[comp.databases] db's with data organization control

spencer@ocsmd.ocs.com (Spencer Hines) (12/20/90)

I'd be interested in hearing opinions/facts as to what commercial
database packages 
    a.  are fast with multiple users, and, more to the point
    b.  give reasonable controls to the user as to the database
        file layout (primarily for performance optimization).
Thanks for anything you can tell me.