title: what is "Waiting for table level lock"?
body: <p>Why I have so many queries  when I using 'show processlist ' 
  <img src="https://i.stack.imgur.com/9kZUc.jpg" alt="show processlist; "></p>
  
  <p>And my CPU is <strong>600+% used</strong>  </p>
  
  <p><img src="https://i.stack.imgur.com/YxNnt.jpg" alt="enter image description here"></p>
  
  <p>Is there anything i can do to improve mysql performance? 
  Thanks</p>