constant MAINTENANCE_MODE

  1. 7.x-3.x platform/drupal/install_6.inc MAINTENANCE_MODE
  2. 7.x-3.x platform/drupal/install_7.inc MAINTENANCE_MODE
  3. 7.x-3.x platform/drupal/install_8.inc MAINTENANCE_MODE

File

platform/drupal/install_7.inc, line 13
Rebuild all the caches

Code

define('MAINTENANCE_MODE', 'install')