Hello Chander, thank you very much. I tried to do in your way ad the installation works! I downloaded the perl(DBI) .rpm and I installed it the first time using the command:
rpm -Uvh perl-DBI-1.50-1.i386.rpm but I got back an error about one glibc library not founded, so I use this format: rpm -Uvh --nodeps perl-DBI-1.50-1.i386.rpm and the installation finished without problems. Then, I installed both MySQL-server-standard-5.0.18-0 .rhel3.i386.rpm, with which I have had the problem, and MySQL-client-standard-5.0.18-0.rhel3.i386.rpm and all went in the right way. Greetings Francesco Vincenti