Preparations

1. add these lines to the /system/config.php file to emulate master-slave configuration (set actual database connection settings):

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

2. replace SELECT ... in the ListSQLs property of the l unit config with aSELECT and save changes
3. replace SELECT ... in the ListSQLs property of the search-log unit config with aSELECT and save changes

Test Plan

1. go to Front-End (homepage)
2. confirm, that an SQL error happened
3. go to Admin Console
4. go to the Logs & Reports → System Log section
5. confirm, that:
   • a record, for just happened on the Front-End, SQL error was created
   • log message starts with [Server #1] , which means 2nd server = slave
6. go to Logs & Reports → Search Log section
7. confirm, that:
   • a record, for just happened on the Front-End, SQL error was created
   • log message doesn't start with [Server #...] text (where ... is server index), which means 1nd server = master