Wait time per event

— Display time waited for each wait class.
SELECT a.wait_class, sum(b.time_waited)/1000000 time_waited
FROM v$event_name a
JOIN v$system_event b ON a.name = b.event
GROUP BY a.wait_class;

WAIT_CLASS TIME_WAITED
————————— ———–
Application .013388
Commit .003503
Concurrency .009891
Configuration .003489
Idle 232.470445
Network .000432
Other .025698
System I/O .095651
User I/O .109552

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