Multiple mysql instances?

[NeoCHI]

On my dedicated server that only contains on xenforo forum, why is it that when I htop I can see 4 mysql instances?

 

[Slavik]

Probably just showing you all the threads.

 

[NeoCHI]

I've attached a screen shot of my htop.

Is that normal?

 

[NeoCHI]

So it's normal to have 4 mysql processes running all the time?