I got a big DVD collection with lots of datas, and a lot of actors and actresses are in my database,  which doesn't perform in any films of my collection. How can I delete those actors and actresses, also crewmembers, who isn't in use by any DVD's profile ? 
sorry for the bad english.

I believe that this is easily achieved by going to

tools -> options -> utilities -> repair database.

Part of the process gets rid of any unused information (including actors)... I think... I'm sure that someone will tell me if I'm wrong.

Stuart

Wow, thanx a lot.
I've got 5402 DVD profiles
1153 unused crew members and 2528 unused cast members.

You saved me hours and hours of deleting those members entry for entry.

Thanx a lot ! ! ! !