Why such a load of RAM on CentOS?

Question

linux

Ordered VPS. CentOS 7.3x64. I flooded one site (which has zero traffic) and saw this picture. A bunch of mysql processes and more than half of the memory eaten
It seems to me that this is not normal. What can be done?

Answer 1

1) this is not a bunch of processes, it's a bunch of threads
2) this is quite normal, the database uses memory for caching data in order to pull the disk less often and respond faster. the maximum size is configured in the configs