Env variable confusion - newbie install

Hello,
I have completed the installation sequence for db 10g (10.2.0.1) on RHEL 4.3 (x86_64). I am somewhat confused by this installation procedure wrt env. variables such as ORACLE_HOME, ORACLE_SID, ORACLE_BASE, etc.
The pre-installation guidelines are clear in saying that .bash_profile (in this case) for user 'oracle' should NOT set these variables prior to installation:
8. If the ORACLE_SID, ORACLE_HOME, or ORACLE_BASE environment variable is set
in the file, then remove the corresponding lines from the file. (Preinstallation Tasks 2-41)
User 'oracle's .bash_profile does not get updated during installation; subsequent login as 'oracle' shows that the env. variables are not set via other means. Is there a post-installation step I'm missing?
Thank you again,
Scott

oraenv uses the ORACLE_SID to set the ORACLE_HOME and PATH - including making sure the ORACLE_HOME/bin is unique in the PATH
But ... unless there is a database instance involved, ORACLE_SID is meaningless. It really does not have meaning until dbca is used to create a database, or the manual counterpart to dbca is invoked and oratab is updated.
I have found there is a Catch-22 related to the oratab/oraenv which seems to have caused oraenv to be undervalued.
However, due to the possibility of several ORACLE_HOMEs and several databases, since Oracle7 I have used the following sequence in my .profile
export PATH=$PATH:/usr/local/bin # if not already done
export ORAENV_ASK=NO
ORACLE_SID=orcl
. orenv
export ORAENV_ASK=
and then I am able to source /usr/local/bin/oraenv on demand to set te SID, HOME and PATH for any database.
It's so useful, I add entries for each ORACLE_HOME into the oratab, regardless of whether it represents a database or not. For example, I will have entries for GridAgent, OMS, and so on.
I can not explain why the oraenv is not better discussed in the documentation. It misses a major 'feature'.

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Hi All,
   I already have two weblogic application servers on my machine(that were installed by others).
I observed some environment variables were also set in System variables(ORACLE_HOME,WEB_SERVER_HOME etc) section in Env variables section(Start Menu---> Computer --> properties ---).But why do we need to have system environment variables wherein we already have those variables in files like setDomainEnv.bat or/and setSOADoaminEnv.bat for each server.
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Especially I have multiple Weblogic servers,In that case how it would be to have environment variables(JAVA_HOME,WL_HOME,ORACLE_HOME etc)?
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user5716448 wrote:
Hi,
We have an issue whereby we want the PATH to be dyanmic with respect to the ORACLE_HOME.
Have implemented the solution in 'ORA-12557: TNS:Protocol Adapter Not Loadable' While Running OUI [ID 735400.1 but not working.
We have Windows 2008 R2 server with Oracle 11.2.0.3 client installed.
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Have changed system env variable PATH to have %ORACLE_HOME%\bin; at very start
when do PATH to check value shows
literally as %ORACLE_HOME%\bin at start rather than translating to the real physical location as it does with other logical variables.
How can we ensure translates the ORACLE_HOME correctly so PATH is O.K.
open Command Window & issue command belowecho %ORACLE_HOME%COPY the results, then PASTE all back here

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Tippu wrote:
Hi,
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