Database system used in Wix backend

I am evaluating WIX and would like to know which database system is being used by Wix backend, i.e. storing our collections, web pages, etc. Is it a MS SQL or Oracle DB or something else. Please let me know, as it plays an important role in my evaluation process.

From the query language it looks most likely a json based nosql db either mongodb or dynamodb

The database used by Wix is MongoDB.

What are the considerations for your evaluation?

thx, we concern about the stability of dbms