The actual usage is very straight forward and the only unusual aspect is that this maintenance script uses a special load-group that requires special handling:
pruneItemsPerSite.php
$dbr = $loadBalancerFactory->getMainLB()->getConnection( DB_REPLICA, [ 'vslow' ] ); $dbw = $loadBalancerFactory->getMainLB()->getConnection( DB_PRIMARY );
pruneItemsPerSite.php
$loadBalancerFactory->waitForReplication();
IMPORTANT: When using load-groups (e.g. 'vslow' in ConnectionManager methods, it is important to remember that these replace the groups that were pre-defined by the DomainDbFactory. It should be considered whether the load groups that are usually added in the factory e.g. \Wikibase\Lib\Rdbms\DomainDb::LOAD_GROUP_FROM_REPO , need to be readded here again.