switching from 5.7DR6 to 5.9DR2
 

is there a major difference in database tables..

i want to switch from the 5.7dr4 to 5.9dr2 but keep my same database i am using.. i really dont want to wipe my world.. so how much difference are the databases.. and how would i do this? is there a tutorial on this? somewhere?

There have been two changes since 5.7 that I know of. The cfg change - the zones no longer use the zonename.cfg files, it's taken directly from the zone table in the db. And also the AA table changed a bit and a new table was added in addition to it. You should be able to find all of the sqls(and even info on which sqls in the changelog) in cvs.