Message Tracing – Site Level

From what I can figure out to get Message Tracing to work in the engine you need to provide an “external” database for the tracing to become available.  

What I do not know is what fields/columns is Message tracing expecting so that it can save what its to display things properly.  I have looked in the Help text but cannot file a schema example.  Now I will say I might have missed it.

Does anyone have an idea as to what the table needs to look like for Messages tracing to work?

Thanks

Rob