect performance.

Which of these is NOT a good way to prevent hot partitions?

A Distribute traffic evenly using partition keys

B Use composite keys to spread load

C Concentrate all writes on one partition

D Add randomness to partition keys

Concentrating writes on one partition causes hot partitions and should be avoided.

What is a partition key's main role in DynamoDB?

A To distribute data and traffic across partitions

B To encrypt data

C To store metadata

D To index data globally

The partition key decides how data and traffic are spread across partitions.

Explain what a hot partition is and why it is a problem in DynamoDB.

Think about how traffic concentration affects database speed.

Describe two strategies to prevent hot partitions in DynamoDB.

Focus on how to spread requests across partitions.