Amazon RDS vs DynamoDB

Feature	Amazon RDS	DynamoDB
Type of database	Managed relational (SQL)	NoSQL
Features	Multiple DB engines	Single-digit millisecond performance
Storage Size	Varies by engine	Virtually any size
Number of tables	Depends on engine	256
Performance	Depends on storage type	Single-digit millisecond read/write performance
Availability & Durability	Multi-AZ, automatic host replacement	Multi-AZ, automatic scale capacity
Backups	Point-in-time recovery	Continuous backups, on-demand backups and restore
Scalability	Auto-scaling, read replicas	Horizontal scaling, instant accommodation of workloads
Security	Virtual network, firewall, SSL	Encryption at rest using KMS
Encryption	Encryption using KMS	Encryption at rest using KMS
Maintenance	Automatic software patching, backups, host replacement	Automatic software patching, backups
Cost	Based on instance type, storage, data transfer	Based on provisioned throughput and storage
Use cases	Transactional systems, BI, content management, e-commerce, gaming	High-scale, low-latency, IoT, gaming, ad-tech, e-commerce, mobile and web apps, real-time data processing and analytics

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