Finding Oracle Home

September 6th, 2013

business vision

Once in while I work on systems that are new to me and no one is around to explain the configuration to me. I can see databases running and their SIDs via the process names, but when there are multiple ORACLE_HOME directories possible it can be difficult to even connect to these databases because connecting locally requires the SID and ORACLE_HOME. In these cases, I’ve often wanted a way to clearly figure out which running database is using which ORACLE_HOME, so it was fun to see Tanel Poder’s recent posted on how to do this on LINUX and SOLARIS. Here is a quick summary of LINUX and SOLARIS plus HPUX and AIX as well:

Solaris and Linux

$ pgrep  -lf _pmon_
12586 ora_pmon_ee10204

ORACLE_SID is ee10204

$ pwdx 12586
12586: /u01/oracle/

ORACLE_HOME is /u01/oracle/
$ ps -ef | grep pmon
ora1024 25611     1  0  Mar 21  ?         0:24 ora_pmon_itanic10

ORACLE_SID is itanic10

$ pfiles 25611 | grep  bin
25611:                  /opt/ora1024/app/db_1/bin/oracle

ORACLE_HOME is /opt/ora1024/app/db_1


$ ps -ef | grep pmon
ora1024   262314        1   0   Mar 23      -  0:12 ora_pmon_mercury

ORACLE_SID is mercury

$ ls -l /proc/262314/cwd
lr-x------   2 ora1024  dba  0 Mar 23 19:31 cwd -> /data/opt/app/product/

ORACLE_HOME is /data/opt/app/product/



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  2. khailey
    September 6th, 2013 at 15:13 | #1

    Nice trick from Wissem El Khlifi ‏@orawiss on twitter:
    @kylehhailey thanks Kyle for sharing:) you can also use dbms_system.get_env(‘ORACLE_HOME’, :OHM) ; from the DB

    SQL > var OH varchar2(200);
    SQL > EXEC dbms_system.get_env(‘ORACLE_HOME’, :OH) ;

  3. Francois G
    September 8th, 2013 at 14:50 | #2

    This is hoppefully far more simple on windows system since you just have to check the regedit.

  4. September 8th, 2013 at 15:54 | #3

    Hello Kyle,

    AFAIK, under AIX there are proc tools too (although there seems to be a little less tools than on Solaris). In this case, I think you can use the procwdx command on AIX to act the very same way as pwdx on Solaris does.

    Best regards,
    Julien Gabel.

  5. Per Johnsson
    December 5th, 2013 at 10:41 | #4


    Very good article. I have a suggestion an addition and a question:
    On Linux I use the same method as you do on AIX

    ls -l /proc/$PID/cwd

    I do this since not all Linuxes have pwdx.

    You can do this for windows also:
    wmic process where name=’oracle.exe’ get commandline
    c:\oracle\product\11.2.0\dbhome_1\bin\ORACLE.EXE ORCL


    For HP-UX I see that you use pfiles. I think this is new for HP-UX 11i v3. Is it possible to do the same on older HP-UX releases?

    Best regards,


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