Oracle 12c installation

oracle

I have Oracle 11g installed on my system and want to install 12c now. Read articles (Oracle docs and general) which suggest that I can do so in different homes. But, when I try to install 12c (12.1.0.1 release 1), it does not allow me to do so as it says "oracle _home (in environment variables) already defined and does not match the path specified (during installation)".
A search on this portal gives results that do not answer my query.

What path should I specify for software location (Oracle home) during installation? (It auto reflects the server path of 11g installed)
Do I need to manually add this specified path to Oracle_Home path (in addition to the already existing oracle home for 11g) in environment variables for the installation to auto-accept it and allow further installation?

How do I get around the installation?

Best Answer

Docs don't just "suggest" that you "can" install into a new location. It is required. Two different installations must be in their own ORACLE_HOME directories. And you do not "add" another path/directory to ORACLE_HOME. ORACLE_HOME specifies only one home/directory at a time.

To quote from the Installation Guide (emphasis mine):

"Do not install Oracle Database 12c software into an existing Oracle home."

Also, the installation guide specifically says to unset ORACLE_HOME and several other environment variables before launching the OUI.

If you have had an existing installation on your system, and you are using the same user account to install this installation, then unset the ORACLE_HOME, ORACLE_BASE, ORACLE_SID, TNS_ADMIN environment variables and any other environment variable set for the Oracle installation user that is connected with Oracle software homes.

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Just guesswork, but do you select "Upgrade an existing database" early on:

upgrade

and "advanced install" later on:

enter image description here

The docs do look as if they are referring to the 10g installer.

Oracle 12c on Ubuntu 12.04

To check if database or listener is running on Linux, you could check if Oracle processes are running, for example ps aux | grep pmon(or grep lsnr for listener). Pmon is process monitor, process responsible for "housekeeping", like freeing buffer cache or some resources that are not in use anymore. It is always running if the instance is up ( but this process does not guarantee that you can connect, because the database could be started in mount mode, anyway it is a start of a troubleshooting ).

It seems that you didn't set ORACLE_SID, ORACLE_BASE, ORACLE_HOME and PATH variables. On link that you provided, environment variables are set at the runtime. You could permanently set them in your .bashrc or bash_profile file.

Add these lines to your .bashrc file(it is in your users home directory, for example /home/oracle/.bashrc).

ORACLE_SID=name_of_your_database

ORACLE_BASE=/oracle/base/

ORACLE_HOME=/oracle/base/dbhome_1

PATH=$PATH:$HOME/bin:$ORACLE_HOME/bin

export ORACLE_SID ORACLE_BASE ORACLE_HOME PATH

Reload new bash profile with command - source .bashrc and try again and read Oracle installation documentation for more detalis.

However, since Ubuntu is not supported OS for Oracle, there is no way to know for sure what the problem really is or was. If installation is for learning purpose, easier for you will be to install some supported OS in a VirtualBox for example, or to use Oracle prebuild VMs.

Best Answer

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Oracle 12c on Ubuntu 12.04

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