Hi Carlos
The TMF Open APIs are just that, a specification for APIs. They make no assumptions about the architecture of the underlying software implementation of the API functionality.
So it's up to you to choose a persistent storage that meets your business and non-functional needs.
It could be argued, due to the nature of the Open API payloads (JSON documents), that non-SQL document databases would be a good match, but really there's a lot more to discuss, such as transaction support, reliability, scalability, and a whole lot more.
Hope it helps.
------------------------------
Jonathan Goldberg
Amdocs Management Limited
Any opinions and statements made by me on this forum are purely personal, and do not necessarily reflect the position of the TM Forum or my employer.
------------------------------