[Koha] koha mysql root password

HI! i'v installed koha with autoinstall file. My mysql must , by default, be without password for root. So, at autoinstall file, in the parameter MyqlRootPassword i put the LDAP password, that authenticates mysql root user by default. However, after i execute "installer.pl -i autoinstallfile", when i type mysql, it's asked to me mysql password, and i have to type the password, but i would like that it was like before, without ask me the mysql root password when i type mysql. It's really important in my case. Someone knows how to help me? Thank you very much. ------- Giovani Augusto Quintao Pereira Belo Horizonte - Brazil