V$STANDBY_EVENT_HISTOGRAM definition in Oracle Database 11.2
V$STANDBY_EVENT_HISTOGRAM

select
  NAME,                                    -- NAME VARCHAR2(64)
  TIME,                                    -- TIME NUMBER
  UNIT,                                    -- UNIT VARCHAR2(16)
  COUNT,                                   -- COUNT NUMBER
  LAST_TIME_UPDATED                        -- LAST_TIME_UPDATED VARCHAR2(20)
FROM
  x$krdevthist

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