Is it possible to upgrade mysql 5.1 to 5.5
Update MySQL 5.1 to 5.5
Yes, it is true that you can easily update your MYSQL version from MYSQL 5.1 to MYSQL 5.5. But there is a risk of breaking something from this upgrade if guidelines are not followed correctly.
So, i would suggest you to ask your Web Host Manager to do it for you.. or otherwise go through the best tutorial..
However to update from MySQL 5.1 to 5.5, it is good to take the data back up in advance to avoid any data loss.
Here are the few steps:
cPanel - Upgrading from MySQL 5.1 to 5.5 is quite easy.
Step 1: Backup your MySQL data using mysqldumpStep
2: Upgrade MySQL 5.1 to 5.5 through cPanelStep
3: Copy my.cnf and restart MySQLStep
4: Restore the data if there is some issue with your dataStep
5: Verify the applicationsHere is the cPanel Mysql upgradation tutorial