alter session set events ‘trace[sql_mon.*] memory=high’;

will trace in-memory SQL_MONITOR component ( target ) and all sub component at level high.
There are different targets that you can use.I already posted some of them.Others I intentionally left out ( dangers etc ).

I did not have a chance to play much with all of these events options because there is so many of them.
It took me long time just to post a correct syntax.That’s how big event syntax is.And I am not finished yet.More to come.

Best way would be to run these command with different levels and see the difference.
I will do it when I get some free time.

Thanks,

Miladin