public function iterate($table)
{
$data1 = $this->dbiterator1->next(ArrayDiff::$size);
$this->sourceBucket = array_merge($this->sourceBucket, $data1);
$data2 = $this->dbiterator2->next(ArrayDiff::$size);
$this->targetBucket = array_merge($this->targetBucket, $data2);
$this->tag($table);
}