GV$BLOCKING_QUIESCE definition in Oracle Database 11.2
GV$BLOCKING_QUIESCE

select
  inst_id,                                 -- INST_ID NUMBER
  sid_kgskvft                              -- SID NUMBER
from
  x$kgskvft
where
  active_kgskvft = 1 and cg_name_kgskvft <> 'SYS_GROUP' and cg_name_kgskvft <> '_ORACLE_BACKGROUND_GROUP_'

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