RE: ORACLE_HOME

From: <Joel.Patterson_at_crowley.com>
Date: Tue, 19 Jan 2010 08:36:38 -0500
Message-ID: <0684DA55864E404F8AD2E2EBDFD557DA03E7D544_at_JAXMSG01.crowley.com>

You might want to check Martin Bach's notes, (I havn't), but there is an order of precedence which I will not attempt to be accurate about.  

First the environment and which tnsnames.ora file is being used are two different things.

For the tnsnames.ora file the order a program would look might probably be - or close to. Remember, once the connect string is found looking for the connect string ceases.

1. The directory you started the program in. if there is one there it will be used.
2. The TNS_ADMIN system environment variable - start control panel, system, ... advanced, env var button,...
3. $ORACLE_HOME/network/admin directory -- this depends of course on what environment is set. (normally the default - which is why it is easier to run one windows DB/server).
4. (might look in path, not sure)
5. not sure of other steps.

Hope that helps, or prompts someone to elaborate more specifically.  

Joel Patterson
Database Administrator
904 727-2546

---

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Roger Xu Sent: Monday, January 18, 2010 4:28 PM
To: oracle-l_at_freelists.org
Subject: ORACLE_HOME  

As I am learning Oracle in the Windows environment, I noticed that I do not have to set ORACLE_HOME.

Am I missing something? Thanks!  

H:\>echo %ORACLE_HOME%
%ORACLE_HOME% H:\>sqlplus system/manager_at_triwebb

SQL*Plus: Release 10.1.0.4.2 - Production on Mon Jan 18 15:23:00 2010

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64
bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

H:\>set
ALLUSERSPROFILE=C:\Documents and Settings\All Users APPDATA=C:\Documents and Settings\rxu\Application Data CATALINA_HOME=C:\Tomcat5028
CLASSPATH=C:\j2sdk1.4.2_06;C:\Tomcat5028\webapps\WEB-INF\classes CLIENTNAME=BB011257
ClusterLog=C:\WINDOWS\Cluster\cluster.log CommonProgramFiles=C:\Program Files\Common Files COMPUTERNAME=DRAGON
ComSpec=C:\WINDOWS\system32\cmd.exe
FP_NO_HOST_CHECK=NO
HOMEDRIVE=H:
HOMEPATH=\
HOMESHARE=\\cbcsrv1\users$\rxu
JAVA_HOME=C:\j2sdk1.4.2_06
LOGONSERVER=\\CBCADC2
NUMBER_OF_PROCESSORS=8
OS=Windows_NT
Path=E:\OraIAS\jdk\jre\bin\classic;E:\OraIAS\jdk\jre\bin;E:\OraIAS\bin;E :\OraIAS
\jlib;E:\OraPortal\bin;E:\OraPortal\jlib;D:\oracle\product\10.2.0\db_1\b

in;C:\WI
NDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program
Files\Dell\SysMgt\

RAC5;C:\Program Files\Dell\SysMgt\oma\bin;%OMPATH%;C:\j2sdk1.4.2_06\bin PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH

PROCESSOR_ARCHITECTURE=x86
PROCESSOR_IDENTIFIER=x86 Family 6 Model 15 Stepping 11, GenuineIntel
PROCESSOR_LEVEL=6
PROCESSOR_REVISION=0f0b

ProgramFiles=C:\Program Files
PROMPT=$P$G
SESSIONNAME=RDP-Tcp#129
SystemDrive=C:
SystemRoot=C:\WINDOWS
TEMP=C:\DOCUME~1\rxu\LOCALS~1\Temp\1
TMP=C:\DOCUME~1\rxu\LOCALS~1\Temp\1
USERDNSDOMAIN=CARTERBC.NET
USERDOMAIN=CARTERBC
USERNAME=rxu
USERPROFILE=C:\Documents and Settings\rxu windir=C:\WINDOWS

H:\>      

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Received on Tue Jan 19 2010 - 07:36:38 CST