Why is it good save to save sessions in the database?

Question

I have seen that codeigniter have facility to save session values in database.
It says saving session in database is good security practice.

But I think saving

Answer 1

It doesn't improve security in any way.

The most common and reasonable pattern to store sessions in database is when you have several frontend servers, so you need a shared session storage for them.

For downvoters: a file in filesystem isn't less secured than a record in database.