Which events can be set, where's their output

Hi

Until recently, I was unaware of 'ALTER SESSION SET EVENTS='$number $foo'. Searching oracle doc didn't help me much; the only thing I found was:

'EVENT is a parameter used only to debug the system. Do not alter the value
of this parameter except at the direction of Oracle technical support personnel. '

Asking google, I found many examples, but no list of which events can be set, what their exact syntax is, and how they would affect the database.

Any help as always very appreciated

Rene    

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