Issue with .profile for oracle 9i and 10g

Question

Here I have six oracle 9i databases on one box. I am going to upgrade five of them to oracle 10g and want to keep one database RCAT in oracle 9i for one or two week.
So, when I do upgrade I have to setup oracle home for 10g and also profile for oracle user for 10g (correct me if I m wrong). But now I want one database RCAT on oracle 9i. How can I take care of this.
I mean how I will handle profile and all other thing for oracle 9i and 10g at the same time.
Thanks,
Vishal

Answer 1

Install 10g under the same OS user as 9i, of course on a different Oracle Home. Then you configure your .profile consequently. Just as an example, this is my .bash_profile with 10g and 11g with the same oracle OS user :
[oracle@linux5 ~]$ cat .bash_profile
# .bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi
export EDITOR=vi
export ORACLE_BASE=/home/oracle/base
umask 022
o10()
{       export ORACLE_SID=db102
        export ORACLE_HOME=$ORACLE_BASE/OraHome10
        export LD_LIBRARY_PATH=$ORACLE_HOME/lib
        export PATH=$ORACLE_HOME/bin:/bin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/X11R6/bin
        export TNS_ADMIN=$ORACLE_BASE/OraHome11/network/admin
        export PS1='[\u@\h_10 \W]\$ '
o11()
{       export ORACLE_SID=db11
        export ORACLE_HOME=$ORACLE_BASE/OraHome11
        export LD_LIBRARY_PATH=$ORACLE_HOME/lib
        export PATH=$ORACLE_HOME/bin:/bin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/X11R6/bin
        export PS1='[\u@\h_11 \W]\$ '
s()
{       sqlplus / as sysdba
asm()
{       export ORACLE_SID=+ASM
db10()
{       export ORACLE_SID=db102
db11()
{       export ORACLE_SID=db11
asm10()
{       export ORACLE_SID=asm10
[oracle@linux5 ~]$