@san_98 In your screenshot I do not see any Parallel Chunks and no database access, but if you are fine we are fine 
For the fun of it I expanded on @MartinDDDD workflow and constructed a parallel access with a database node calling sub-workflow(s) that would then use this connection. So far it seems to work although any benefits in speed might depend heavily on the actual database(-connetion) supporting parallel access.
The callee workflow does look like this:
If you want you can explore this further