select
  event#,                                  -- EVENT# NUMBER
  event,                                   -- EVENT VARCHAR2(64)
  wait_time_milli,                         -- WAIT_TIME_MILLI NUMBER
  wait_count,                              -- WAIT_COUNT NUMBER
  last_update_time                         -- LAST_UPDATE_TIME VARCHAR2(64)
from
  gv$event_histogram
where
  inst_id = USERENV('Instance')