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DynamoDB

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description DynamoDB Overview

DynamoDB is a cloud-based, NoSQL database service from Amazon Web Services (AWS). It’s notable for its exceptional scalability and performance, providing rapid data access suitable for demanding applications. DynamoDB is primarily used by developers building mobile apps, online gaming platforms, and any system needing high throughput and low latency operations.

help DynamoDB FAQ

When should I use a partition key and sort key in DynamoDB?

A partition key alone works when every item has a unique lookup key. Adding a sort key lets related records share a partition key and supports ordered range queries, such as retrieving all orders for one customer by date.

Does DynamoDB support strongly consistent reads?

Base tables and local secondary indexes can serve strongly consistent reads within a Region when requested. Global secondary indexes use eventual consistency, and multi-Region behavior depends on the selected global-table consistency mode.

What is the difference between on-demand and provisioned DynamoDB capacity?

On-demand mode automatically scales and charges for consumed read and write requests without capacity planning. Provisioned mode lets teams set throughput and use auto scaling, which can be economical for predictable workloads but can throttle requests when capacity is insufficient.

Can DynamoDB replace a relational database such as PostgreSQL?

DynamoDB excels at high-scale key-value and document access patterns, but it does not provide PostgreSQL-style joins or unrestricted ad hoc SQL queries. Its schema should be designed around known access patterns, often using secondary indexes or deliberate single-table modeling.

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