Question

Is there any need for other database like mysql when working in multichain?

Answer 1

By itself, multichain don't need any database aside, it create its own db made of blocks.

If you need to implement module that you create that use mysql then it would be something else.

Comments

In my project I have an additional mysql dB in order to decoupling personal data with the ones shared all over the nodes

Answer 2

MultiChain uses an internal embedded database for all of its own purposes, so you only need an external database if your applications wants to do something more.