Reserved capacity in DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Reserved Capacity in DynamoDB?

Reserved Capacity is a way to pre-pay for a set amount of read and write capacity units in DynamoDB, which can save money compared to on-demand pricing.

beginner

How does Reserved Capacity help with cost management?

By committing to a fixed amount of capacity for a 1 or 3 year term, you get a discount on the hourly rate compared to on-demand usage, helping to reduce costs if your usage is steady.

intermediate

Can Reserved Capacity be shared across multiple DynamoDB tables?

Yes, Reserved Capacity is applied at the AWS account level within a region, so multiple tables can share the reserved capacity you purchase.

intermediate

What happens if your application exceeds the Reserved Capacity limits?

If your usage goes beyond the reserved capacity, DynamoDB will charge you at the on-demand rate for the extra capacity used.

beginner

What are the term options available for Reserved Capacity in DynamoDB?

You can choose Reserved Capacity terms of either 1 year or 3 years, with longer terms offering bigger discounts.

What does Reserved Capacity in DynamoDB primarily help you with?

A Automatically scaling your database

B Saving money by pre-paying for capacity

C Backing up your data

D Encrypting your data

Reserved Capacity lets you pre-pay for read/write units, saving money compared to on-demand pricing.

Can Reserved Capacity be used across multiple tables in the same AWS region?

A Only if tables have the same name

B No, it applies only to one table

C Yes, it is shared across tables in the same region

D Only for tables in different regions

Reserved Capacity is shared at the account level within a region, so multiple tables can use it.

If your usage exceeds your Reserved Capacity, what happens?

A You pay on-demand rates for the extra usage

B You get a refund

C Your database stops working

D AWS automatically increases your reserved capacity

Extra usage beyond reserved capacity is billed at on-demand rates.

What are the available term lengths for Reserved Capacity in DynamoDB?

A 1 year and 3 years

B 6 months and 1 year

C 3 months and 6 months

D No fixed terms

Reserved Capacity can be purchased for 1 or 3 year terms.

Which of the following is NOT a benefit of Reserved Capacity?

A Lower hourly cost for capacity

B Capacity sharing across tables

C Predictable billing

D Automatic scaling of capacity

Reserved Capacity does not automatically scale capacity; it is a fixed pre-purchased amount.

Explain what Reserved Capacity is in DynamoDB and how it can help reduce costs.

Think about paying upfront for a service to get a better price.

Describe how Reserved Capacity is applied across DynamoDB tables and what happens if usage exceeds the reserved amount.

Consider how a shared resource works and what happens when you use more than you reserved.