OSDBA & OSOPER Groups on Unix/Linux
The 'OSDBA' and 'OSOPER' groups are chosen at installation time and usually both default to the group 'dba'. These groups are compiled into the 'oracle' executable and so are the same for all databases running from a given ORACLE_HOME directory. The actual groups being used for OSDBA and OSOPER can be checked thus:

cd $ORACLE_HOME/rdbms/lib
cat config.[cs]

The line '#define SS_DBA_GRP "group"' should name the chosen OSDBA group.
The line '#define SS_OPER_GRP "group"' should name the chosen OSOPER group.

If you wish to change the OSDBA or OSOPER groups this file needs to be modified either directly or using the installer.

Eg: For an OSDBA group of 'mygroup'

If your platform has config.c (this is the case for HP-UX, Compaq Tru64
Unixware and Linux):

Change: #define SS_DBA_GRP "dba"
to: #define SS_DBA_GRP "mygroup"

If your platform has config.s:
Due to the way different compilers under different architectures generate
assembler code, it's not possible to give a universal rule.

Here are some examples:
Sun SPARC Solaris:
Change both ocurrences of
.ascii "dba\0"
.ascii "mygroup\0"

IBM AIX/Intel Solaris:
Change both ocurrences of
.string "dba"
.string "mygroup"

To effect any changes to the groups and to be sure you are using the groups defined in this file relink the Oracle executable.Be sure to shutdown all databases before relinking:

mv config.o config.o.orig
make -f ins_rdbms.mk ioracle

(Note config.o will be re-created by make because of dependencies automatically)

For a group to be accepted by Oracle as the OSDBA or OSOPER group it must:

- Be compiled into the Oracle executable
- The group name must exist in /etc/group (or in 'ypcat group' if NIS is being used)
- It CANNOT be the group called 'daemon'

Note: The commands above are examples and may vary between platforms.
Note: Some Oracle documentation refers to the ability to define OSDBA and OSOPER roles using group names of the form 'ORA_sid_OSDBA'.
This functionality has not been implemented on Unix (See Bug 224071)

DOAG 2016

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