Cross-region replication (Global Tables) in DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Cross-region replication in DynamoDB Global Tables?

Cross-region replication in DynamoDB Global Tables means automatically copying your table data across multiple AWS regions to keep them in sync. This helps your app stay fast and available worldwide.

intermediate

How does DynamoDB Global Tables handle data conflicts?

DynamoDB Global Tables uses a last-writer-wins approach based on timestamps to resolve conflicts when the same item is updated in different regions at the same time.

beginner

Why use Global Tables instead of a single-region DynamoDB table?

Global Tables improve availability and reduce latency by letting users read and write data in the region closest to them. They also provide automatic replication and disaster recovery.

intermediate

Can you add or remove regions from a DynamoDB Global Table after creation?

Yes, you can add or remove replica regions from a Global Table anytime to adjust to your app’s needs without downtime.

intermediate

What happens if a region goes down in a Global Table setup?

If a region goes down, your app can still read and write data in other regions. When the down region recovers, DynamoDB syncs the data automatically.

What is the main purpose of DynamoDB Global Tables?

A To create indexes on tables

B To backup data to Amazon S3

C To replicate data across multiple AWS regions automatically

D To encrypt data at rest

Global Tables automatically replicate your DynamoDB table data across multiple AWS regions for high availability and low latency.

How does DynamoDB Global Tables resolve write conflicts?

A Last-writer-wins based on timestamps

B First-writer-wins

C Manual conflict resolution by user

D Random selection

DynamoDB Global Tables use last-writer-wins conflict resolution based on timestamps to keep data consistent.

Can you add a new region to an existing Global Table?

A No, you must create a new table

B Only during table creation

C Only if the table is empty

D Yes, anytime without downtime

You can add or remove replica regions from a Global Table anytime without downtime.

What happens if one region in a Global Table fails?

A Other regions continue working and sync later

B Writes are blocked globally

C All data is lost

D The table is deleted

If a region fails, other regions continue to operate and data syncs back when the region recovers.

Which of these is NOT a benefit of using Global Tables?

A Lower latency for global users

B Manual data backup scheduling

C Automatic multi-region replication

D Improved availability

Manual data backup scheduling is not a feature of Global Tables; backups are separate from replication.

Explain how DynamoDB Global Tables keep data consistent across regions.

Think about how updates in different places are merged.

Describe the benefits of using Cross-region replication with DynamoDB Global Tables for a global app.

Consider user experience and data safety worldwide.