in reply to Error "Can't use string ("machine1value4") as a SCALAR ref while "strict refs" in use at" from HoHoH

You're trying to deref the hash value, but it's not a reference. 
my $value_param = ${ $db->{$outerkey}->{$key2}{$key3} };

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should be 
my $value_param = $db->{$outerkey}->{$key2}{$key3};

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