WordPress at a glance
action is not described

after_db_upgrade action-hook . WP 2.8.0

Fires on the next page load after a successful DB upgrade.

Usage

add_action( 'after_db_upgrade', 'action_function_name_2271' );
function action_function_name_2271(){
	// action...
}

Where the hook is called

In file: /wp-admin/admin.php
after_db_upgrade
wp-admin/admin.php 44
do_action( 'after_db_upgrade' );

Where the hook is used (in WP core)

Does not used.