title: dismax solr request handler MM , PS and Q.ALT
body: <p>I'm testing the dismax requesthandler , im trying to customize the mm  ( Minimum Match ) Parameter  ( i already looked at the documentation )</p>
  
  <pre><code> &lt;str name="mm"&gt;
   2&lt;-2 3&lt;-70% 5&lt;-50%  
   &lt;/str&gt;
   &lt;int name="ps"&gt;100&lt;/int&gt;
   &lt;str name="q.alt"&gt;*:*&lt;/str&gt;
  </code></pre>
  
  <p>I have 3 Questions :</p>
  
  <ul>
  <li><p>mm , i understood what it does , i want to verify if my param is ok , </p>
  
  <blockquote>
    <p>correct me if im wrong <br>
     2&lt;-2 3&lt;-70% 5&lt;-50% stands for ?  :</p>
    
    <ul>
    <li>if  1 or 2 terms match 100% of them</li>
    <li>if 3 to 4 match only 70% of them</li>
    <li>if 5 or more match only 50% </li>
    </ul>
  </blockquote></li>
  <li><p>ps : what is this param? Is it mandatory ? </p></li>
  <li>q.alt : the same i did not understand the utility of that one.</li>
  </ul>
  
  <p>Can you provide me some advise for the best configuration of DisMax ? </p>
  
  <p>Thank you ! </p>