I looked around on my ActivePerl 5.20 machine to see what modules would already be there without me having to install anything. Turns out the super light-weight Config::Tiny ships with the distribution. In the doc, more sophisticated versions are mentioned. The code is similar to the YAML example, except the format is in Windows .ini format.

#!user/bin/perl
use strict;
use warnings;
use Data::Dumper;

use  Config::Tiny;

my $file=<<END;
[DBname]
Port Number = 1000
host name = abc01.xyz.com
username = gvenkat
password = ganesh99
END

my $Config = Config::Tiny->new;
$Config = Config::Tiny->read( \$file );

my $portnum = $Config->{DBname}->{'Port Number'};
print "$portnum\n";
my $hostname = $Config->{DBname}->{'host name'};
print "$hostname\n";
my $username = $Config->{DBname}->{'username'};
print "$username\n";
my $password = $Config->{DBname}->{'password'};
print "$password\n";

my $href = $Config->{DBname};
print Dumper $href;

__END__
1000
abc01.xyz.com
gvenkat
ganesh99
$VAR1 = {
          'username' => 'gvenkat',
          'Port Number' => '1000',
          'host name' => 'abc01.xyz.com',
          'password' => 'ganesh99'
        };
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I'd store any other config stuff in the DB. Looks like the purpose is just to "get going" without having to modify the code itself.

Update: I looked at the post from Your Mother at Re: Read from a header file like C. That seems to be the way to go for MySQL. Similar format to the above.