Drupal database update

Use this utility to update your database whenever a module, theme, or the core software is updated.

For more detailed information, see the upgrading handbook. If you are unsure what these terms mean you should probably contact your hosting provider.

Back up your code. Hint: when backing up module code, do not leave that backup in the 'modules' or 'sites/*/modules' directories as this may confuse Drupal's auto-discovery mechanism.
Put your site into maintenance mode.
Back up your database. This process will change your database values and in case of emergency you may need to revert to a backup.
Update your files (as described in the handbook page linked above).

When you have performed the steps above, you may proceed.