V$LOGSTDBY_STATE definition in Oracle Database 11.2
V$LOGSTDBY_STATE
select
primary_dbid, -- PRIMARY_DBID NUMBER
session_id, -- SESSION_ID NUMBER
realtime_apply, -- REALTIME_APPLY VARCHAR2(64)
state -- STATE VARCHAR2(64)
from
gv$logstdby_state
where
inst_id = USERENV('Instance')