How much performance is impacted if the Stored outline is used globally?

Hi,
One of the queries that we are having problem with and we are trying to use the Stored outline so that we freeze the execution plan. The vendor is telling us that it should set globally (ALTER SYSTEM not SESSION) , but we disagreed because this would have negative effect on our db performance. We ask to enable session only iusing LOGON trigger filtered by program/username nstead of system like below
Vendor preference: ALTER SYSTEM SET CREATE_STORED_OUTLINES=TRUE
We prefer: ALTER SESSION SET CREATE_STORED_OUTLINES=TRUE
BTW, we are on HP UX 10.2.0.3. Any recommendations or suggestions would be greatly appreciated. Thank you so much.
Rich.

No Oracle version number.
No information as to the vendor or the product.
No information indicating why a stored outline might be of value in one or many cases.
And most importantly ... no evidence of testing to see if it really makes things better or worse.
Throw this into a test environment and validate your prejudices. There is no way we can possibly
know and there are no general rules when it comes to tuning other than the fact that only testing
on your hardware with your system has value.

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