# Modify DBH LongReadLen for long binary object...
    my $dbh = __PACKAGE__->db_Main();
    my $current_LongReadLen = $dbh->{LongReadLen};

    # need to dynamically set to the length of your record
    # it's hardcoded to 512Kb for example...
    $dbh->{LongReadLen}     = 512 * 1024; 
    ...