GV$FS_FAILOVER_HISTOGRAM definition in Oracle Database 11.2
GV$FS_FAILOVER_HISTOGRAM

select
  INST_ID,                                 -- INST_ID NUMBER
  REDO_LATENCY,                            -- REDO_LATENCY NUMBER
  FREQUENCY,                               -- FREQUENCY NUMBER
  LAST_TIME                                -- LAST_TIME VARCHAR2(20)
from
  x$rfahist

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