Preparations

1. in IDE:
   • open the /index.php for editing
   • replace $application->Run(); line with echo $application->NextResourceId(); line
   • save changes
   • open the /system/config.php file for editing
   • append this to end of the file:

$_CONFIG['Databases'] = array(
    array(
	'DBHost' => $_CONFIG['Database']['DBHost'],
	'DBUser' => $_CONFIG['Database']['DBUser'],
	'DBUserPassword' => $_CONFIG['Database']['DBUserPassword'],
	'DBLoad' => 1,
	'DBMaxLag' => 15,
    ),
);

• save changes

Part 1

1. don't apply the patch
2. open /index.php in the browser
3. confirm, that it hangs (page keeps loading) because lock was set in slave database, but data is changed in master database (they both reference the same database)
4. apply the patch
5. open /index.php in the browser
6. confirm, that page has loaded and next resource id is displayed on the page
7. open /index.php in the browser
8. confirm, that page has loaded and next resource id is displayed on the page (not the same as previous time)