Memory maxing out on forum

[DreadsUK]

OK, so our server had to be rebooted the other morning because we'd maxed out the memory. This is the first time this has happened so im looking at whats best to be done.

The server hosts have suggested we upgrade to a bigger memory package.I am wondering if there are practical things i can do this end first.

Is there a way we can work out where most of the memory is going? Are there things that can be deleted that won't then return 404 errors?

Thanks