Why do we actuallya need the setting of environment variables?

Hello guys,
I read that, in order to connect to the database via SQL*Plus, we need to have the environment variables set. So, SQL*Plus is a command tool, which doesnt know over which path to connect to db, if the environment variables are not set?
How about the needs of setting environment variables at point of view of MS-DOS? I know that over MS-DOS we can check if the environment variables are already set or not. Or we can actively set the environment variables.
When should we actually set the environment variables? Before we run the GUI or after? I read, that if we set it before we run the GUI, then the setting will be taken over when it comes to that step by running GUI. I am curious, since this would be interesting to know, if we use other version than XE.
Thanks..

Oracle's flexibility ... many different versions working the same on many different versions of many different operating systems ... means that a single consistent installation and configuration methodology must work everywhere so as not to have the limitations of other competing products that work on only a single operating system or require that one learn a different syntax and methods for different versions.
Be grateful Oracle is as it is. Your competence in one version and operating system translates into competence in others.

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Hi All,
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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.
And one more thing system variables will be applicable for all servers(the whole machine) right.It may spoil the installation of new servers and present servers as variables should be unique to each server.
    I want to install weblogic and SOA server installation.
So Can I remove the existing system variables(as they will applicable for every server) and install weblogic and SOA server installation without setting up the environment variables?
Especially I have multiple Weblogic servers,In that case how it would be to have environment variables(JAVA_HOME,WL_HOME,ORACLE_HOME etc)?
Please guide me on this to installl SOA suite .
Thanks in advance

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Hi
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Pravin wrote:
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hi
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Edited by: csphard on Apr 14, 2010 5:17 PM
Edited by: csphard on Apr 14, 2010 5:22 PM
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Hi,
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Cheers

Setting Oracle environment variable using batch (.bat) file in windows

Hi,
Oracle 9i db
Windows OS
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With Regards

Hi,
*@echo off*
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===================
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===================
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how to set env. variables permanently using the DOS commands. ?
With Regards

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Hello Experts
I'm having problem when I try to run my Enterprise Manager. Listner start normaly but then I tries to start the database I got the following message.
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Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
http://linux-f4y3.site:1158/em/console/aboutApplication
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/apps/oracle/product/10.2.0/db_1/linux-f4y3.site_orcl/sysman/config/emd.properties
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The dbconsole cannot run with this mismatch.
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To me looks like I need to fix the timezone on my machine but I don't know how. Can please somebody shows me the steps how to achieve this task?
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I believe this issue is occurring because timezone info between the OS and oracle is out of synch - possibly because timezone patches have been applied to the OS or oracle, but not both. It is always good practice to apply such patches to both OS and Oracle.
Pl see these MOS Docs
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362888.1 - Problem: Startup Agent: EM Agent will not start due to Timezone mismatch (Daylight Savings changes for Australia)
549079.1 - Troubleshooting Database Control Startup Issues
HTH
Srini

Setting windows environment variables from Java program

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I need to decrypt an encrypted Oracle user password in a batch file which will be used while running a sql script with sqlplus. I was planning to have bat file which will call a Java program decrypt the password and set it as an env variable in windows which will be available while calling sqlplus.
thanks

Runtime.exec has a lot of overloadings. Two of them
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its arguments.
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public static void main (String[] args) throws Exception {
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thanks

Why do we actuallya need the setting of environment variables?

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