GV$CALLTAG definition in Oracle Database 11.2
GV$CALLTAG
select
w.inst_id, -- INST_ID NUMBER
w.kywmnfnum, -- SESSION_ID NUMBER
w.kywmnfpc, -- PERFORMANCE_CLASS VARCHAR2(32)
w.kywmnfwrc, -- WORK_REQUEST_CLASS VARCHAR2(32)
decode( -- HOP_COUNT NUMBER
bitand(w.kywmnfflg,1), 0, 0, 1),
decode( -- PC_UNKNOWN NUMBER
bitand(w.kywmnfflg,2), 0, 0, 1),
s.service_name, -- SERVICE_NAME VARCHAR2(64)
s.module, -- MODULE VARCHAR2(48)
s.action, -- ACTION VARCHAR2(32)
s.username, -- USERNAME VARCHAR2(30)
s.program -- PROGRAM VARCHAR2(64)
from
x$kywmnf w,
v$session s
where
w.kywmnfnum = s.sid