dynamoDB Calculations

Question 1

What is a Read Capacity Unit (RCU) in DynamoDB?

Answer 1

A Read Capacity Unit (RCU) represents the capacity to perform one strongly consistent read request per second for an item up to 4KB in size, or two eventually consistent read requests per second.

Question 2

How is the RCU calculated for transactional reads?

Answer 2

For transactional reads, 2 RCUs are consumed for one transactional read request for an item up to 4KB in size.

Question 3

How is the RCU calculated for items larger than 4KB?

Answer 3

For items larger than 4KB, the RCU is calculated by dividing the total item size by 4KB and rounding up to the nearest whole number.

Question 4

What is a Write Capacity Unit (WCU) in DynamoDB?

Answer 4

A Write Capacity Unit (WCU) represents the capacity to perform one standard write request per second for an item up to 1KB in size.

Question 5

How is the WCU calculated for transactional writes?

Answer 5

For transactional writes, 2 WCUs are consumed for one transactional write request for an item up to 1KB in size.

Question 6

How is the WCU calculated for items larger than 1KB?

Answer 6

For items larger than 1KB, the WCU is calculated by dividing the total item size by 1KB and rounding up to the nearest whole number.