How many Instances can I install on one machine?

Hi Folks,
Do you know how many oracle instances I can install on my Win OS machine.
I already have three different instances. Typically how many instances Oracle recommends to setup in one machine to ensure performance improvement?
I use Oracle 9 and oracle10g both. In fact, Oracle9 in Solaris and oracle10g on win.
Regards,
Amir

In general, it recommends one instance per server
in a production environment, for a variety of
reasons (maintainability, backup/recovery, easier to
tune, better use of resources).If you have 100 productives databases, it is very probable that you won't be able to have one server per database.
Again, it depends on your number of users, processors and ram... But if you 16G ram and 16 processors, you should well be able to able to have 20 databases with not too much activity.
The number of 20 here means truely nothing. I admit. But recommending one instance per server is not ok.
Many applications require to have a separate database. It is the double administration necessary, but it is better than the troubles generated when 2 software vendors are sharing the same db.
For development, I have some systems with over 50 instances running with 16g ram and 8 cpus.

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