I am using the following code in an application based on ZF1:
$select = $db->select()->from('table', array('id', 'int', 'float'))->limit(10000, (($i - 1) * 10000));
$data = $select->query();
while ($row = $data->fetch()) {
# ...
}
This operation is happening in a foreach loop for some 800 times. I output the memory usage for each pass and can see it increasing by about 5MB per pass. I suppose that is because Zend apparently does not free the result from the query once the pass is complete. A simple unset didn't solve the issue. Using fetchAll also did not improve (or change) the situation.
Is there any way to free the result from a Zend_Db_Statement_PDO thus freeing the memory used by it? Or do you suspect another reason?