Question on Oratab file when installing two Oracle instances in one machine

OS: AIX 5.3
DB version:10.2.0.1.0
I already have an instance of version 9.2 which is very important and which we don't want to upgrade and we wanted another test(unimportant) oracle instance called testdb_10gR2 of version 10.2.0.1.0 on the same machine.
So i installed 10.2.0.1.0 on a different ORACLE_HOME .Installation of the new 10.2.0.1.0 (testdb_10gR2) went ahead successfully and at the last step i have to log in as root and execute root.sh
I entered 'n' for the options "dbhome", "oraenv", "coraenv" as shown below so that the settings for our 9.2 instance (which is very important) will remain intact.
What would have happened if i entered 'y' ie. Overwrite ?
The following environment variables are set as:
ORACLE_OWNER= oracle
ORACLE_HOME= /u04/testdb_10gR2_Feb2009
Enter the full pathname of the local bin directory: [/usr/local/bin]: /usr/local/bin
The file "dbhome" already exists in /usr/local/bin. Overwrite it? (y/n) [n]: n
The file "oraenv" already exists in /usr/local/bin. Overwrite it? (y/n) [n]: n
The file "coraenv" already exists in /usr/local/bin. Overwrite it? (y/n) [n]: n
Entries will be added to the /etc/oratab file as needed by
Database Configuration Assistant when a database is created
Finished running generic part of root.sh script.
Now product-specific root actions will be performed.
During installEdited by: Citizen_2 on Jan 30, 2009 5:05 AM

'dbhome','oraenv','coraenv' are sripts used to set a proper environment (see the descriptions at the beginning of these scripts). These scripts rely on oratab (they check for existing SIDs), but answering 'Y' does not mean you will modifiy an existing oratab.
I think these scripts change rarely, so it's very likely overwriting the existing 9i scripts with the 10g scripts changes nothing. To be honest I don't use the scripts , so in my case 'Y' or 'N' doesn't matter. But important is you don't have to worry about 'oratab'.
Werner

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