title: mysql4 missing auto_increment ids
body: <p>We have a system which gets 1000's of queries a second and has several 1000 notes added a day. The note table is over 2.5 million records. We never delete a note and I have just found there are 19 missing id's in the id incremented field for that table for just today.</p>
  
  <p>Any thoughts?</p>
  
  <p>We are using mysql4 and are working on going to 5.
  We are also running on windows 2003</p>