Parallels

To upgrade mysql from 4.1 to 5.0 following are the steps:

1. Download the rpms's from mysql.com:
http://dev.mysql.com/downloads/mysql/5.0.html or http://downloads.mysql.com/archives.php?p=mysql-5.0

MySQL-server-5.0.22-0.i386.rpm
MySQL-client-5.0.22-0.i386.rpm
MySQL-devel-5.0.22-0.i386.rpm
MySQL-shared-5.0.22-0.i386.rpm
MySQL-shared-compat-5.0.22-0.i386.rpm

2. Install the downloaded packages:
 a. service mysqld stop
 b. rpm -Uvh *.rpm
 c. ln -s /etc/init.d/mysqld_app_init /etc/init.d/mysqld
 d. set_pre_maintenance
 e. set_maintenance
 f. set_post_maintenance
 g. service webppliance restart

3. Start mysqld service and verify that the mysqld service is running properly.