Difference between AWS RDS and AWS DynamoDB as below
| Feature | AWS RDS | AWS DynamoDB |
|---|---|---|
| Database Type | Relational Databases (MySQL, PostgreSQL, Oracle, SQL Server, etc.) | NoSQL (Key-Value and Document) Database |
| Data Model | Tables with Rows and Columns | Key-Value and Document Data Models |
| Schema | Fixed Schema (SQL) | Flexible Schema (Schema-less for JSON data) |
| Scaling | Vertical Scaling (Upgrading Instance Types) | Horizontal Scaling (Auto-sharding) |
| Managed Service | Yes | Yes |
| Server Management | AWS Manages Servers | AWS Manages Servers |
| Multi-AZ Deployment | Yes | Yes |
| Read Replicas | Supported | Global Tables for Multi-Region Replication |
| Performance Consistency | Can Vary Depending on Configuration | Consistent, Single-Digit Millisecond Latency |
| Primary Key | Unique Identifier (e.g., Auto-incrementing Integer) | Primary Key (Simple or Composite) |
| Query Language | SQL | No SQL Query Language |
| ACID Transactions | Yes | Yes (Within Partition Key) |
| Backup and Restore | Automated Snapshots and Manual Backups | Point-in-Time Recovery, On-Demand Backups |
| Global Secondary Index (GSI) | Supported | Automatic Global Tables (Multi-Region) |
| Data Consistency Models | Eventual Consistency (Read Replicas) | Strong Consistency |
| Use Cases | OLAP and OLTP Workloads | Web and Mobile Apps, Gaming, IoT, etc. |
| Cost Model | Based on Instance Type and Storage | Based on Provisioned Throughput and Storage |
| Security Features | Encryption at Rest and in Transit, IAM | Encryption at Rest and in Transit, IAM |
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