title: MySQL causes 100% disk utilization
body: <p>I'm running an MySQL (InnoDB) Database with XAMPP. I made many different, expensive queries on a table (~1,1M rows) and canceled them severel times because the took a very long time...</p>
  
  <p>If I'm starting MySQL right now, the disk utilization is instantly on 100% and doesn't decrease. Is it possible, that the previous canceled queries got queued and executed right now in the background? </p>
  
  <p><code>show processlist;</code> displays no running process...</p>
  
  <p>Any ideas? Thanks in advance!</p>
  
  <p><strong>UPDATE:</strong>
  Part of mysql-error.log</p>
  
  <pre><code>2016-09-09 10:04:56 2068 [Note] InnoDB: 128 rollback segment(s) are active.
  InnoDB: Starting in background the rollback of uncommitted transactions
  2016-09-09 10:04:56 2068 [Note] InnoDB: Waiting for purge to start
  2016-09-09 10:04:56 3478  InnoDB: Rolling back trx with id 426031, 90941 rows to undo
  </code></pre>
  
  <p>This might be the problem... but how to solve it?</p>