Stream vs polling comparison in DynamoDB - Quick Revision & Key Differences

Recall & Review

beginner

What is DynamoDB Streams?

DynamoDB Streams is a feature that captures table activity in real-time and provides a time-ordered sequence of item-level changes.

beginner

How does polling work in DynamoDB?

Polling means repeatedly checking the table or a data source at intervals to see if there are any changes or new data.

intermediate

What is a key advantage of using DynamoDB Streams over polling?

Streams provide near real-time updates without the need to repeatedly check the database, saving resources and reducing latency.

intermediate

What is a disadvantage of polling compared to streams?

Polling can cause unnecessary load and delays because it checks for changes even when there are none, leading to wasted resources.

intermediate

When might polling be preferred over streams in DynamoDB?

Polling might be preferred if you want simple implementation without managing stream consumers or if near real-time updates are not critical.

What does DynamoDB Streams provide?

A A real-time sequence of data changes

B A way to backup data

C A method to delete data automatically

D A tool to create tables

DynamoDB Streams captures and provides a real-time sequence of item-level changes.

Which method repeatedly checks for data changes at intervals?

A Polling

B Caching

C Indexing

D Streaming

Polling means checking the data source repeatedly at set intervals.

What is a main benefit of using streams over polling?

A Works without internet

B Simpler to implement

C Lower latency and resource use

D Automatically deletes old data

Streams provide near real-time updates and reduce unnecessary resource use.

What is a downside of polling?

A It does not support updates

B It requires complex setup

C It only works with small tables

D It can cause unnecessary load

Polling can waste resources by checking for changes even when none exist.

When might polling be a better choice?

A When you need real-time updates

B When you want to avoid managing streams

C When you want to reduce load

D When you want automatic backups

Polling is simpler and may be preferred if managing streams is not desired.

Explain the difference between DynamoDB Streams and polling.

Think about how data changes are detected and how often.

Describe scenarios where you would choose polling over streams in DynamoDB.

Consider ease of setup and update speed needs.