I have to look for a new hosting plan, and I am wondering about MySQL.

Many hosting providers are giving information like:
MySQL wersion: <ver>

But sometimes they also give some numbers, like 50 or 200.

I believe this is size of MySQL database.

The question is how large it suppose to be?

I know, I know, bigger = better, unlimited would be the best, of course.

Can someone share some information about that? 

Is (let we say 50MB) enough for a WPForum?

I would rather avoid accepting all kinds of attachements,

only pure text. Maybe it would be good for a start perhaps?

Can someone share like for example:
I have a wpforo for 2 years, I have <nb users>, we made around <this post>
my database is around this.

It is not for show off, of course :)