Which is better?    Two Oracle user in one instance OR  in two instances?

Which is better?
I could not find any benchmark for number of instances per user
in the same machine.
suppose that you have two major Oracle user, from performance
point of view it is better to make separate instances in same
machine or keep these two users in the same instance.

Hi.
I understand that you will use oracle for two different
applications on the same host.
Each instance has its SGA and background processes. So, using
two different schemas(users) in one instance you can share
phisical memory between the applications. Concerning background
processes, you can start as many of them as you wish, so it's
not a problem. If you decided that one DBW is not enough, you
could configure oracle to use two or more.
best regards,
Andrew

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