Monitoring A User's SSH? Also... Mysqld Running At 103%cpu & Stats Overload Emails

I have 3 questions.

1.) I have a user that's kinda knows a lot about linux. More than me. He has a lot of stuff on the system which I have no idea what it is. Is there any way I can install a SSH log, so I can monitor what he does in shell?

2.) My server seems REALLY sluggish. I ran a top in shell, and mysqld was taking up from 70% to 110% of the cpu. Is there any way to fix this or find out why? I've restarted the server, and it's fluctuating between 50% and 90% now.

3.) I think this MIGHT be related to the sqld issue, but I've received about 12 emails saying
Quote:

"[statscheck] Stats/Server Overload on my server". "MPORTANT: Do not ignore this email.

This is cPanel stats runner on server1.cewxp.com!

While processing the log files for user cewxp, the cpu has been
maxed out for more than a 6 hour period. The current load/uptime line on the server at the time of this email is 15:49:16 up 5 days, 10:52, 2 users, load average: 27.59, 31.36, 31.83"

and also another email

Quote:

IMPORTANT: Do not ignore this email.

This is cPanel stats runner on server1.cewxp.com!

While processing the log files for user vegapunk, the cpu has been maxed out for more than a 6 hour period. The current load/uptime line on the server at the time of this email is 12:34:26 up 5 days, 7:37, 2 users, load average: 19.90, 17.59, 17.97