I come from a MySQL background, and I have been given the challenge of learning Oracle. I can’t just play around with our customers’ databases, but I remembered that Paul Vallée said that there is nothing wrong with learning on company time. So I decided to install my own Oracle database, which I’ll be free to destroy in every way I can think of… and of course, free to bring it back to life. Recovering from crashes will probably be the most difficult part of my adventures in the Oracle world, but let’s take one step at a time, shall we?
Now, onto Oracle 11g (beta 5) on Ubuntu 7.04 (Feisty Fawn). One little issue is that Ubuntu is unsupported by Oracle. So, through this text, we will trick the Oracle installer into thinking it’s actually running on a Red Hat box.
This tutorial was based on a document which can be found here. I have adapted it for Oracle 11g.
Get a copy of Ubuntu 7.04 and install on a machine. I’m using the 32-bit version here (as well as for Oracle). Next, make sure your system is up-to-date. A simple
apt-get update followed by a
apt-get upgrade will do the trick, although you may prefer using the GUI Synaptic Package Manager — it’s entirely up to you what method you choose. However, I much prefer to use the command line.
As you go through updates, sometimes a reboot will be needed (usually to boot from a newer, recently-updated kernel). Sometimes it’ll just ask you to restart your web browser or some other program as a new version is installed.
It’s important to have a few gigabytes of free disk space and a total of 1 GB of memory before starting this. This 1 GB of memory can be RAM alone or the combination of RAM and swap space. Of course, since everything runs faster when in RAM, the more of it, the better.
Very important: get Java running before trying to move on. My guess is that almost any JRE (java runtime) or JDK (java development kit) will work. I’m not sure which is the minimum version required: I used Sun JDK 1.5.
Install some system requirements. There are a few packages that I had to install on this box (it was a recently installed system which didn’t have all these packages). After several attempts of installing Oracle, the equivalent command-line for installing all the necessary packages at once was something like this:
# apt-get install gcc make binutils lesstif2 libc6 libc6-dev rpm libmotif3 libaio libstdc++5 gawk alien libg++126.96.36.199-glibc2.2 ksh gcc-3.3 g++-3.3 libstdc++5
It’s possible that when installing the packages mentioned above, the installer will install some other prerequisites as well, as these packages themselves may have prerequisites.
Choose where you are going to install your Oracle 11g server and create the
ORACLE_BASE directory. This is the place where Oracle will be installed. Make sure there is at least 3 GB on the partition/mount point before moving to the next step. After installed, my basic installation took about 3.4 GB on disk (without the starter database!). As your database grows, it will need more space. Reserve a total of at least 6 GB for the unpacked installer and the basic installation. You can get rid of the installer files afterwards.
# mkdir -p /u01/app/oracle
Add a few users and change groups to make the installer more comfortable. Remember, we are tricking the installer to think it’s installing on a Red Hat box.
# addgroup oinstall # addgroup dba # addgroup nobody # useradd -g oinstall -G dba -p password -d /home/oracle -s /bin/bash oracle # usermod -g nobody nobody
usermod command is needed since because when running, the installer looks for a user called
nobody which is part of a group named
nobody (in Ubuntu, the user
nobody it’s assigned to
nogroup by default).
Make some symlinks. Apparently, the installer uses absolute paths, so it must find the binaries in the right places.
# ln -s /usr/bin/awk /bin/awk # ln -s /usr/bin/rpm /bin/rpm # ln -s /usr/bin/basename /bin/basename
We need to mimic the
/etc/rc.d directory structure of a Red Hat box. We do this with more symlinks:
# mkdir /etc/rc.d # ln -s /etc/rc0.d /etc/rc.d/rc0.d # ln -s /etc/rc2.d /etc/rc.d/rc2.d # ln -s /etc/rc3.d /etc/rc.d/rc3.d # ln -s /etc/rc4.d /etc/rc.d/rc4.d # ln -s /etc/rc5.d /etc/rc.d/rc5.d # ln -s /etc/rc6.d /etc/rc.d/rc6.d # ln -s /etc/init.d /etc/rc.d/init.d
I’ve created a file called
/etc/redhat-release and put only one line on it. The same can be achieved by issuing the following as root:
echo "Red Hat Linux release 4" > /etc/redhat-release
We tweak the system default limits on a few items. The shared-memory are specially important, since Oracle relies on shared memory for process communications. There is a file called
/etc/sysctl.conf and it should have these lines on it:
fs.file-max = 65535 kernel.shmall = 2097152 kernel.shmmax = 2147483648 kernel.shmmni = 4096 kernel.sem = 250 32000 100 128 net.ipv4.ip_local_port_range = 1024 65000 net.core.rmem_default = 1048576 net.core.rmem_max = 1048576 net.core.wmem_default = 262144 net.core.wmem_max = 262144
Now that they are in a config file, these limits will be issued automatically at the next boot sequence. For now, we need to make the system re-read the config file:
# sysctl -p
Now, what do those parameters and values actually mean?
fs.file-maxsets the maximum number of open files that can be handled by the Linux kernel.
kernel.shmalldetermines the total amount of shared memory to be allocated in pages. In this example, I’ve set it to 8GB, which is way above the amount of memory I can handle in my box, even with swap.
kernel.shmmaxcontrols the maximum amount of memory to be allocated for shared memory which in this example is 2GB.
kernel.shmmnidefines the maximum number of segments system-wide.
net.core.rmem_maxdefine the default and maximum read buffer queue for network operations (1 MB in this example)
net.core.wmem_maxdefine the default and maximum write buffer queue for network operations (256 KB in this example)
net.ipv4.ip_local_port_rangetells the kernel the port ranges that will be used for outbound connections.
kernel.semhas four parameters:
SEMMSL– semaphores per array
SEMMNS– max semaphores system-wide (
SEMOPM– max operations per semop call
SEMMNI– max number of semaphore arrays
To check your current semaphores configuration, you can run
cat /proc/sys/kernel/sem or
ipcs -ls. On my machine, after the modifications on
sysctl.conf, these commands output:
# cat /proc/sys/kernel/sem 250 32000 100 128 # ipcs -ls ------ Semaphore Limits -------- max number of arrays = 128 max semaphores per array = 250 max semaphores system wide = 32000 max ops per semop call = 100 semaphore max value = 32767
(I really don’t know if these are enough or too much, but I’ll keep you posted.)
For a better understanding of these kernel-tweaking settings, I’d recommend these resources:
Add these lines to
/etc/security/limits.conf, letting the
oracle user use more resources than the defaults allowed. You may notice that all these values are a power of 2 minus one. When soft limits are exceeded, you’ll get a warning; the hard limits can’t be exceeded in any situation: you’ll get an error. I’m not completely sure, but I think these limits apply to each session/login (and since Oracle doesn’t exactly log in to the machine, my best guess is these limits apply per instance running).
oracle soft nproc 2047 oracle hard nproc 16383 oracle soft nofile 1023 oracle hard nofile 65535
Make sure the
limits.conf is being interpreted as the
oracle user logs in by adding these lines to
/etc/pam.d/login. You will want to make sure that is actually happening, since the defaults are way lower and you may get all sorts of problems.
session required /lib/security/pam_limits.so session required pam_limits.so
Unpack and prepare the installation.
# cd /path/to/zipfile # unzip linux_11gR1b5_database.zip
(And wait… wait a bit more… go get a cup of coffee…)
After your second cup of coffee, you should have a multi-gigabyte set of files; this is our installer.
# chown -R oracle:oinstall database # chown -R oracle:oinstall /u01/app/oracle
Fire up the installer as the
oracle user itself. This is what you will probably see on the output window:
# su - oracle $ cd /path/to/extracted/zip/file $ ./runInstaller Starting Oracle Universal Installer... Checking Temp space: must be greater than 80 MB. Actual 58633 MB Passed Checking swap space: must be greater than 150 MB. Actual 2900 MB Passed Checking monitor: must be configured to display at least 256 colors. Actual 16777216 Passed Preparing to launch Oracle Universal Installer from /tmp/OraInstall2007-07-11_04-38-56PM. Please wait ... Oracle Universal Installer, Version 188.8.131.52.0 Production Copyright (C) 1999, 2007, Oracle. All rights reserved. ulimit: 1: Illegal option -u ulimit: 1: Illegal option -u rpm: To install rpm packages on Debian systems, use alien. See README.Debian. error: cannot open Packages index using db3 - No such file or directory (2) error: cannot open Packages database in /var/lib/rpm rpm: To install rpm packages on Debian systems, use alien. See README.Debian. error: cannot open Packages index using db3 - No such file or directory (2) error: cannot open Packages database in /var/lib/rpm
There are a few errors that can be safely ignored: the
ulimit and the RPM-related errors, since the limits don’t restrict the installer and since we actually don’t have a RPM database on the machine — we are running on Ubuntu, remember?
After a few moments, you will be prompted to choose where to install the Oracle server. You’ll notice that I asked the installer to not create a starter database — I did that later. Choose the Oracle Base and correct the group if needed. I personally recommend sticking with the defaults if you are a newbie like me.
As you press the Next button, you will be prompted where to install the Inventory — leave it that way unless you know what you are doing (if this were the case, you wouldn’t be reading this text anyways). Also correct the OS group name if needed and hit Next.
Since I’ve chosen to install the server in the same directory as the
HOME directory, the installer will issue a warning. I simply ignored it and continued with the installation.
After that warning, I tried to perform some prerequisite tests, and yes — some will fail. Just mark the failed boxes and hit Next (after trying a few times to fix those issues, I’ve decided to call the installer’s bluff and… it worked!)
After all this warning stuff, it’ll ask you to check the list of products to be installed. I was amazed when I read that 122 different products would be installed on my box. Hit Next.
Go get some coffee.
And some more coffee.
And even more coffee.
You may like to go to the washroom after so much time drinking coffee. Remember: I was installing on a 3 GHz machine with 1 GiB of RAM with SATA2 disks — this box is supposed be blazing fast.
At some point, it will ask you to run some commands as
root. Do that when it asks, since the install depends on a few modifications on the base system (like creating the
$ sudo -s Password: # /u01/app/oracle/oraInventory/orainstRoot.sh Changing permissions of /u01/app/oracle/oraInventory to 770. Changing groupname of /u01/app/oracle/oraInventory to oinstall. The execution of the script is complete # /u01/app/oracle/product/11.1.0/db_1/root.sh Running Oracle 11g root.sh script... The following environment variables are set as: ORACLE_OWNER= oracle ORACLE_HOME= /u01/app/oracle/product/11.1.0/db_1 [: 185: ==: unexpected operator [: 189: ==: unexpected operator Copying dbhome to /usr/local/bin ... Copying oraenv to /usr/local/bin ... Copying coraenv to /usr/local/bin ... Creating /etc/oratab file... Entries will be added to the /etc/oratab file as needed by Database Configuration Assistant when a database is created Finished running generic part of root.sh script. Now product-specific root actions will be performed. Finished product-specific root actions.
After these scripts finish their execution (the errors seem to be ignorable), hit the OK button and you’ll have a window that (probably) will look like this one:
Just hit OK to get out the installer. The basic installation is… not over yet.
To allow Oracle start on boot-up, create a file called
oracledb (or whatever name you want to call it) and put it in
/etc/init.d with the contents below. This script was copied and pasted from a tutorial by Graham Williams. It will read the
/etc/oratab and fire up any instances it finds.
#!/bin/bash # # /etc/init.d/oracledb # # Run-level Startup script for the Oracle Instance, Listener, and Web Interface export ORACLE_HOME=/u01/app/oracle export PATH=$PATH:$ORACLE_HOME/bin ORA_OWNR="oracle" # if the executables do not exist -- display error if [ ! -f $ORACLE_HOME/bin/dbstart -o ! -d $ORACLE_HOME ] then echo "Oracle startup: cannot start" exit 1 fi # depending on parameter -- startup, shutdown, restart # of the instance and listener or usage display case "$1" in start) # Oracle listener and instance startup echo -n "Starting Oracle: " su $ORA_OWNR -c "$ORACLE_HOME/bin/lsnrctl start" su $ORA_OWNR -c $ORACLE_HOME/bin/dbstart touch /var/lock/oracle su $ORA_OWNR -c "$ORACLE_HOME/bin/emctl start dbconsole" echo "OK" ;; stop) # Oracle listener and instance shutdown echo -n "Shutdown Oracle: " su $ORA_OWNR -c "$ORACLE_HOME/bin/lsnrctl stop" su $ORA_OWNR -c $ORACLE_HOME/bin/dbshut rm -f /var/lock/oracle su $ORA_OWNR -c "$ORACLE_HOME/bin/emctl stop dbconsole" echo "OK" ;; reload|restart) $0 stop $0 start ;; *) echo "Usage: `basename $0` start|stop|restart|reload" exit 1 esac exit 0
After saving the file, make it executable
# chmod a+x /etc/init.d/oracledb
and if you want, make it run at every boot:
# update-rc.d oracledb defaults 99 Adding system startup for /etc/init.d/oracledb ... /etc/rc0.d/K99oracledb -> ../init.d/oracledb /etc/rc1.d/K99oracledb -> ../init.d/oracledb /etc/rc6.d/K99oracledb -> ../init.d/oracledb /etc/rc2.d/S99oracledb -> ../init.d/oracledb /etc/rc3.d/S99oracledb -> ../init.d/oracledb /etc/rc4.d/S99oracledb -> ../init.d/oracledb /etc/rc5.d/S99oracledb -> ../init.d/oracledb
Before finishing, add the following lines to your
/etc/profile . Be careful, since these values are valid system-wide. So make sure the paths are set according to your particular setup (if you have been doing everything according to this text, you should be fine).
export ORACLE_BASE=/u01/app/oracle export ORACLE_HOME=/u01/app/oracle/product/11.1.0/db_1 export ORACLE_SID=ORCL export PATH=$PATH:/u01/app/oracle/product/11.1.0/db_1/bin
Last operation: add yourself to the
dba group. You can use
usermod or just edit the
/etc/groups file and add your username at the end of the line that starts with
dba (my username is ‘bott’):
If you chose to not create a starter database during your install, you’ll have to do two extra steps. You should create a listener (with
netca) and after that, create the starter database (also with
netca). If you chose to have the installer create a database for you, then you should be fine, since when doing that, it asks for a password for the default accounts (
SYSMAN if you choose to install it with the enterprise manager option selected).
If everything has gone well, open a terminal window and, as the
oracle user, type:
$ sqlplus SQL*Plus: Release 184.108.40.206.0 - Beta on Wed Jul 11 17:11:53 2007 Copyright (c) 1982, 2007, Oracle. All rights reserved. Enter user-name:
If you see these messages (and I sincerely hope you do) you’re all set! That means that you have finished a quite long install of Oracle 11g and you are ready to begin destroying it, just as I plan to as I take my first steps with Oracle. Some might say that going from Oracle to MySQL would make for an easier transition — I really don’t know, but I will post further entries on my experiences as I go.
Anyway, I would greatly appreciate your feedback, especially if we can improve this tutorial so that more people can benefit from it.
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