All changes to the database scheme are collected in an SQL file. There's a file for each minor version jump, e.g.

UPDATE-SCRIPT_com_virtuemart_1.0.x-to-1.1.0.sql

The file can be found in the subdirectory /sql.

A user must see which version of VirtueMart this SQL patch file applies to and to which version it updates the db scheme.

In this case the SQL file would update a db scheme from version

VirtueMart 1.0.x to 1.1.0