Sometimes RDS CPU utilization is going to very high

Question

We are using AWS RDS in MySQL For our app purpose. Normally that Cpu Utilization is running on 40% to 60%. Sometimes that CPU Utilization is going to be very high. That maintains 100% of CPU Utilization. I don't know-how is that possible and How I solve this. But, When I Upgrade our DB engine the problem was solved. After 3 days I downgrade the DB engine the CPU working fine. Two months later again the same problem is created. Again I upgrade and downgrade the CPU Engine.

Does anyone explain How can I solve this issue?

Answer 1

If the CPU Utilization is 40% - 60% normally, most likely there is a query running long to make the CPU Utilization to 100%.

Have you tried to run show full processlist during 100% CPU Utilization to find out if there is a long runtime query?

I would suggest the reason of upgrading and downgrading action solves the problem is that it is rebooted the RDS and killed the long runtime query.