The admin who, sqm command provides information about the state of stable queues. In a warm standby application, the inbound queue is read by the Distributor thread, if you have not disabled it, and by the standby DSI thread. Replication Server cannot delete messages from the inbound queue until both threads have read and delivered them.
If Replication Server is not deleting messages from the inbound queue, you can use the admin who, sqm command to investigate the problem. The command tells you how many threads are reading the queue and the minimum deletion point in the queue.
