You can find the software HERE but you will need to create an Oracle account first. Be warned that the Oracle site can be a little frustrating. You will want to download Oracle Database 10g Express Edition (either Western European or Universal version depending on your language requirements), which represents the Server, and Oracle Database 10g Express Client, which allows remote access to the server from another machine.
Oracle provides detailed documentation on these, including an Installation Guide, a Getting Started Guide and an Online Tutorial. While these are welcome, they tend to cover more options than you really need and so they can be a bit confusing. This note trims off that excess verbage and explains what I needed to do to install the database on a Linux Fedora 5 server.
Oracle XE Server Installation
1. Check the prerequisites in the Installation Guide
For hardware these are basically 512 MB memory, 1.5 GB disk.
You'll need at least 1024 MB of swap space. Check that with:
# free -mIf the total for the Swap line is less that 1024 then you need to add a swapfile of an appropriate size. I'll try and add a short note about that to this site when I get the chance - otherwise google for it.
You'll need the linux packages glibc (2.3.2 or higher) and libaio (0.3.96 or higher). You should have glibc already there but you'll have to install libaio (as root):
# yum install libaioThere are also a bunch of kernel parameters listed in the installation guide. I didn't have to mess with these.
2. Install the Downloaded RPM
# rpm -ivh oracle-xe-10.2.0.1-1.0.i386.rpmIf you've met all the prerequisites, the rpm should install smoothly
Preparing... ########################################### [100%]
1:oracle-xe ########################################### [100%]
Executing Post-install steps...
You must run '/etc/init.d/oracle-xe configure' as the root user to
configure the database.
3. Run the Configuration Script
# /etc/init.d/oracle-xe configureAccept the defaults for the two questions about ports, provide an administrator password and set the database to start on boot. The script will then do a load of work in the background to configure things properly.
This can take quite a while. Run top in another window if you want reassurance that things are happening.
4. Access the Database via its Web Site
On the server with the database, open up a browser and go to http://localhost:8080/apex.
Login as system and give the password that you set earlier. If you want to access this site from other machines on your network then go Administration->Manage HTTP Access and select Available from Local Server and Remote Clients.
You can enable a test database by going to Administration->Database Users->Manage Users and clicking on HR. Provide a password (such as 'hr') and change Account Status to unlocked and click the Alter User button. This test database is handy for testing later on.
5. Set Some Environment Variables
As root, open /etc/bashrc in an editor and add this line at the bottom of the file:
. /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/oracle_env.shWhen you create a shell this will set a few environment variables that are required in order to access the database. These include LD_LIBRARY_PATH, ORACLE_HOME and ORACLE_SID. Look for them in the output of printenv when you create a new shell.
That's it for installing the server...
Oracle XE Client Installation
You would install this on a remote machine that wants to access the database server over the network.
1. Check the prerequisites
Nothing significant here, except the glibc and libaio packages, as above:
# yum install libaio2. Install the Downloaded RPM
This gave me a couple of errors but they didn't appear to be a problem...
# rpm -ivh oracle-xe-client-10.2.0.1-1.0.i386.rpm3. Setup the Environment Variables
Preparing... ########################################### [100%]
df: `/usr/lib/oracle': No such file or directory
expr: syntax error
/var/tmp/rpm-tmp.86099: line 23: [: -lt: unary operator expected
1:oracle-xe-client ########################################### [100%]
Executing Post-install steps...
As root, open /etc/bashrc in an editor and add this line at the bottom of the file:
. /usr/lib/oracle/xe/app/oracle/product/10.2.0/client/bin/oracle_env.sh4. Access the Remote Server
If your paths are setup correctly then you can access sqlplus from a shell. Here I am accessing the HR test database on server testbed. The connect syntax is username/password@host
# sqlplus /nologYou see a load of output returned by the server, indicating that everything is set up correctly.
SQL*Plus: Release 10.2.0.1.0 - Production on Mon Jan 29 10:21:21 2007
Copyright (c) 1982, 2005, Oracle. All rights reserved.
SQL> connect hr/hr@testbed.int.craic.com
Connected.
SQL> select * from jobs;
That's it... fairly simple installations... you'll need to look elsewhere for guidance on actually creating tables and entering data. I'll add a guide to using Oracle as a backend database with Rails shortly.
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