Oracle RAC Binaries installation - Basic Qs

Folks

CASE 1 Qs 1 If "oinstall" is the primary group of the Oracle Owner i.e. all the 10gR2 Oracle software binaries are owned by "oinstall" group, then what is the use of the "dba" group in RAC?

Qs 2 Is "dba" a reserved word and does any Unix user belonging to this group automatically have "DBA" role grants/privileges in 10gR2 / Solaris 10?

Qs 3 Is it advisable to use "oinstall" as the primary group of the ORACLE Owner in place of "dba" as advised in the Oracle Manuals for 10g RAC setup?

From the Oracle Manual:-

To create the oracle user, enter a command similar to the following:

# /usr/sbin/useradd -u 200 -g oinstall -G dba[,oper] oracle

In the preceding command:

• The -u option specifies the user ID. Using this command flag is optional, as you can allow the system to provide you with an automatically generated user ID number. However, you must make note of the oracle user ID number, as you require it later during pre-installation.
• The -g option specifies the primary group, which must be the Oracle Inventory group--for example, oinstall
• The -G option specifies the secondary groups, which must include the OSDBA group, and, if required, the OSOPER group. For example: dba, or dba,oper

CASE 2 Qs 1 - If Oracle 10gR2 Binaries (NON-RAC type installation) already exists on the Machine, in Order to do a NEW RAC setup using the Same machine as 1 of the nodes, is it advisable to again install respective RAC type Oracle 10gR2 Binaries into another ORACLE_HOME path?

If YES, should any changes me made to the /var/opt/oracle/oraInst.loc file to prevent the NEW Oracle RAC Binaries installation from knowing about the previous NON-RAC Oracle installation?

/var/opt/oracle/oraInst.loc Contents:-

inventory_loc=/oracle/ora10gr2/oraInventory

inst_group=dba

Thanks indeed

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