title: When and how do I have to create an Index in Grails?
body: <p>In Grails you can add <a href="http://grails.org/doc/latest/guide/GORM.html#5.5.2.6%20Database%20Indices" rel="nofollow">custom indices</a> to your domain classes.</p>
  
  <ol>
  <li>Does Grails generate indices by default for my tabels?</li>
  <li>Is there a rule which columns I have to use for my index?</li>
  <li>Do my queries change when an index is set?</li>
  </ol>