GV$REPLQUEUE

select
inst_id,                 -- INST_ID NUMBER
txns_enqueued_knstrqu,   -- TXNS_ENQUEUED NUMBER
calls_enqueued_knstrqu,  -- CALLS_ENQUEUED NUMBER
txns_purged_knstrqu,     -- TXNS_PURGED NUMBER
last_enqueue_time_knstrqu, -- LAST_ENQUEUE_TIME DATE
last_purge_time_knstrqu  -- LAST_PURGE_TIME DATE
from
x$knstrqu
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