Stores for Delivery Assurance

Delivery Assurance: Topology
When using a persistence store for delivery assurance, the store is similar to a second transport. Like the direct path, it mediates message communication among a network of endpoints. It operates in parallel with direct-path transports, as an additional path from publishers to subscribers.
Delivery Assurance: Retention and Delivery
A persistence store adds value by strengthening message delivery assurances. You could imagine a persistence store as a bus that can retain its message stream for subscribers that are temporarily unavailable.
Delivery Assurance: Larger Networks of Endpoints
Persistence stores connect endpoints to endpoints.
Delivery Assurance: Multiple Stores
A persistence store can serve as a redundant message path for exactly one combined message stream. When a suite of application programs communicate using two or more disjoint message streams, use a separate store to back each of the message streams.
Delivery Assurance: Durable Collision
Each standard durable can serve at most one durable subscriber object at a time. The persistence store resolves collisions in favor of the most recent durable subscriber.