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  1. or download this
    '"dbi:Oracle:host=localhost;sid=nms"'
    
  2. or download this
    "dbi:Oracle:host=localhost;sid=nms"
    
  3. or download this
        # totally wrong code
        my $dsn = "@array[0], '@array[1]', '@array[2]'";
        my $dbh = DBI->connect($dsn);
    
  4. or download this
        my $dbh = DBI->connect(@array);