Database Schema SCCS?

I'm looking for some software, either commercial or something someone has written, that will allow me to keep track of database schemas, and the changes made to the schema (add this table, delete this field, change this field from smallint to integer, etc) and allow me to version them. I'm looking for something more than just flat files under SCCS. Something more akin to a Data Dictionary that is maintained in the DBMS, along with descriptions of fields for documentation, and can allow me to say, "I want Ver 1.6 of the database for Customer X, and 2.6 for Customer Y." Any ideas? -- "You want to know what's scary? The Third World has 12 new members and some of them are nuclear armed!" Former US intelligence officer. Brian Douglass briand%anasaz.UUCP@asuvax.eas.asu.edu 602-870-3330 X657