title: Truncate Slow Query Log in MySQL
body: <p>What's the safest way to truncate the MySQL slow query log (under Linux primarily, but Windows would be handy to know) while MySQL is running?</p>
  
  <p>By safe I mean:</p>
  
  <ul>
  <li>Mustn't cause any permissions problems</li>
  <li>Mustn't jump back to its original size next time its appended to</li>
  </ul>