About oracle_home

Hi,
I'm trying to understand something.
I have installed the oracle database 11gR2, so I have at HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\, an KeyOraDb11gHome_1 child node.. with many variables. Ok, then I have the Developer Suite 10gR2 installed, with also a child node (Key_DevSuiteHome10g) in HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\
My question is, when something is requesting the oracle_home variable, where it looks for? I have seen somewhere an ORACLE_HOME also in the Environment variables (My computer -> Properties -> Advanced -> Environment Variables).
So, why should someone manually define there, a new system variable entry of oracle home (also TNS_ADMIN, with the value ...\network\admin), pointing to the directory where database is installed, if that oracle_home is created by default in registry, when installing oracle database.. ? Is this needed?
And there was also a system variable.. ORACLE_SID, with the database sid.
So i'm just curious, what's the difference between the oracle_home from env. variable, and the oracle_home in registry?
I think there is no need to manually define other variables as environment variables.
Thanks.
Edited by: Roger25 on 12.03.2013 21:42

Roger25 wrote:
Hi,
I'm trying to understand something.
I have installed the oracle database 11gR2, so I have at HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\, an KeyOraDb11gHome_1 child node.. with many variables. Ok, then I have the Developer Suite 10gR2 installed, with also a child node (Key_DevSuiteHome10g) in HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\
My question is, when something is requesting the oracle_home variable, where it looks for? I have seen somewhere an ORACLE_HOME also in the Environment variables (My computer -> Properties -> Advanced -> Environment Variables).
So, why should someone manually define there, a new system variable entry of oracle home (also TNS_ADMIN, with the value ...\network\admin), pointing to the directory where database is installed, if that oracle_home is created by default in registry, when installing oracle database.. ? Is this needed?
And there was also a system variable.. ORACLE_SID, with the database sid.
So i'm just curious, what's the difference between the oracle_home from env. variable, and the oracle_home in registry?
I think there is no need to manually define other variables as environment variables.
Thanks.
Edited by: Roger25 on 12.03.2013 21:42Welcome to the "wonderful" world of Windows. You have just discovered one of the prime reasons I avoid Windows every chance I get -- the registry vs. session environment variables.
And lest someone accuse me of simply being a nix bigot who doesn't "get" Windows ... My career trajectory went from IBM Big Iron (sys-360 and its descendents) -> OS/2 -> Windows -> Solaris -> AIX -> HP-UX -> Oracle Linux. My first Oracle database was v7.3 on Win 3.11. If anything, I should have a bias toward* Windows .....
Edited by: EdStevens on Mar 12, 2013 3:24 PM

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My database version is 10.2.0.4.0 .
Hi,
1. Do you backup of ORACLE_HOME available..
2. Only copying emctl/emca binariews might not help you because you are not aware about other files.. Some other files/binaries may also be missing
I would suggest you restore it from backup..
>
My doubt is -- > if i copy the binary files like 'emca,emctl ' etc from standby server(10.2.0.4.0) to production server(10.2.0.4.0) will it work?
will i get the same configuration again or i need to create the OEM again?It may or may not work.. You can give it a try.. If it doesn't work either go for restoring from backup or fresh installation..
Also only binaries are missing .. it doesn't have do anything with OEM configuration.. It should work fine once you have all binaries in place.
Kind Regards
Rajesh

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