title: file-based or database-based caching
body: <p>I am developing a site with codeigniter and would like to know which caching system will be best to use with a very large database (above 100k records with many join queries ) so my questions is:</p>
  
  <p>is file-based caching is good or I will have some I/O issues?
  or should I write a new driver (I am not sure if codeignter have such driver ) for caching which will store cache in database as key,value pairs?</p>
  
  <p>I cant use memcache or APC due to large size of rows so which should i choose file-based or database-based.</p>
  
  <p>Thanks for any input.</p>