title: Derby vs PostgreSql Performance Comparison
body: <p>We are doing research right now on whether to switch our postgresql db to an embedded Derby db. Both would be using glassfish 3 for our data layer. Anybody have any opinions or knowledge that could help us decide?</p>
  
  <p>Thanks!</p>
  
  <p>edit: we are writing some performance tests ourselves right now. Looking for answers more based on experience / first hand knowledge</p>