I just experienced a major server breakdown in 1and1. MySQL crashed and when I tried to restart it the result would be negative:
Then I restarted the server and the problem persisted.
So my third action was to have a look at my Parallels Plesk web panel, and the result was that it would not load, showing a MySQL problem.
I then figured out that the problem could be a lack of memory, so I entered with ssh to the server and started listing directory sizes, using the great “du” linux command:
du -h –max-depth=1
until i found that the problem was in the backups folder:
then I deleted one of the backup folders and could restart mysql
service mysqld restart
Thanks to this guide for the du parameters: http://www.linfo.org/du.html