V$HVMASTER_INFO definition in Oracle Database 11.2
V$HVMASTER_INFO

select
  HV_ID,                                   -- HV_ID NUMBER
  CURRENT_MASTER,                          -- CURRENT_MASTER NUMBER
  PREVIOUS_MASTER,                         -- PREVIOUS_MASTER NUMBER
  REMASTER_CNT                             -- REMASTER_CNT NUMBER
from
  GV$HVMASTER_INFO
where
  inst_id = USERENV('Instance')

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