title: Get MySQL data without stressing server
body: <p>I'm wondering what the best way is to prevent my server from being stressed when I want to get a lot of data using PHP.</p>
  
  <p>Convert all my data to an XML sheet? Use caching?</p>
  
  <p>The data comes from many different databases and different tables.</p>
  
  <p>Any ideas?</p>
  
  <p>Thanks in advance</p>