| Service | Description | AWS | Azure | GCP | Bluemix | 
|---|---|---|---|---|---|
| Relational database | SQL Database is a high-performance, reliable, and secure database you can use to build data-driven applications and websites, without needing to manage infrastructure. | RDS | SQL Database including PostgreSQL, MySQL and MariaDB  | Cloud SQL, PostgreSQL, MySQL | DB2 | 
| NoSQL—document storage | A globally-distributed, multi-model database that natively supports multiple data models: key-value, documents, graphs, and columnar. | DynamoDB |  Neptune  | Cosmos DB | Google Cloud Datastore | Cloudant | 
| NoSQL—key/value storage | A non-relational data store for semi-structured data. | DynamoDB  |  and SimpleDB  | Table Storage | Google Cloud Datastore  |  Google Cloud Bigtable  | Compose for ScyllaDB | 
| Caching | An in-memory–based, distributed-caching service that provides a high-performance store typically used to offload non-transactional work from a database.  | ElastiCache | Redis Cache | Memcache | Compose for Redis | 
| Database migration | Focuses on migration of database schema and data from one database format to a specific database technology in the cloud. | Database Migration Service | Database Migration Service  |  + Data Migration Assistant  | IBM Lift  |  Mass Data Migration  | 
				
															