It sometimes happens that if your database server crashes, you may find that:

• QM is not working because it cannot access the database
• Qloaderd is not working because it cannot write to the queue_log table
• You get weird errors when updating from an older version of QM

This sometimes happens even on systems that seemed to work fine for a long time.

In order to fix these issues, you should:

1. stop MySQL - THIS IS EXTREMELY IMPORTANT
   /etc/init.d/mysqld stop
2. check tables using myisamchk (use the same case as written here):
   myisamchk -c /var/lib/mysql/queuemetrics/*.MYI
3. if any error is shown, repair tables:
   myisamchk -r /var/lib/mysql/queuemetrics/*.MYI
4. after that, restart Mysql:
   /etc/init.d/mysqld start