GV$GLOBAL_BLOCKED_LOCKS definition in Oracle Database 11.2
GV$GLOBAL_BLOCKED_LOCKS

select
  USERENV('instance'),                     -- INST_ID NUMBER
  addr,                                    -- ADDR RAW(8)
  kaddr,                                   -- KADDR RAW(8)
  sid,                                     -- SID NUMBER
  type,                                    -- TYPE VARCHAR2(2)
  id1,                                     -- ID1 NUMBER
  id2,                                     -- ID2 NUMBER
  lmode,                                   -- LMODE NUMBER
  request,                                 -- REQUEST NUMBER
  ctime                                    -- CTIME NUMBER
from
  v$lock l
where
  exists (
  select
    *
  from
    v$dlm_locks d
  where
    substr(d.resource_name2,1,instr(d.resource_name2, ',',1,1)-1) = id1 and substr(d.resource_name2,instr(d.resource_name2,',',1,1)+1, instr(d.resource_name2 , ',',1,2)-instr(d.resource_name2, ',',1,1)-1) = id2 and substr(d.resource_name2,instr(d.resource_name2, ',',-1,1)+1,2) = type)

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