Stops message delivery in this session, and restarts message delivery with the oldest unacknowledged message.
All consumers deliver messages in a serial order. Acknowledging a received message automatically acknowledges all messages that have been delivered to the client.
Restarting a session causes it to take the following actions:
Stop message delivery
Mark all messages that might have been delivered but not acknowledged as "redelivered"
Restart the delivery sequence including all unacknowledged messages that had been previously delivered. Redelivered messages do not have to be delivered in exactly their original delivery order.