Error ORA-12545: Connect failed because target host or object does not exist (DBD ERROR: OCIServerAttach) connecting to DBI:Oracle:host=<hostname>;sid=<sid>;port=1521 

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# DBI Initializations
my $driver = 'Oracle';
my $hostname = 'host=oradev;sid=oradev;port=1521';
my $user = 'user';
my $password = 'password';
my $dsn = "DBI:$driver:$hostname";

my $dbh = DBI->connect($dsn,$user,$password) or croak "Error $DBI::err
+str connecting to $dsn\n";