Event-driven architecture patterns in DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an event in event-driven architecture?

An event is a significant change or action that happens in a system, like a new order placed or a user signed up. It triggers other parts of the system to react.

intermediate

How does DynamoDB Streams support event-driven architecture?

DynamoDB Streams captures data changes in a table and sends them as events, allowing other services to react to these changes in real time.

beginner

What is the role of an event processor in event-driven systems?

An event processor listens for events and performs actions based on those events, like updating data or triggering workflows.

intermediate

Explain the difference between event-driven and request-driven architectures.

Event-driven architecture reacts to events asynchronously, while request-driven waits for direct requests and responds immediately.

beginner

Why is decoupling important in event-driven architecture?

Decoupling means parts of the system work independently, so changes in one part don’t break others. It makes the system flexible and easier to maintain.

What does DynamoDB Streams capture?

A Network traffic logs

B User login events

C Changes to items in a DynamoDB table

D Scheduled backups

DynamoDB Streams captures changes to items in a DynamoDB table as events.

In event-driven architecture, what triggers an action?

A An event

B A direct user request

C A scheduled timer

D A database backup

Actions are triggered by events, which represent changes or significant occurrences.

Which of these is a benefit of decoupling in event-driven systems?

A Tighter integration

B Easier maintenance

C More complex dependencies

D Slower response times

Decoupling makes systems easier to maintain by reducing dependencies.

What is an event processor responsible for?

A Managing user authentication

B Storing data permanently

C Generating user reports

D Listening and reacting to events

Event processors listen for events and perform actions based on them.

How does event-driven architecture handle communication?

A Asynchronously through events

B Synchronously through direct calls

C Only through user input

D By polling databases continuously

Event-driven architecture uses asynchronous communication via events.

Describe how DynamoDB Streams can be used in an event-driven architecture.

Think about how changes in the database can trigger other actions.

Explain why decoupling is important in event-driven systems and how it benefits system design.

Consider how parts of the system work without tightly depending on each other.