Database vendor choice is one of the factors affecting the cost of provision of data. Even when licensing pricing is unpredictable we need database pricing to be low and stable. The pricing model can be per storage/ per server or user based where users need to create their separate profiles. Another type of models is in which cost structure have an influence over architecture where customers are not able to get all the expected cloud features such as independently scaling computing and storage. Computing and storage should be priced independently. This works well in case of the seasonality of data where one only has to pay for what he uses. Read more at https://gigaom.com/2017/05/08/know-your-embedded-database-cost/