Полагаю, это считается "добавлением информации статически":
my %database;
%database = (
"MRD-300" => { Name => ..., Address => ..., Town => ... },
"HKQ-509" => { Name => ..., Address => ..., Town => ... },
"BXL-994" => { Name => ..., Address => ..., Town => ... },
);
То же самое можно сделать с помощью отдельных операторов присваивания:
my %database;
$database{"MRD-300"} = { Name => ..., Address => ..., Town => ... };
$database{"HKQ-509"} = { Name => ..., Address => ..., Town => ... };
$database{"BXL-994"} = { Name => ..., Address => ..., Town => ... };