Message delivery mode

XMS supports two modes of message delivery.

Persistent messages are delivered once. A messaging server takes special precautions, such as logging the messages, to ensure that persistent messages are not lost in transit, even in the event of a failure.
Nonpersistent messages are delivered no more than once. Nonpersistent messages are less reliable than persistent messages because they can be lost in transit in the event of a failure.

The choice of delivery mode is a trade-off between reliability and performance. Nonpersistent messages are typically transported more quickly than persistent messages.