System is working on some queries already
From Kolmisoft Wiki
Cause
Solutions
Wait
Kill MySQL Query
1. Log in to the server over SSH.
2. Connect to the mysql
mysql -u root -pkolmisoft
3. Check processlist
select * from INFORMATION_SCHEMA.PROCESSLIST where db = 'mor'\g
4. Kill process which is overloading mysql
mysql> kill 2488509;
Precaution
Setting for users to limit for how many days they can watch statistics
Check slow query log