DynamoDB Streams concept - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is DynamoDB Streams?

DynamoDB Streams is a feature that captures a time-ordered sequence of item-level changes in a DynamoDB table. It lets you track and react to data changes like inserts, updates, and deletes.

beginner

What types of data changes does DynamoDB Streams capture?

It captures inserts (new items), updates (changes to existing items), and deletes (removal of items) in the table.

intermediate

How can DynamoDB Streams be used in real life?

You can use Streams to trigger actions like updating a search index, sending notifications, or replicating data to another system whenever your table changes.

intermediate

What is a shard in DynamoDB Streams?

A shard is a container for stream records. It holds a sequence of data changes and allows applications to read these changes in order.

beginner

How long are records kept in DynamoDB Streams?

Stream records are kept for 24 hours from the time they are generated. After that, they expire and are no longer accessible.

What does DynamoDB Streams capture?

A Item-level changes like inserts, updates, and deletes

B Only table schema changes

C User login events

D Backup snapshots

DynamoDB Streams captures item-level changes such as inserts, updates, and deletes.

How long are DynamoDB Stream records available for reading?

A 7 days

B 30 days

C 24 hours

D Indefinitely

Stream records are kept for 24 hours after creation.

Which of the following is NOT a use case for DynamoDB Streams?

A Storing large binary files

B Real-time data replication

C Triggering a Lambda function on data change

D Updating a search index

DynamoDB Streams is not used for storing files; it tracks data changes.

What is a shard in DynamoDB Streams?

A A backup copy of the table

B A container for a sequence of stream records

C A type of index

D A user permission level

A shard holds a sequence of stream records for reading changes.

Can DynamoDB Streams capture changes to table schema?

A Only for global secondary indexes

B Yes, it captures all schema changes

C Only when enabled explicitly

D No, it only captures item-level data changes

Streams capture only item-level changes, not schema changes.

Explain what DynamoDB Streams is and why it is useful.

Think about how you might want to react when your data changes.

Describe the lifecycle of a record in DynamoDB Streams.

Consider how long you can access the change after it happens.