[otrs] Changing DB

Hi, I changed the DB from system X to system Y (both on postgres) and changed the according line in Config.pm (version 1.9 I think i have running) This change is not detected by otrs, even when I restart apache it isn't detected. I don't have configuration lines for the db in the perl-preload script for apache. What should I do to let otrs look at the new db? Grtz Hans