V$GCSHVMASTER_INFO definition in Oracle Database 11.2
V$GCSHVMASTER_INFO
select
HV_ID, -- HV_ID NUMBER
CURRENT_MASTER, -- CURRENT_MASTER NUMBER
PREVIOUS_MASTER, -- PREVIOUS_MASTER NUMBER
REMASTER_CNT -- REMASTER_CNT NUMBER
from
GV$GCSHVMASTER_INFO
where
inst_id = USERENV('Instance')