Restarting mysqld on CentOS 6.6

I'm trying to restart my mysqld process on CentOS 6.6. I have root access to the server and when I run top, this is the first line:

 PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
3874 mysql     15   0 2859m 336m 7188 S 120.5 16.4  74730:50 mysqld

Clearly there is an issue there (and I may need to increase the DB server since it's maxing out) but the first step I want to take is to put the process through a power cycle to restart it since it hasn't been restarted in a very long time.

I've tried as root to do many different processes:

service mysqld restart (I get service not found)

If I run which mysqld I get /usr/sbin/mysqld . I tried:

/usr/sbin/mysqld restart

That didn't work. I tried:

/etc/init.d/mysqld restart

That didn't work. Do I need to be logged in as the mysql user to do this? I figured root would be able to do this but I guess I just can't find the correct way to restart the server.

Thanks for your help!

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