Aurora Serverless v2 is a relational database-as-a-service offering MySQL and PostgreSQL interfaces, with a focus on production workloads. However, it has limitations, such as no support for infrastructure as code (IaC) via AWS CloudFormation, limited scalability to zero, and no Data API. In contrast, Fauna is an API-based, globally distributed, and programmable database that offers a dynamic tenancy model, transactional consistency, and temporal data management. Fauna's architecture has a separate transaction log service, which ensures data consistency while maintaining horizontal scalability and high availability. Aurora Serverless v2 pricing is based on process running time, with costs ranging from $350 to $8.50 per million transactions, depending on multi-region replication and storage costs. The choice between Aurora Serverless v2 and Fauna depends on the specific use case, workload requirements, and desired features.