Select Code to Download

# Two scripts in parallel:
my $highest_id1 = $dbh->do("select max(id) from my_table"); # first sc
+ript
...
if ($highest_id1 == $highest_id2) {
    die
};

create table my_table (
    id integer primary key not null,
...
    id integer not null auto_increment,
    ....
);