WordPress DATABASE Update Manually?

Visit /wp-admin/upgrade.php on each site to manually upgrade the database e.g.

http://www.example.com/wp-admin/upgrade.php

This happens if you have a site on the WordPress network that doesn’t resolve or if you have spoofed DNS locally but not on the server – your computer knows that www.example.com points at 127.0.0.1 but your local server is still resolving www.example.com to its actual address when PHP does its CURL call.