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Google Cloud Spanner vs. Amazon DynamoDB Comparison

When it comes to cloud computing, businesses have many choices when selecting a database solution that aligns with their needs. Two prominent players in managed databases are Google Cloud Spanner and Amazon DynamoDB. This article aims to comprehensively compare these two services, shedding light on their features, performance, scalability, and suitability for different use cases.

Overview of Google Cloud Spanner

Google Cloud Spanner is a globally distributed, horizontally scalable, and strongly consistent relational database service. It is designed to seamlessly combine the benefits of traditional relational databases with the scalability and global distribution capabilities of NoSQL databases. One of the key features that set Spanner apart is its ability to provide strong consistency across the globe, offering high availability and low-latency access to data.

Overview of Amazon DynamoDB

Amazon DynamoDB, on the other hand, is a fully managed NoSQL database service provided by Amazon Web Services (AWS). It is designed for applications that require low latency and seamless scalability. DynamoDB is known for its simplicity, flexibility, and automatic scaling, making it a popular choice for developers building web, mobile, gaming, and IoT applications.

Now, let’s delve into a detailed comparison of these two services across various dimensions:


Google Cloud Spanner: Spanner is designed for horizontal scalability, allowing businesses to scale their database horizontally across multiple regions. It offers automatic sharding and distribution of data, making it a suitable choice for applications with global reach. Spanner’s underlying architecture is built to handle massive amounts of data and transactions while maintaining low-latency access.

Amazon DynamoDB: DynamoDB is renowned for its seamless scalability. It automatically scales both read and write capacity based on the demand, and developers are not required to provision hardware or worry about infrastructure management. DynamoDB is suitable for applications with variable workloads, providing the flexibility to handle traffic bursts without manual intervention.

Consistency Model

Google Cloud Spanner: One of the distinguishing features of Spanner is its strong consistency model. It ensures that all data replicas are consistent, regardless of the geographical distribution. This makes it suitable for applications where data consistency is critical, such as financial transactions and e-commerce.

Amazon DynamoDB: DynamoDB, being a NoSQL database, provides eventual consistency by default. However, developers can choose strong consistency for read operations in scenarios where immediate and consistent access to the latest data is essential.

Global Distribution

Google Cloud Spanner: Spanner is built for global distribution from the ground up. It allows users to deploy databases across multiple regions without sacrificing consistency or performance. This makes it an excellent choice for applications needing low-latency data access worldwide.

Amazon DynamoDB: DynamoDB supports global tables, allowing users to replicate their data across multiple AWS regions. However, the global distribution capabilities of DynamoDB are often considered not as seamless as Google Cloud Spanner, especially in achieving low-latency access with solid consistency.

Query Language and Schema

Google Cloud Spanner: Spanner supports SQL as its query language, making it familiar and easy for developers accustomed to traditional relational databases. It also offers schema flexibility, allowing users to add or modify columns without downtime.

Amazon DynamoDB: DynamoDB uses a NoSQL data model and supports JSON-like documents. Queries are performed using the AWS SDK or API, and it does not use traditional SQL queries. DynamoDB’s schema-less design provides flexibility but may require a different mindset and approach for developers accustomed to relational databases.


Google Cloud Spanner: Spanner is optimized for high-performance global transactions. It uses a combination of synchronous and asynchronous replication to ensure low-latency access to data. The underlying architecture is designed to handle large datasets and high transaction volumes efficiently.

Amazon DynamoDB: DynamoDB offers low-latency performance, especially for read and write-intensive workloads. The service automatically scales resources to meet the demand, providing consistent performance even under varying workloads.

Use Cases

Google Cloud Spanner: Spanner is well-suited for applications that require strong consistency, global distribution, and support for complex queries. It finds applications in finance, e-commerce, and gaming where low-latency access to consistent data is crucial.

Amazon DynamoDB: DynamoDB is versatile and fits well with applications that require seamless scalability, flexible data models, and low-latency access. It is commonly used in web and mobile applications and scenarios involving real-time analytics and IoT.

Cost Considerations

Google Cloud Spanner: Pricing for Spanner is based on a combination of storage, computing, and network usage. While it provides strong consistency and global distribution, users should carefully evaluate their specific needs to optimize costs, especially in scenarios with high data transfer across regions.

Amazon DynamoDB: DynamoDB pricing is based on provisioned throughput and consumed storage. Users pay for the capacity they provide, and costs can be influenced by factors such as read and write capacity units and additional features like global tables. Understanding the workload pattern is crucial for cost-effective usage.

GCS vs Amazon DynamoDB: A Comparative Showdown

Both Google Cloud Spanner and Amazon DynamoDB are robust managed database services, each with its strengths and use cases. The choice between the two depends on the application’s specific requirements, including factors such as data consistency, global distribution, query complexity, and cost considerations. Google Cloud Spanner provides strong consistency and international distribution with SQL support, making it suitable for applications with stringent requirements. 

On the other hand, Amazon DynamoDB offers seamless scalability, low-latency performance, and flexibility in data models, catering to a wide range of use cases in the AWS ecosystem. Ultimately, businesses should evaluate their needs carefully and consider factors such as data architecture, development preferences, and anticipated workloads before deciding between these leading database services.

To get the best guidance on cloud computing, including migration strategies, contact us at Inferenz today!