Running 8i and 10g on same UNIX server

Greetings,
I am a developer playing DBA, so please forgive me if these are elementary questions. I have no DBA support.
I have a Solaris 8 server currently running operational software using 8i. My requirement is to load and test 64bit 10g without interfering with the operational system, then test the s/w. Later, I need to switch from 8i to 10g with little or (preferably) no downtime. It would be nice run the two in parallel before the switchover.
I have a duplicate setup in the development lab, which is what I am working on right now.
I was able to get 10g loaded without any apparent problems. However, when I try to run 8i and 10g, the listeners conflict.
After reading through various forums this morning, I have a few questions that I am hoping someone can answer.
1. Oracle 8i is owned by user oracle. I loaded 10g as user ora10g. Should I have loaded 10g as user oracle? If so, how do I keep it from overwriting critical 8i files that are in /usr/local/bin, etc?
2. Oracle 8is ORACLE_HOME is /usr/opt/oracle. 10gs is /export/ora10g. Does 10g need to be in /usr/opt/ora10g? If so, can I set up a link to simulate this, or do I need to reload?
Thanks in advance,
Linda

Won't say much about the platform (solaris) aspect here but anyway...
1. You could and sometimes should have a different oracle software owner user for installing/managing software, either is ok. You also might want a different group to own the oraInventory (software catalog).
You can always enter somethng other than default when prompted by root.sh - why not e.g. /home/ora10g/bin?
2. I dont think it needs to be installed anywhere, but /export is a bit unusual isn't it? Used for nfs etc.

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>
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Message was edited by:
user617980
Message was edited by:
user617980

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oracle   28694 17439 0 17:49 pts/0    00:00:00 grep tnsYou can choose for a "more than one listener" solution or "only one listener". Whatever you do the unix user that starts the oracle, listener executables have to be the same OR sicky bits have to exist on the executables (so the user is allowed to start the executables and access the memory realms as if it was the actual owner).
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HTH
M.
Edited by: Marco Gralike on Jun 8, 2009 6:01 PM

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