Step Functions with DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is AWS Step Functions?

AWS Step Functions is a service that lets you coordinate multiple AWS services into serverless workflows so you can build and update apps quickly.

beginner

How does AWS Step Functions interact with DynamoDB?

Step Functions can call DynamoDB operations like reading, writing, or updating data as part of a workflow to automate tasks and manage data flow.

intermediate

What is a common use case for Step Functions with DynamoDB?

A common use case is to automate order processing where Step Functions manage the workflow and DynamoDB stores order data and status updates.

beginner

What is a Task state in Step Functions?

A Task state represents a single unit of work in a workflow, such as calling a DynamoDB API to put or get an item.

intermediate

How do you handle errors when Step Functions call DynamoDB?

You can use Catch and Retry fields in Step Functions to handle errors gracefully, retry operations, or move to alternative steps if DynamoDB calls fail.

What does a Task state in Step Functions usually do with DynamoDB?

A Runs SQL queries on DynamoDB

B Creates a new DynamoDB table

C Deletes the entire DynamoDB database

D Calls DynamoDB API to perform operations

Task states perform specific actions like calling DynamoDB APIs to read or write data.

Which AWS service helps you automate workflows that include DynamoDB operations?

A AWS Step Functions

B Amazon S3

C AWS Lambda only

D Amazon EC2

AWS Step Functions coordinate multiple services including DynamoDB to automate workflows.

How can Step Functions handle a failure when a DynamoDB operation fails?

A By deleting the DynamoDB table

B By restarting the entire AWS account

C Using Catch and Retry blocks in the workflow

D By ignoring the error silently

Catch and Retry allow workflows to manage errors and retry or take alternative actions.

What kind of data store is DynamoDB?

A NoSQL key-value and document database

B Relational SQL database

C File storage system

D In-memory cache only

DynamoDB is a NoSQL database designed for key-value and document data.

Which of these is NOT a direct feature of Step Functions?

A Running serverless workflows

B Storing large files

C Coordinating multiple AWS services

D Handling workflow errors

Step Functions do not store files; they coordinate workflows and services.

Explain how AWS Step Functions can be used to automate a process involving DynamoDB.

Think about how a workflow can manage data updates and decisions.

Describe how error handling works in Step Functions when interacting with DynamoDB.

Consider what happens if a DynamoDB call fails during a workflow.