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$dbh1 = DBI->connect($DSN,$sqluser,$sqlpass)
    || die "Cannot connect: $DBI::errstr\n" unless $dbh1;
$dbh2 = DBI->connect($DSN2,$sqluser2,$sqlpass2)
    || die "Cannot connect: $DBI::errstr\n" unless $dbh2;

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sub my_query {
  my $my_dbh = shift;
  my $query = shift;
...
}

my_query($dbh1, "select * from potatoes");