GV$BUFFERED_QUEUES

select
inst_id,                 -- INST_ID NUMBER
queue_id,                -- QUEUE_ID NUMBER
queue_schema,            -- QUEUE_SCHEMA VARCHAR2(30)
queue_name,              -- QUEUE_NAME VARCHAR2(30)
startup_time,            -- STARTUP_TIME DATE
num_msgs,                -- NUM_MSGS NUMBER
spill_msgs,              -- SPILL_MSGS NUMBER
cnum_msgs,               -- CNUM_MSGS NUMBER
cspill_msgs              -- CSPILL_MSGS NUMBER
from
x$buffered_queues
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