$sql='SELECT a.serial_num user_serial FROM device a WHERE (LOWER(a.name) = ? OR a.mgmt_ip_addr = ?)';
$cmd = $dbh->prepare($sql);
$cmd->execute('test','test');

while ($row = $cmd->fetchrow_hashref())
{
	.....

}

##</code><code>##

DBD::Oracle::st fetchrow_hashref failed: ORA-24345: A Truncation or null fetch error occurred (DBD ERROR: ORA-01406 error on field 1 of 1, ora_type 1) [for Stat
ement " SELECT
                a.serial_num user_serial
        FROM
                device a
     WHERE

       (LOWER(a.name) = ? OR a.mgmt_ip_addr = ?)

" with ParamValues: :p1='test', :p2='test'] at data.cgi line 720.