AWS Certified Data Analytics Specialty 2021 - Hands-On! - Amazon DynamoDB APIs

The video tutorial covers various operations in DynamoDB, including writing, updating, and deleting data using different APIs like Put Item, Update Item, and Delete Item. It explains batch operations for efficiency and how to read data using Get Item. The tutorial also delves into querying data with partition and sort keys and scanning the entire table. Key concepts include conditional writes, batch processing, and the differences between consistent and eventually consistent reads.

What is the primary function of the PutItem API in DynamoDB?

• To update data partially

• To delete data from the table

• To read data from the table

• To write or replace data in the table

Which API would you use to delete an entire table in DynamoDB?

• DeleteItem

• DeleteTable

• BatchWriteItem

• UpdateItem

What is the advantage of using BatchWriteItem in DynamoDB?

• It reduces latency by performing multiple writes or deletes in one call

• It provides strongly consistent reads

• It allows reading multiple items at once

• It allows querying with complex conditions

Which API is used to read data based on the primary key in DynamoDB?

• Scan

• Query

• GetItem

• BatchWriteItem

What is a key difference between a query and a scan in DynamoDB?

• A scan is faster than a query

• A query returns all attributes by default, while a scan does not

• A query is more efficient as it uses indexes, while a scan reads the entire table

• A query can be done on any attribute, while a scan requires a primary key

What is the purpose of a filter expression in a DynamoDB query?

• To perform a strongly consistent read

• To filter results client-side after the query

• To delete items based on conditions

• To sort the results

How can you improve the performance of a scan operation in DynamoDB?

• By using a filter expression

• By using a projection expression

• By using parallel scans

• By increasing the RCU