Active Session History

Anyone has information about Active Session History views (both V$ and
DBA)

So far I have more questions than answers how those views can be used...

I am especially interested in the wait events columns like EVENTS_ID,
TIME_WAITED, WAIT_TIME. 

What is funny enough is that EVENT_ID column is often just null in v$
view.





Thank you in advance,
Laimis N



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