Batch process when too many notifications

[Sydney-o9]

Batch Processing in Doctrine

$q = $this->_em->createQuery('select n from merkNotificationBundle\Model\Notification n');
$iterableResult = $q->iterate();
foreach ($iterableResult AS $row) {
    // do stuff with the data in the row, $row[0] is always the object

    // detach from Doctrine, so that it can be Garbage-Collected immediately
    $this->_em->detach($row[0]);
}