Excellant Sources For Information On Tuning And The Optimizer

• Jonathan Lewis's blog:-
  http://jonathanlewis.wordpress.com/
  
  
• Blog of Greg Rahn from the Oracle Real World Performance Group
  http://structureddata.org/
  
  
• Wolfgang Breitlings web site
  http://www.centrexcc.com/
  
  
• The Oracle Optimizer Team blog
  http://optimizermagic.blogspot.com/
  
  
• Papers by Christian Antognini
  http://www.trivadis.com/e/knowhow/publikationen/index.asp