There are two good articles on the web that discuss this issue, but none of them is perfect for me. So I tried to add my stuff here.
The first is about installing sqlplus: http://www.danilovizzarro.it/2008/07/how-to-install-sqlplus-and-the-oracle-client-v102-on-a-mac-os-x-leopard-1054/
The second is about installing DBD::Oracle: http://blacka.com/david/2008/11/12/how-to-install-dbdoracle-on-mac-os-x/

To install sqlplus, you need download instantclient form oracle site, the following (64-bit) packages:

To install DBD::Oracle, you need one more package:

Once you download and unzip them, all the files will go to a directory called instantclient_10_2. Move this folder to something like /opt/oracle


$ sudo mv instantclient_10_2 /opt/oracle


You should set unix environment variable like the following:

DYLD_LIBRARY_PATH="/opt/oracle/instantclient_10_2"
export DYLD_LIBRARY_PATH
TNS_ADMIN="/opt/oracle/tns"
export TNS_ADMIN
ORACLE_HOME="/opt/oracle/instantclient_10_2"
export ORACLE_HOME


To connect to the an Oracle via sqlplus you can run the following command:

# sqlplus DB_USER/DB_PASS@//DB_HOST:DB_PORT/DB_SID


To install DBD::Oracle, you will need to download perl DBD package from CPAN, I chose version 1.32.

After you download the package, unzip it to ~/Download/DBD-Oracle-1.32, make sure you have set ORACLE_HOME and DYLD_LIBRARY_PATH correctly.
You need to set some soft link in $ORACLE_HOME (This is the key step most readme files failed to mention.)


$ cd /opt/oracle/instantclient_10_2/
$ sudo ln -s /opt/oracle/instantclient_10_2/ lib
$ sudo ln -s libclntsh.dylib.10.1 libclntsh.dylib
$ ls -l

lrwxr-xr-x 1 root admin 31 Oct 19 16:36 lib -> /opt/oracle/instantclient_10_2/
lrwxr-xr-x 1 root admin 20 Oct 19 16:32 libclntsh.dylib -> libclntsh.dylib.10.1


Now you can compile the DBD::Oracle Package now:

$ cd ~/Download/DBD-Oracle-1.32
$ perl Makefile.PL
$ make
$ sudo make install


In perl script you connect to oracle server using the following code:

#! /usr/bin/perl -w

my $sid = "host=host.xyz.com;sid=DBSID;port=1521"
my $dbh = DBI->connect("dbi:Oracle:$sid", $user, $pass) or die "ERROR: failed to connect db: $@\n";


type-1    2008/01/12 20:04:40    xxx    yyy
type-2    2008/01/11 10:05:20    aaa    bbb
type-2    2008/01/01 11:15:10    ccc    ddd

You want to count for each type, how many rows have time stamp > 2008/01/10

BEGIN{
ta1=0;
ta2=0;
}

{
split($2, a, " ");
split(a[1], ymd, "/");
split(a[2], hms, ":");

t0 = mktime("2008 01 10 00 00 00");
t = mktime(sprintf("%s %s %s %s %s %s", ymd[1], ymd[2], ymd[3], hms[1], hms[2], hms[3]));
if( t > 0) {
if($1 == "type1") {
if(t > t0) {ta1 = ta1 +1 }
}
if($1 == "type2") {
if(t > t0) {ta2 = ta2 +1 }
}
}

END {
print "type1", ta1, "type2", ta1;
}

cat filename | awk -F "\\t"
'BEGIN { t1=0; t2=0 } { if($1<10) t2+=$1; t1+=$1 } END { print t1, t2, t2/t1 }'

There is a number of such protocol packages, but usually, installing any one of them requires a number of other prerequisites:

Here is a process I have tested, if you do have super user privilege, you can ignore where "/path/to/install" is mentioned

0. $ sudo -s
0.1 setenv PERL5LIB /path/to/install/lib/site_perl
 
1. INSTALL OPENSSL
1.1 http://www.openssl.org/source/,
download http://www.openssl.org/source/openssl-0.9.8g.tar.gz
1.2 Unzip openssl-0.9.8g.tar.gz
1.3 Read INSTALL
1.4 $ ./config
1.5 $ make
1.6 $ make test
1.6 $ make install
 
2. INSTALL Net::SSLeay
2.1 Download it from http://search.cpan.org/~flora/Net-SSLeay-1.32/,
download http://search.cpan.org/CPAN/authors/id/F/FL/FLORA/Net-SSLeay-1.32.tar.gz
2.2 Unzip Net-SSLeay-1.32.tar.gz
2.3 $ perl Makefile.PL PREFIX=/path/to/install
2.4 $ make install # the Makefile requires -lz, on certain system, you can remove it
2.5 $ cd examples
2.6 $ get_page.pl www.cryptsoft.com 443 /
 
3. INSTALL IO::Socket::SSL
3.1 Download it from http://search.cpan.org/dist/IO-Socket-SSL/,
download http://search.cpan.org/CPAN/authors/id/S/SU/SULLR/IO-Socket-SSL-1.12.tar.gz
3.2 Unzip IO-Socket-SSL-1.12.tar.gz
3.3 $ perl Makefile.PL PREFIX=/path/to/install
3.4 $ make
3.5 $ make test
3.6 $ make install
 
4. INSTALL Net::SC
4.1 Download it from http://search.cpan.org/~gosha/Net-SC-1.20/,
download http://search.cpan.org/CPAN/authors/id/G/GO/GOSHA/Net-SC-1.20.tar.gz
4.2 Unzip Net-SC-1.20.tar.gz
4.3 $ perl Makefile.PL PREFIX=/path/to/install
4.4 $ make
4.5 $ make test
4.6 $ make install
 
5. INSTALL
5.1 Download it from http://search.cpan.org/~gosha/LWP-Protocol-http-SocksChain-1.4/,
download http://search.cpan.org/CPAN/authors/id/G/GO/GOSHA/LWP-Protocol-http-SocksChain-1.4.tar.gz
5.2 Unzip LWP-Protocol-http-SocksChain-1.4.tar.gz
5.3 $ perl Makefile.PL PREFIX=/path/to/install
5.4 $ make
5.5 $ make test
5.6 $ make install

Now you can use LWPGet

#!/usr/bin/perl -w
require 5.8.0;
use strict;
use lib "/path/to/install/lib/site_perl/5.8.7";
use LWP::Simple; use LWP::UserAgent;
use LWP::Protocol::http::SocksChain;
LWP::Protocol::implementor( http => 'LWP::Protocol::http::SocksChain' );
 
@LWP::Protocol::http::SocksChain::EXTRA_SOCK_OPTS = (
Chain_Len    => 1,
Debug        => 0,
Random_Chain => 1,
Chain_File_Data => [
'ip_of_socks_proxy:port:::5',
],
Auto_Save    => 0,
Restore_Type => 0 );
 
my $ua = new LWP::UserAgent $ua->agent('Mozilla/4.0 (compatible; MSIE 6.0; Windws NT 5.1)');
 
my $Url = $ARGV[0];
 
my $response = $ua->get($Url);
if($response->is_success) {
my $page = $response->content;
print $page, "\\n";
} else {
print STDERR "Fail to get $Url\\n";
}

• You can find the official download Link at http://dev.mysql.com/downloads/
• For MySql 5.0: http://dev.mysql.com/downloads/mysql/5.0.html#downloads

Step 2: Install the Binary
shell> /usr/sbin/groupadd mysql
shell> /usr/sbin/useradd -g mysql mysql
shell> cd /usr/local
shell> gunzip < /PATH/TO/MYSQL-VERSION-OS.tar.gz | tar xvf -
shell> ln -s FULL-PATH-TO-MYSQL-VERSION-OS mysql
shell> cd mysql
shell> scripts/mysql_install_db --user=mysql
shell> chown -R root .
shell> chown -R mysql data
shell> chgrp -R mysql .
shell> bin/mysqld_safe --user=mysql & # start mysql daemon

Step 3: Post-installation
shell> su mysql
shell> mysql/scripts/mysql_install_db

shell> mysql -u root -p
mysql> use mysql
mysql> GRANT ALL PRIVILEGES ON *.* TO 'user'@'localhost' IDENTIFIED BY 'password' WITH GRANT OPTION;
mysql> set PASSWORD FOR 'user'@'localhost' = PASSWORD('password');
mysql> FLUSH PRIVILEGES;
mysql> select * from mysql.user;

mysql> create database db_name;
mysql> SHOW DATABASES;
mysql> use db_name;
mysql> SHOWTABLES;

To start screen: enter screen -RD at Unix prompt.
To exit screen: you need to close all the terminals attach to it. Hit ctrl-d or enter exit for each terminal, screen will exit when the last terminal exits.

To detach screen (sent it to background): simply close the terminals window if you are using any ssh/telnet clients, or to do it explicitly by hitting ctrl-a then d.

To re-attach screen and bring you previous Unix session to foreground: enter screen -RD at Unix prompt. If you only have one screen running on the host, it will be brought to foreground right away. Otherwise, see below.
You can start multiple screens on one host, detach them to send them to background. When you enter screen -RD next time, screen will list all the detached ones, and you can choose to re-attach any one of them by screen -RD screen_name