title: Update mysql 32bit to 64bit
body: <p>I have like 10 biiiiiiiiiiiiiig mysql datebases and I have mysql 32bit, It can only use 3gb of ram memory... I need more so I need to update the mysql to 64 bit (the server has 32gb of ram memory). How can I update it without loosing data.</p>
  
  <p>I prefer not to make a backup and reupload it because the datebases are very very big...
  Is there any alternative?</p>
  
  <p>The OS is centos 5.8</p>