PDOStatement execute memory issue?

Hi everyone, I'm working on a script that downloads archived fax images (TIFFs and PDFs) from a MS SQL Server using the PDO ODBC driver. I get the below error regardless of which fax I try to get from the database. Each fax is a different size, and both of the memory allocation numbers are always the same: Fatal error: Out of memory (allocated 262144) (tried to allocate 4294967295 bytes) in C:\Inetpub\wwwroot\FMarchive\library\faxInbound.php on line 81 The above error happened when querying a fax with a size of 17723 bytes. According to my phpinfo(); page, the memory_limit is 128MB. My machine has the below specs: Windows Server 2003 SP2 IIS 6 2GB RAM Microsoft SQL Server 2005 SP2 PHP 5.2.4 Here is the excerpt from my code: public function downloadFax($id, $attid, $attsize) { try { $stmt = 'SELECT filename, attdata FROM fm_faxin_att WHERE id = :id AND attid = :attid'; $pstmt = $this->db->prepare($stmt); $pstmt->bindValue(':id', $id); $pstmt->bindValue(':attid', $attid); $pstmt->execute(); // this is the Line 81 referenced by the error message $pstmt->bindColumn('filename', $filename, PDO::PARAM_STR); $pstmt->bindColumn('attdata', $data, PDO::PARAM_LOB); $pstmt->fetch(PDO::FETCH_BOUND); return array('attdata' => $data, 'filename' => $filename); } catch (PDOException $e) { die($e->getMessage()); } } Any ideas? Regards, Carlton Whitehead