I have the following error with one of our web applications -
Query3 failed: Error writing file \'/tmp/MY1fnqpm\' (Errcode: 28) ... INSERT MailList... (remo
You can also try using this line if the other doesn't work:
du -sh /var/lib/mysql/database_Name
You may also want to check with your host and see how big they allow your databases to be.