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  1. or download this
    
sub runSomeQueries
...
    $sth->execute($locationID);
}
  2. or download this
    my $dbh_primary = DBI->connect(XXXX);
my $dbh_backup = DBI->connect(YYYY);
runSomeQueries($dbh_primary);
runSomeQueries($dbh_backup);
  3. or download this
    my $dbh = DBI->connect(XXXX);
my $dbh_tx = DBI->connect(XXXX, AutoCommit => 0);
...
{
    $dbh->rollback();
}