>>You can still probably do it if the database is not busy or you can try to increase timeout.
>
>In my case, nobody was in the database. And, the timeout message appears immediately. So, probably because of its size, this has been rejected automatically. So, this is why I am saying that the scripting approach would probably be the only remaining possiblity to change such a structure.

It always better to run all your actions as a script anyway.