Most of the applications do require a Relational Database to store and retrieve data. With the introduction of Cloud based database by various Cloud vendors enable organisations to pay a subscription fee to own a database which would be fully managed by the Cloud provider.
All the major software vendors such as Oracle, Amazon, Google and Microsoft do have options to subscribe to a Database Cloud Service.
This blog post shows how quickly and easily an Oracle Database can be provisioned in the Oracle Cloud Infrastructure Classic (OCI Classic) environment. Please note that OCI Classic was previously known as Oracle Public Cloud (OPC).