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Underscore parameters, like the two you mention, should only be set under the guidance of Oracle Support, else you risk corrupting your database beyond repair.
Status Level: Newbie (5)
Registered: Jul 23, 2011
Total Posts: 47
Total Questions: 20 (16 unresolved)
why do you waste time here when you rarely get answers to your questions?
Why you want to use them in the first place? They are undocumented parameters which means the usage of theirs is only valid when Oracle Support is going to ask you to use them.
is it very important ?
i had get the answers of all my questions from here.