DynamoDB Global Table vs Regular DynamoDB Table

A DynamoDB Global Table is a multi-region, fully replicated version of a standard DynamoDB table, allowing for real-time data synchronization across multiple AWS regions. In contrast, a regular DynamoDB table is region-specific and only exists in a single AWS region.

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2. Key Differences

Feature	Regular DynamoDB Table	DynamoDB Global Table
Replication	No automatic replication	Multi-region replication
Availability	Limited to one region	Available in multiple regions
Latency	Single-region access	Lower latency for global users
Write Conflicts	No conflicts	Uses last writer wins conflict resolution
Use Case	Local applications, single-region workloads	Multi-region applications, disaster recovery

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3. Example Scenario

📌 Scenario: Multi-Region E-Commerce Application

Imagine an e-commerce company with customers in North America and Europe. If the DynamoDB table is in us-east-1 (Virginia) but a customer in eu-west-1 (Ireland) accesses it, they will experience high latency due to cross-region requests.

✅ Solution: DynamoDB Global Table

• A Global Table is created in us-east-1 and eu-west-1.
• Customer data is automatically synchronized between both regions.
• A user in Europe gets fast responses from the DynamoDB instance in eu-west-1 instead of querying us-east-1.

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4. Architecture Diagram

🔹 Regular DynamoDB Table

+-----------------+
|  DynamoDB (us-east-1) |
+-----------------+
       |
       | (High latency for global users)
       v
Customers in EU and Asia experience delay

🔹 DynamoDB Global Table

+-----------------+        +-----------------+
|  DynamoDB (us-east-1)  | <--> |  DynamoDB (eu-west-1)  |
+-----------------+        +-----------------+
       |                          |
       v                          v
Users in US            Users in EU get low latency

• Data is replicated automatically.
• Write conflicts are handled with last-writer-wins.

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5. When to Use DynamoDB Global Tables?

✅ Multi-region applications (e.g., global SaaS products)
✅ Disaster recovery and failover (e.g., ensuring data availability if one region fails)
✅ Low-latency access for worldwide users

Would you like help setting up a Global Table in AWS? 🚀