After Plesk Updated to 11.5.30 we encounter a problem with the mysql. MySQL CPU usage always over 100% and ram usage increasing in a ladder pattern shown below.

There is no load on server. The graph below indicates that the date of problem encountered matches with the plesk update on my server (11.5.30 Update #38, last updated at Mar 28, 2014 06:50 AM)

I've made a deep research about that problem but could not find any solution.

There is no load on server. The graph below indicates that the date of problem encountered matches with the plesk update on my server (11.5.30 Update #38, last updated at Mar 28, 2014 06:50 AM)

I've made a deep research about that problem but could not find any solution.