What is the order in which messages are dequeued if many messages are enqueued in the same second?
When the enq_time is the same for messages, there is another field called step_no that will be monotonically increasing (for each message that has the same enq_time). Hence this helps in maintaining the order of the messages. There will be no situation when both enq_time and step_no are the same for more than one message enqueued from the same session.
