Amazon DynamoDB Global Tables for Cross-Region E-Commerce
A company is designing a database for a global e-commerce platform that requires low-latency reads and writes across multiple AWS Regions. The database must support strongly consistent reads and provide automatic failover. Which AWS service should the company use?
Quick Answer
The answer is Amazon DynamoDB global tables, which are the correct choice for this global e-commerce design because they provide a fully managed, multi-Region, multi-active database that delivers low-latency reads and writes across AWS Regions while supporting strongly consistent reads when using the same-Region endpoint. This architecture achieves automatic failover by allowing any Region to independently handle writes, ensuring high availability without manual intervention. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of when to choose DynamoDB global tables over Aurora Global Database or ElastiCache for Global Datastore—a common trap is assuming Aurora Global Database supports strong consistency across Regions, but it only offers eventual consistency for cross-Region reads. Remember that DynamoDB global tables trade cross-Region strong consistency for active-active availability, so the key memory tip is: "Same-Region strong, cross-Region eventually consistent, but always active."
⚠ Common exam trap
It's easy for candidates to confuse Amazon Aurora Global Database (which is active-passive) with a multi-active solution, assuming it supports automatic failover for writes across Regions, but DynamoDB global tables are the only option that provides true multi-Region write capability with automatic failover.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon DynamoDB global tables
Amazon DynamoDB global tables provide a fully managed, multi-Region, multi-active database solution that delivers low-latency reads and writes across AWS Regions. It supports strongly consistent reads when using the same-Region endpoint and offers automatic failover by allowing any Region to handle writes independently, ensuring high availability without manual intervention.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon ElastiCache for Redis global datastore
Why it's wrong here
ElastiCache is a caching layer, not suitable as a primary database with strong consistency.
- ✗
Amazon S3 with cross-region replication
Why it's wrong here
S3 is object storage and does not support transactional queries or strong consistency automatically.
- ✗
Amazon Aurora Global Database
Why it's wrong here
Aurora Global Database has a primary Region for writes and secondary Regions for reads only; writes are not multi-master.
- ✓
Amazon DynamoDB global tables
Why this is correct
DynamoDB global tables provide multi-Region, multi-master replication with strong consistency and automatic failover.
Go deeper
Related to this question
About these practice questions
Courseiva writes every DBS-C01 question from scratch — 1,663 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
Same concept, more angles
5 more ways this is tested on DBS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is designing a database for a global e-commerce platform that requires sub-millisecond read latencies from multiple AWS regions. The data is mostly read, with occasional writes. Which database solution meets these requirements?
medium- A.Amazon ElastiCache for Redis with global datastore.
- ✓ B.Amazon DynamoDB with Global Tables.
- C.Amazon Aurora MySQL with Aurora Global Database.
- D.Amazon RDS for MySQL with Multi-AZ and read replicas.
Why B: Amazon DynamoDB with Global Tables is the correct choice because it provides a fully managed, multi-Region, multi-master database that replicates data across AWS Regions with sub-second latency, enabling sub-millisecond read latencies for a globally distributed, mostly-read workload. The occasional writes are handled efficiently by the multi-master design, which automatically resolves conflicts using last-writer-wins semantics, ensuring strong eventual consistency.
Variation 2. A company is designing a database for a global e-commerce platform that requires low-latency reads and writes from multiple AWS regions. The data must be strongly consistent within a region but can be eventually consistent across regions. Which TWO services should the company consider?
medium- ✓ A.Amazon DynamoDB Global Tables
- B.Amazon ElastiCache for Redis Global Datastore
- C.Amazon RDS Cross-Region Read Replicas
- D.Amazon Redshift
- ✓ E.Amazon Aurora Global Database
Why A: Amazon DynamoDB Global Tables is correct because it provides a fully managed, multi-region, multi-active database solution that delivers low-latency reads and writes to globally distributed applications. It uses DynamoDB Streams to replicate data across regions with eventual consistency, meeting the requirement for strong consistency within a region and eventual consistency across regions.
Variation 3. A company is designing a database for a global e-commerce platform that requires low-latency reads and writes from multiple AWS Regions. The database must support ACID transactions and complex queries with joins. Which TWO services should they consider? (Choose two.)
medium- A.Amazon DynamoDB with Global Tables
- B.Amazon ElastiCache for Redis with global datastore
- ✓ C.Amazon RDS for MySQL with cross-Region read replicas
- ✓ D.Amazon Aurora with Aurora Global Database
- E.Amazon Redshift with cross-Region snapshots
Why C: Both Amazon Aurora with Aurora Global Database and Amazon RDS for MySQL with cross-Region read replicas support ACID transactions and complex queries with joins. They can provide low-latency reads from multiple regions through read replicas in each region, though writes are directed to a single primary region, which may impact write latency from non-primary regions. Amazon DynamoDB Global Tables provide multi-region writes but do not support joins for complex queries, so they cannot fully meet the requirements. ElastiCache Redis and Amazon Redshift lack the necessary ACID and join capabilities.
Variation 4. A company is designing a database for a global e-commerce platform with strong consistency requirements. The database must support cross-region disaster recovery with RPO < 1 second and RTO < 1 minute. Which TWO AWS database services meet these requirements?
medium- ✓ A.Amazon Aurora Global Database
- B.Amazon RDS Multi-AZ
- C.Amazon Redshift with cross-region snapshot copy
- D.Amazon ElastiCache for Redis with Global Datastore
- ✓ E.Amazon DynamoDB Global Tables
Why A: Amazon Aurora Global Database uses storage-based replication with a typical latency of under 1 second, supporting cross-region disaster recovery with an RPO of less than 1 second and an RTO of less than 1 minute by promoting a secondary region to primary. Amazon DynamoDB Global Tables provide multi-region, fully replicated tables with strong consistency and automatic failover, achieving RPO of less than 1 second and RTO of less than 1 minute through active-active replication.
Variation 5. A startup is building a real-time leaderboard for a mobile game using Amazon DynamoDB. The leaderboard must update frequently and support global access with low latency. Which database design approach is most suitable?
easy- ✓ A.Use Amazon DynamoDB global tables with appropriate partition key design.
- B.Use Amazon ElastiCache for Redis with replication across Regions.
- C.Use Amazon Aurora Global Database with a single writer and multiple readers.
- D.Use Amazon S3 with event notifications to update a leaderboard file.
Why A: Amazon DynamoDB global tables provide multi-Region, fully managed, multi-master replication, which is ideal for a real-time leaderboard requiring frequent updates and low-latency global access. By designing an appropriate partition key (e.g., game ID or time-based composite key), you can distribute write traffic evenly and avoid hot partitions, ensuring consistent performance under high update frequency.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.