Transactions for the performance of multiple inserts?

Question

Database

I heard that if you wrap n inserts in a transaction, then I / O interactions will not be n (as if we were doing inserts one at a time, without involving a transaction), but 1.

Is this true?
If so, which databases does it cover?
Is the lowest transaction isolation level appropriate?

Answer 1

Transactions are not used to optimize data recording, but where necessary according to business logic. This is how all actions with the base should occur or none.
By default, it's best to always commit as soon as possible.