Sometimes you have to make sure that some environment variables are set.

For example some settings for a connection to a database:

BEGIN {
  $ENV{NLS_LANG} = 'GERMAN';
  $ENV{NLS_DATE_FORMAT} = 'YYYY-MM-DD';
  $ENV{NLS_TIMESTAMP_FORMAT} = 'YYYY-MM-DD HH24:MI:SS';
}

use DBI;
my $dbh = DBI->connect('dbi:Oracle:db', 'user', 'pw');
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