function system_update_7033 in Drupal 7
Move CACHE_AGGRESSIVE to CACHE_NORMAL.
Related topics
File
- modules/system/ system.install, line 2276 
- Install, update and uninstall functions for the system module.
Code
function system_update_7033() {
  if (variable_get('cache') == 2) {
    variable_set('cache', 1);
    return t('Aggressive caching was disabled and replaced with normal caching. Read the page caching section in default.settings.php for more information on how to enable similar functionality.');
  }
}